Volvo TSI User manual

Foreword
The descriptions and service procedures contained in this manual are based on de-
signs and methods studies carried out up to June 2001.
The products are under continuous development. Vehicles and components produced
after the above date may therefore have different specifications and repair methods.
When this is believed to have a significant bearing on this manual, supplementary ser-
vice bulletins will be issued to cover the changes.
The new edition of this manual will update the changes.
In service procedures where the title incorporates an operation number,this is arefer-
ence to an S.R.T. (Standard Repair Time).
Service procedures which do not include an operation number in the title are for gen-
eral information and no reference is made to an S.R.T.
The following levels of observations, cautions and warnings are used in this Service
Documentation:
Note: Indicates a procedure, practice, or condition that must be followed in order to
have the vehicle or component function in the manner intended.
Caution: Indicates an unsafe practice where damage to the product could occur.
Warning: Indicates an unsafe practice where personal injury or severe damage to the
product could occur.
Danger: Indicates an unsafe practice where serious personal injury or death could oc-
cur.
Volvo Trucks North America, Inc.
Greensboro, NC USA
Order number: PV776-144528
©2001 VolvoTrucks North America, Inc., Greensboro,NC USA
All rights reserved. No part of this publication may be reproduced, stored in
retrieval system, or transmitted in any forms by any means, electronic, me-
chanical, photocopying, recording or otherwise, without the prior written
permission of VolvoTrucks North America, Inc.

Contents
General .................................................................................................... 7
Vehicle Management System ................................................................ 7
Engine Control System Glossary........................................................ 8
Specifications ....................................................................................... 10
Description of Signals .......................................................................... 10
EECU (D7C) and Breakout BoxConnected in Series Between
EECU and Wiring Harness ............................................................... 10
EECU,D7C,with Breakout BoxConnected to Wiring Harness Only 13
EECU (D12B and D12C), Breakout BoxConnected in Series Be-
tween EECU and Wiring Harness ..................................................... 16
EECU (D12B and D12C), Breakout BoxConnected to Wiring
Harness Only ..................................................................................... 19
Pinouts ................................................................................................. 22
Engine Electronic Control Unit (EECU) ............................................ 22
Pinouts ................................................................................................. 26
Vehicle Electronic Control Unit(VECU) ............................................. 26
Schematic ............................................................................................ 28
D12B .................................................................................................. 28
Schematic ............................................................................................ 29
D12C ................................................................................................. 29
Schematic ............................................................................................ 30
D7C ................................................................................................... 30
Schematic ............................................................................................ 31
VECU ................................................................................................. 31
Tools ...................................................................................................... 33
Special Tools ....................................................................................... 33
Other Special Equipment .................................................................... 35
Design and Function ........................................................................... 37
Vehicle Management System .............................................................. 37
Strategy ............................................................................................. 37
Conventional Control Systems .......................................................... 37
Data Link System .............................................................................. 38
Data Links,Design and Function ...................................................... 39
Diagnostic Connector ........................................................................ 47
Communication Equipment ............................................................... 48
Instrument Cluster ............................................................................. 49
Vehicle Electronic Control Unit (VECU) ............................................ 50
Engine Electronic Control Unit .......................................................... 51
ABS BrakeSystem ECU ................................................................... 63
SRS Airbag ECU ............................................................................... 64
Transmission ECU ............................................................................. 65
Breakout Boxes and Harnesses ........................................................ 66
VECU Overview................................................................................ 67
VECU Functions ................................................................................ 68
Sensor Locations ............................................................................... 73
Control Unit Locations ....................................................................... 77
Fuses and Relays .............................................................................. 81
Troubleshooting ................................................................................... 85
Fault Code Troubleshooting ................................................................... 85
Message and Parameter Descriptions ................................................ 85
FMI Table ............................................................................................. 87
Reading/Clearing Fault Codes .......................................................... 88 1

Fault Tracing Strategy ....................................................................... 88
MID 128 EECU ...................................................................................... 92
MID 128 Fault Code Table .................................................................. 92
MID 128 PID 45 Preheater Status ...................................................... 96
Fault Codes ....................................................................................... 96
MID 128 PID 45 Preheater Status,Check.......................................... 97
MID 128 PID 49 ABS Control Status .................................................. 98
Fault Codes ....................................................................................... 98
MID 128 PID 49 ABS Control Status,Check...................................... 99
MID 128 PID 84 Road Speed ........................................................... 100
Fault Codes ..................................................................................... 100
MID 128 PID 84 Road Speed, Check............................................... 101
MID 128 PID 85 Cruise Control Status ............................................. 102
Fault Codes ..................................................................................... 102
MID 128 PID 85 Cruise Control Status,Check................................ 103
MID 128 PID 91 Accelerator Pedal Position ..................................... 104
Fault Codes ..................................................................................... 104
MID 128 PID 91 Accelerator Pedal Position, Check......................... 105
MID 128 PID 94 Fuel DeliveryPressure ........................................... 106
D7C and D12C ................................................................................ 106
Fault Codes ..................................................................................... 106
MID 128 PID 94 Fuel DeliveryPressure,Check.............................. 107
D7C and D12C ................................................................................ 107
MID 128 PID 100 Engine Oil Pressure ............................................. 110
Fault Codes ..................................................................................... 110
MID 128 PID 100 Engine Oil Pressure,Check................................. 111
MID 128 PID 102 Boost Pressure ..................................................... 114
Fault Codes ..................................................................................... 114
MID 128 PID 102 Boost Pressure,Check........................................ 115
MID 128 PID 105 Boost Air Temperature ......................................... 118
Fault Codes ..................................................................................... 118
MID 128 PID 105 Boost Air Temperature,Check............................. 119
MID 128 PID 107 Air Filter Differential Pressure .............................. 122
Fault Codes ..................................................................................... 122
MID 128 PID 107 Air Filter Differential Pressure,Check.................. 124
MID 128 PID 108 Atmospheric Pressure .......................................... 125
Fault Codes ..................................................................................... 125
MID 128 PID 110 Engine Coolant Temperature ............................... 126
Fault Codes ..................................................................................... 126
MID 128 PID 110 Engine Coolant Temperature,Check................... 127
MID 128 PID 111 Coolant Level ....................................................... 129
Fault Codes ..................................................................................... 129
MID 128 PID 111 Coolant Level, Check........................................... 130
MID 128 PID 158 BatteryVoltage ..................................................... 131
Fault Codes ..................................................................................... 131
MID 128 PID 158 BatteryVoltage,Check........................................ 132
MID 128 PID 172 Air Inlet Temperature ............................................ 133
Fault Codes ..................................................................................... 133
MID 128 PID 172 Air Inlet Temperature,Check............................... 134
MID 128 PID 174 Fuel Temperature ................................................. 136
D7C and D12C ................................................................................ 136
Fault Codes ..................................................................................... 136
MID 128 PID 174 Fuel Temperature,Check..................................... 137
D7C and D12C ................................................................................ 137
MID 128 PID 175 Engine Oil Temperature ....................................... 140
2

Fault Codes ..................................................................................... 140
MID 128 PID 175 Engine Oil Temperature,Check........................... 141
MID 128 PID 228 Road Speed Sensor Calibration .......................... 144
Fault Codes ..................................................................................... 144
MID 128 PID 228 Road Speed Sensor Calibration, Check.............. 145
MID 128 PPID 86 Engine BrakeTorque Percent .............................. 146
Fault Codes ..................................................................................... 146
MID 128 PPID 86 Engine BrakeTorque Percent, Check................. 147
MID 128 PPID 119 High Coolant Temperature ................................. 148
Fault Codes ..................................................................................... 148
MID 128 PPID 119 High Coolant Temperature,Check.................... 149
MID 128 PPID 122 VCB Engine Compression Brake...................... 151
D12B and D12C .............................................................................. 151
Fault Codes ..................................................................................... 151
MID 128 PPID 122 VCB Engine Compression Brake,Check.......... 152
D12B and D12C .............................................................................. 152
MID 128 PPID 123 EPG 2................................................................ 153
D12B and D12C .............................................................................. 153
Fault Codes ..................................................................................... 153
MID 128 PPID 123 EPG 2, Check.................................................... 154
D12B and D12C .............................................................................. 154
MID 128 PPID 124 EPG 1................................................................ 155
Fault Codes ..................................................................................... 155
MID 128 PPID 124 EPG 1, Check.................................................... 156
MID 128 SID 1/2/3/4/5/6 Injector ..................................................... 157
D12B and D12C .............................................................................. 157
Fault Codes ..................................................................................... 157
MID 128 SID 1/2/3/4/5/6 Injector,Check.......................................... 159
D12B and D12C .............................................................................. 159
MID 128 SID 17 Fuel Shutoff Valve.................................................. 161
Fault Codes ..................................................................................... 161
MID 128 SID 17 Fuel Shutoff Valve,Check...................................... 162
D7C only .......................................................................................... 162
MID 128 SID 20 Timing Sleeve......................................................... 163
D7C only .......................................................................................... 163
Fault Codes ..................................................................................... 163
MID 128 SID 20 Timing Sleeve, Check............................................ 165
D7C only .......................................................................................... 165
MID 128 SID 21 Engine Position Timing Sensor .............................. 166
D12B and D12C .............................................................................. 166
Fault Codes ..................................................................................... 166
MID 128 SID 21 Engine Position Timing Sensor,Check.................. 167
D12B and D12C .............................................................................. 167
MID 128 SID 21 Needle Lift Sensor ................................................. 168
Fault Codes ..................................................................................... 168
MID 128 SID 21 Needle Lift Sensor,Check..................................... 169
D7C only .......................................................................................... 169
MID 128 SID 22 Engine Speed Sensor ............................................ 170
Fault Codes ..................................................................................... 170
MID 128 SID 22 Engine Speed Sensor,Check................................ 171
MID 128 SID 23 RackActuator ......................................................... 172
D7C only .......................................................................................... 172
Fault Codes ..................................................................................... 172
MID 128 SID 23 RackActuator,Check............................................. 174
D7C only .......................................................................................... 174
3

MID 128 SID 24 RackPosition Sensor ............................................. 175
D7C only .......................................................................................... 175
Fault Codes ..................................................................................... 175
MID 128 SID 24 RackPosition Sensor,Check................................. 176
D7C only .......................................................................................... 176
MID 128 SID 33 Fan Control ............................................................. 177
Fault Codes ..................................................................................... 177
MID 128 SID 33 Fan Control, Check................................................ 178
MID 128 SID 64 Redundant Engine Speed Sensor ......................... 179
D7C only .......................................................................................... 179
Fault Codes ..................................................................................... 179
MID 128 SID 64 Redundant Engine Speed Sensor,Check............. 180
D7C only .......................................................................................... 180
MID 128 SID 70 Preheater Element 1.............................................. 181
Fault Codes ..................................................................................... 181
MID 128 SID 70 Preheater Element 1, Check.................................. 182
MID 128 SID 71 Preheater Element 2.............................................. 183
D12B only ........................................................................................ 183
Fault Codes ..................................................................................... 183
MID 128 SID 71 Preheater Element 2, Check.................................. 184
D12B ................................................................................................ 184
MID 128 SID 230 Idle Validation Switch 1........................................ 185
Fault Codes ..................................................................................... 185
MID 128 SID 230 Idle Validation Switch 1, Check............................ 186
MID 128 SID 231 SAE J1939 Control Link ....................................... 187
Fault Codes ..................................................................................... 187
MID 128 SID 232 5Volt DC Supply .................................................. 189
Fault Codes ..................................................................................... 189
MID 128 SID 232 5Volt DC Supply,Check...................................... 190
MID 128 SID 240 Program Memory................................................. 191
Fault Codes ..................................................................................... 191
MID 128 SID 250 SAE J1587/1708 Information Link ....................... 192
Fault Codes ..................................................................................... 192
MID 128 SID 253 Data Set MemoryEEPROM ................................ 193
Fault Codes ..................................................................................... 193
MID 128 SID 254 Engine Electronic Control Unit (EECU) ............... 194
Fault Codes ..................................................................................... 194
MID 144 VECU .................................................................................... 196
MID 144 Fault Code Table ................................................................ 196
MID 144 PID 29 Second Accelerator Pedal Position Sensor ........... 198
Fault Codes ..................................................................................... 198
MID 144 PID 29 Second Accelerator Pedal Position Sensor,Check199
MID 144 PID 84 Road Speed ........................................................... 201
Fault Codes ..................................................................................... 201
MID 144 PID 84 Road Speed, Check............................................... 202
MID 144 PID 91 Accelerator Pedal Position ..................................... 204
Fault Codes ..................................................................................... 204
MID 144 PID 91 Accelerator Pedal Position, Check......................... 205
MID 144 PID 152 VECU,Number of Resets .................................... 207
Fault Codes ..................................................................................... 207
MID 144 PPID 69 Idle Validation Switch ........................................... 208
Fault Codes ..................................................................................... 208
MID 144 PPID 69 Idle Validation Switch, Check.............................. 209
MID 144 PPID 70 Pedal Switches,Supply ....................................... 211
Fault Codes ..................................................................................... 211
4

MID 144 PPID 70 Pedal Switches,Supply,Check........................... 212
MID 144 PPID 71 Cruise Control and Engine Brake,Supply Switch 215
Fault Codes ..................................................................................... 215
MID 144 PPID 71 Cruise Control and Engine Brake,Supply
Switch, Check.................................................................................... 216
MID 144 PPID 72 Accelerator Pedal, Supply Sensors ..................... 220
Fault Codess ................................................................................... 220
MID 144 PPID 72 Accelerator Pedal, Supply Sensors,Check......... 221
MID 144 PPID 73 Second Accelerator Pedal, Supply Sensors ........ 223
Fault Codes ..................................................................................... 223
MID 144 PPID 73 Second Accelerator Pedal, Supply Sensors,
Check................................................................................................. 224
MID 144 PPID 75 Range Inhibitor,Solenoid ValveStatus ............... 226
Fault Codes ..................................................................................... 226
MID 144 PPID 75 Range Inhibitor,Solenoid ValveStatus,Check... 227
MID 144 SID 230 Idle Validation Switch 1........................................ 229
Fault Codes ..................................................................................... 229
MID 144 SID 230 Idle Validation Switch 1, Check............................ 230
MID 144 SID 231 SAE J1939 Control Link ....................................... 232
Fault Codes ..................................................................................... 232
MID 144 SID 231 SAE J1939 Control Link, Check.......................... 233
MID 144 SID 240 Program Memory................................................. 234
Fault Codes ..................................................................................... 234
MID 144 SID 243 Cruise Control Set Switch .................................... 235
Fault Codes ..................................................................................... 235
MID 144 SID 243 Cruise Control Set Switch, Check....................... 236
MID 144 SID 250 SAE J1587/1708 Information Link ....................... 238
Fault Codes ..................................................................................... 238
MID 144 SID 250 SAE J1587/1708 Information Link, Check........... 239
MID 144 SID 253 Data Set MemoryEEPROM ................................ 240
Fault Codes ..................................................................................... 240
MID 144 PSID 3Idle Validation Switch 3......................................... 241
Fault Codes ..................................................................................... 241
MID 144 PSID 3Idle Validation Switch 3, Check............................. 242
Service Procedures ........................................................................... 245
Engine ECU,Replacement ................................................................ 245
Feedback
Operation Numbers
5

6

Group 28 General
General
Vehicle Management System
W2002520
This information covers the Vehicle Management System, which includes VECTRO II
electronics, the vehicle ECU, and other control systems used in the vehicle.
7

Group 28 General
Engine Control System Glossary
ATA
American Trucking Association
ATDC (After Top Dead Center)
The 180

of crankshaft rotation after the piston reaches
top center (normal direction of rotation).
AC (Alternating Current)
An electrical current that alternates level and direction.
BTDC (Before Top Dead Center)
The 180

of crankshaft rotation before the piston reaches
top center (normal direction of rotation).
INFO lamp
Light that warns the operator of an active diagnostic fault
code; also referred to as the diagnostic lamp.
Data link
An electrical connection for communication with other
microprocessor-based devices (such as powertrain con-
trol, trip recorders and maintenance systems) that are
compatible with the ATA and SAE standard.
Diagnostic fault code
These codes indicate an electronic system malfunction,
indicating a problem with the D12 electrical systems.
Diagnostic flash code
Codes flashed out in a series via the INFO lamp to indi-
cate an active fault code.
DC (Direct Current)
An electrical current that flows in one direction only.
EEPROM (Electrical Erasable Programmable Read
Only Memory)
The contents of this type of memory may be electroni-
cally erased and new information programmed into the
device.
EECU (Engine Electronic Control Unit)
The computer that controls the power supplied to the en-
gine electronics, monitors and governs engine functions.
EUI (Electronic Unit Injector)
An injector pump which is mechanically activated and
electronically controlled. It combines metering and inject-
ing in a single unit.
Engine brake disable system
During the time ABS (anti-lock braking system) is active,
the engine brake is disabled.
FMI (Failure Mode Identifier)
Numbers and names used to identify how a system or
part failed.
FMI Description
0 Data valid but above normal operating range
1Data valid but below normal operating range
2Data erratic, intermittent, or incorrect
3Voltage above normal
4Voltage below normal
5Current below normal or open circuit
6Current above normal or short circuit
7Mechanical system not responding properly
8Abnormal frequency, pulse rate or period
9Abnormal update
10 Abnormal rate of change
11 Failure mode not identifiable
12 Defective device or component
13 Uncalibrated device or component
14/15 Reserved for future assignment
Hz (Hertz)
Measure of frequency in cycles per second.
MID
Message Identification Description
Open circuit
Condition where an electrical wire or connector is bro-
ken, preventing signal or supply voltage from reaching its
intended destination.
Parameter
A programmable value that affects the characteristics or
behavior of the engine and/or vehicle.
8

Group 28 General
PID
Parameter Identification code.
PTO (Power Takeoff)
Operated with the cruise control switches, this mode per-
mits setting a constant engine rpm when the vehicle is
not moving.
PWM (Pulse Width Modulation)
A signal consisting of variable-width pulses at fixed inter-
vals to vary; “TIME ON”versus versus “TIME OFF.”
RAM (Random Access Memory)
A memory that has stored information immediately avail-
able when addressed.
Reference voltage
A regulated voltage supplied by the EECU to a sensor,
which uses it to generate a signal voltage.
Password
A group of seven alphanumeric characters designed to
restrict access to level-2 parameters. The password is
automatically defaulted to seven empty spaces if cus-
tomer has not specified password.
SAE
Society of Automotive Engineers.
Short circuit
A connection of comparatively low resistance, acciden-
tally or intentionally made between two points on a
circuit.
SID
Subsystem Identification code.
Signal
A voltage value used to transmit information typically
from a sensor to the EECU.
Supply voltage
A constant voltage that supplies electrical power to a
component. It may be generated by the EECU or sup-
plied by the vehicle battery.
Throttle Position Sensor (TPS)
An electronic sensor that is connected to the accelerator
pedal and sends a Pulse Width Modulated signal to the
EECU.
Vehicle Specification Programming (VSP)
VSP consists of two levels of programming: engine con-
figuration (level 1) and customer parameters (level 2).
Vehicle Speed Sensor (VSS)
An electromagnetic device that measures vehicle speed
from the rotation of gear teeth in the drivetrain of the ve-
hicle.
VEB (Volvo Engine Brake)
Consists of a compression brake (VCB) and an exhaust
pressure governor (EPG).
9

Group 28 Specifications
Specifications
Description of Signals
EECU (D7C) and Breakout Box Connected in Series Between EECU
and Wiring Harness
For the measurements below, the following applies:
•Breakout box J-41132 connected between connec-
tor EA or EB and the EECU.
•Jumper harness J–43233 connected between con-
nector EA or EB and the EECU.
•The EECU connected.
•Ignition key in ON position.
•Engine not running.
•Measuring voltage.
W2003555
Fig. 1: EECU with pinouts
W2002712
Fig. 2: EECU voltage check, EA
W2002710
Fig. 3: EECU voltage check, EB
B+ = battery voltage
Connec-
tion Signal type Measuring points Ignition key in the ON position Other
EA1 Oil temperature sensor, signal EA1 - EA5 3.0 V (+20

C/68

F)
0.4 V (+100

C/212

F)
EA2 Intake manifold temperature sensor,
signal EA2 - EA5 2.6 V (+20

C/68

F)
1.6 V (+40

C/104

F)
EA3 Intake manifold pressure sensor, sig-
nal EA3 - EA5 1.1 V (sea level)
EA4 Supply to sensors (5 V), + EA4 - EA5 4.8 - 5.15 V
EA5 Signal ground to sensors, -
EA6 Not currently used
EA7 Redundant engine speed sensor, +
EA8 Rack drive PWM, +
EA9 Timing sleeve PWM, +
10

Group 28 Specifications
Connec-
tion Signal type Measuring points Ignition key in the ON position Other
EA10 Rack drive PWM, -
EA11 Not currently used
EA12 Not currently used
EA13 Fuel temperature sensor, signal EA13 - EA5 3.0 V (+20

C/68

F)
2.0 V (+40

C/104

F)
EA14 Oil pressure sensor, signal EA14 - EA5 0.5 V (for cold engines)
EA15 Needle lift sensor, +
EA16 Rack position sensor, search coil
EA17 Rack position sensor, common
EA18 Redundant engine speed sensor, -
EA19 Not currently used
EA20 Not currently used
EA21 Timing sleeve PWM, -
EA22 Not currently used
EA23 Not currently used
EA24 Not currently used
EA25 Coolant temperature sensor, signal EA25 - EA5 3.0 V (+20

C/68

F)
0.6 V (+85

C/185

F)
EA26 Not currently used
EA27 Fuel pressure sensor, signal EA27-EA5 ≈0.5V (for cold engines) D12 C
EA28 Needle lift sensor, -
EA29 Rack position sensor, reference coil
EA30 Engine speed sensor (crank), +
EA31 Engine speed sensor (crank), -
EA32 Not currently used
EA33 Not currently used
EA34 Not currently used
EA35 Not currently used
EA36 Not currently used
EB1 SAE J1939 A Communications link EB1/EB9 ≈2-5V
EB2 SAE J1939 B Communications link EB2/EB9 ≈0-3V
EB3 Ambient air temperature sensor, sig-
nal EB3 - EB13 2.6 V (+20

C/68

F)
1.2 V (+50

C/122

F)
EB4 Buffered idle validation switch EB4 - EB9 < 4 V (idle)
> 8 V (off idle)
EB5 Pre-heat sense 1 EB5 - EB9 55 % of B+ (open)
0 V (closed) Normally closed with the ignition key in the
ON position.
EB6 Not currently used
11

Group 28 Specifications
Connec-
tion Signal type Measuring points Ignition key in the ON position Other
EB7 Coolant level sensor, signal EB7 - EB8 80% B+ (open)
0 V (closed) Applies to WX and VN. Normally open
with the ignition key in
the ON position.
EB8 Signal ground to sensors, -
EB9 EECU ground, -
EB10 EECU ground, -
EB11 EECU B+ EB11 - EB9 B+
EB12 EECU B+ EB12 - EB10 B+
EB13 Ambient air temperature sensor
EB14 Not currently used
EB15 Not currently used
EB16 Not currently used
EB17 Air filter indicator sensor signal
EB18 Not currently used
EB19 Not currently used
EB20 Not currently used
EB21 Fan control (if equipped with on/off
fan) EB21 - EB9 B+ (fan on) 0 V (fan off) Normally ON with the ignition key in the ON
position.
EB22 Not currently used
EB23 Not currently used
EB24 EOL Enable EB24 - EB9 < 6 V or O/C (EOL Disable)
> 9.6 V (EOL Enable)
EB25 SAE J1587A/J1708A Information link EB25-EB9 ≈0-5V
EB26 SAE J1587B/J1708B Information link EB26-EB9 ≈0-5V
EB27 Not currently used
EB28 Not currently used
EB29 Not currently used
EB30 Not currently used
EB31 Pre-heating relay, Coil ground EB31 - EB9 B+ (pre-heat off)
0 V (pre-heat on) Normally ON with the ignition key in the ON
position.
EB32 Not currently used
EB33 Not currently used
EB34 Fuel shut-off valve EB34 - EB9 0 V (valve on)
> 1.0V (valve off) Normally ON with the ignition key in the ON
position.
EB35 EPG 1 EB35 - EB9 B+ (EPG off)
0 V (EPG on) Normally OFF with the ignition key in the
ON position.
EB36 Not currently used
12

Group 28 Specifications
EECU, D7C, with Breakout Box Connected to Wiring Harness Only
For the measurements below, the following applies:
•Breakout box J-41132 connected to connector EA or
EB.
•The EECU is not connected.
•Ignition key must be in the OFF position.
•Measuring resistance.
W2002711
Fig. 4: EECU harness checks, EA
W2002713
Fig. 5: EECU harness checks, EB
Connec-
tion Signal type Measuring points Ignition key in the OFF position Other
EA1 Oil temperature sensor, signal EA1 / EA5 1.9 k  (+20

C/68

F)
100
 (+100

C/212

F)
EA2 Intake manifold temperature sensor,
signal EA2 / EA5 6.2 k
 (+20

C/68

F)
2.5 k
 (+40

C/104

F)
EA3 Intake manifold pressure sensor, sig-
nal
EA4 Sensor supply to (5 V), +
EA5 Sensors ground , -
EA6 Not currently used
EA7 Redundant engine speed sensor, + EA7 / EA18 775 - 945

EA8 Rack drive PWM, + EA8 / EA10
EA8 / alternate
ground
1.5 
open circuit
EA9 Timing sleeve PWM, + EA9 / EA21
EA9 / alternate
ground
1.5 
open circuit
EA10 Rack drive PWM, - EA10 / alternate
ground open circuit (see also EA8)
EA11 Not currently used
EA12 Not currently used
EA13 Fuel temperature sensor, signal EA13 / EA5 1.9 k  (+20

C/68

F)
800
 (+40

C/104

F)
EA14 Oil pressure sensor, signal
EA15 Needle lift sensor, + EA15 / EA28 65 - 165 
EA16 Rack position sensor, search coil EA16 / EA17 20.0 
EA17 Rack position sensor, common
EA18 Redundant engine speed sensor, - EA18 / EA7 775 - 945

EA19 Not currently used
13

Group 28 Specifications
Connec-
tion Signal type Measuring points Ignition key in the OFF position Other
EA20 Not currently used
EA21 Timing sleeve PWM, - EA21 / alternate
ground open circuit (see also EA9)
EA22 Not currently used
EA23 Not currently used
EA24 Not currently used
EA25 Coolant temperature sensor, signal EA25 / EA5 1.9 k

(+20

C/68

F)
160

(+85

C/185

F)
EA26 Not currently used
EA27 Fuel pressure sensor D12 C
EA28 Needle lift sensor, -
EA29 Rack position sensor, reference coil EA29 / EA17 20.0

EA30 Engine speed sensor (crank), + EA30 / EA31 775 - 945

EA31 Engine speed sensor (crank), - EA31 / EA30 775 - 945

EA32 Not currently used
EA33 Not currently used
EA34 Not currently used
EA35 Not currently used
EA36 Not currently used
EB1 SAE J1939A Communications link
EB2 SAE J1939B Communications link
EB3 Ambient air temperature sensor, sig-
nal EB3 / EB13 6.2 k
 (+20

C/68

F)
1.7 k
 (+50

C/122

F)
EB4 Buffered idle validation switch
EB5 Pre-heat sense 1 EB5 / EB9 open circuit (open)
<5
 (closed)
EB6 Not currently used
EB7 Coolant level sensor, signal EB7 / EB8 open circuit (coolant level normal)
<1
 (coolant level low) Applies to WX and VN
EB8 Sensor ground
EB9 EECU ground, -
EB10 EECU ground, -
EB11 EECU, B+
EB12 EECU, B+
EB13 Ambient air temperature ground
EB14 Not currently used
EB15 Not currently used
EB16 Not currently used
EB17 Air filter indicator sensor signal
EB18 Not currently used
EB19 Not currently used
EB20 Not currently used
EB21 Not currently used
EB22 Not currently used
EB23 Not currently used
EB24 EOL Enable EB24/EB9 open circuit (open)
14

Group 28 Specifications
Connec-
tion Signal type Measuring points Ignition key in the OFF position Other
EB25 / (connection
A in 6 pin diagnos-
tics connector)
<1

EB25 SAE J1587/J1708 A Information link EB25 / (connection
F in 9 pin diagnos-
tics connector)
<1 
EB26 / (connection
B in the 6 pin diag-
nostics connector)
<1  EB26 SAE J1587/J1708 B Information link
EB26 / (connection
G in the 9 pin diag-
nostics connector)
<1 
EB27 Not currently used
EB28 Not currently used
EB29 Not currently used
EB30 Not currently used
EB31 Pre-heating relay, coil ground
EB32 Not currently used
EB33 Not currently used
EB34 Fuel shut-off valve, include
EB35 EPG 1, -
EB36 Not currently used
15

Group 28 Specifications
EECU (D12B and D12C), Breakout Box Connected in Series Between
EECU and Wiring Harness
For the measurements below, the following applies:
•Breakout box J-41132 connected between connec-
tor EA or EB and the EECU.
•Jumper harness J43233 connected between con-
nector EA or EB and the EECU.
•The EECU connected.
•Ignition key in ON position.
•Engine not running.
•Measuring voltage.
W2002712
Fig. 6: EECU voltage check, EA
W2002710
Fig. 7: EECU voltage check, EB
B+ = battery voltage
Connec-
tion Signal type Measuring points Ignition key in the ON position Other
EA1 Oil temperature sensor, signal EA1 / EA5 3.0 V (+20

C/68

F)
0.4 V (+100

C/212

F)
EA2 Intake manifold temperature sensor,
signal EA2 / EA5 2.6 V (+20

C/68

F)
1.6 V (+40

C/104

F)
EA3 Intake manifold pressure sensor, sig-
nal EA3 / EA5 1.1 V (sea level)
EA4 Sensor supply (5 V), + EA4 / EA5 4.8 - 5.15 V
EA5 Sensor ground
EA6 Not currently used
EA7 Engine position sensor (cam), +
EA8 Not currently used
EA9 Not currently used
EA10 Not currently used
EA11 Unit injector cylinder 1, -
EA12 Unit injector cylinder 1, 2, 3 (90
Volt), +
EA13 Fuel temperature sensor, signal D12 C
EA14 Oil pressure sensor, signal EA14 / EA5 0.5 V (for cold engines)
EA15 Not currently used
16

Group 28 Specifications
Connec-
tion Signal type Measuring points Ignition key in the ON position Other
EA16 Not currently used
EA17 Not currently used
EA18 Engine position sensor (cam), -
EA19 Not currently used
EA20 Not currently used
EA21 Not currently used
EA22 Unit injector cylinder 2, -
EA23 Unit injector cylinder 3, -
EA24 Unit injector cylinder 4, 5, 6 (90
Volt), +
EA25 Coolant temperature sensor, signal EA25 / EA5 3.0 V (+20

C/68

F)
0.6 V (+85

C/185

F)
EA26 Not currently used
EA27 Fuel pressure sensor D12 C
EA28 Not currently used
EA29 Not currently used
EA30 Engine speed sensor (crank), +
EA31 Engine speed sensor (crank), -
EA32 Not currently used
EA33 VCB, - EA33 / alternate
ground B+ (VCB off) 0 V (VCB on) Normally OFF with the ignition key in the
ON position.
EA34 Unit injector cylinder 4, -
EA35 Unit injector cylinder 5, -
EA36 Unit injector cylinder 6, -
EB1 SAE J1939 Communications link,
can HI EB1/EB9 ≈2-5V
EB2 SAE J1939 Communications link,
can LOW EB2/EB9 ≈0-3V
EB3 Ambient air temperature sensor, sig-
nal EB3 / EB13 2.6 V (+20

C/68

F)
1.2 V (+50

C/122

F)
EB4 Buffered idle validation switch EB4 / EB9 < 4 V (inactive)
> 8 V (active)
EB5 Pre-heat sense 1 (if equipped) EB5 / EB9 55% of B+ (open)
0 V (closed) Normally closed with the ignition key in the
ON position.
EB6 Not currently used
EB7 Coolant level sensor, signal EB7 / EB8 80% B+ (open)
0 V (closed) VN and VHD. Nor- mally open with the
ignition key in the ON
position.
EB8 Sensor ground
EB9 EECU ground, -
EB10 EECU ground, -
17

Group 28 Specifications
Connec-
tion Signal type Measuring points Ignition key in the ON position Other
EB11 EECU B+ EB11 / EB9 B+
EB12 EECU B+ EB12 / EB10 B+
EB13 Ambient air temperature sensor
EB14 Not currently used
EB15 Not currently used
EB16 Pre-heat sensor 2 (if equipped) EB16 / EB9 55 % of B+ (open)
0 V (closed) Normally closed with the ignition key in the
ON position.
EB17 Air filter indicator sensor signal
EB18 Not currently used
EB19 Not currently used
EB20 Not currently used
EB21 Engine fan control (if equipped with
on/off fan), - EB21 / EB9 B+ (fan on/solenoid inactive) 0 V (fan off/solenoid active) Normally ON with the ignition key in the ON
position.
EB22 Not currently used
EB23 Not currently used
EB24 EOL Enable EB24 / EB9 < 6 V or O/C (EOL disable)
> 9.6 V (EOL Enable)
EB25 SAE J1587/J1708 + Information link
EB26 SAE J1587/J1708 - Information link EB25/EB9 ≈0-5V
EB27 Not currently used EB26/EB9 ≈0-5V
EB28 Not currently used
EB29 Not currently used
EB30 Not currently used
EB31 Pre-heating relay coil ground (if
equipped) EB31 / EB9 B+ (pre-heat off) 0 V (pre-heat on) Normally OFF with the ignition key in the
ON position.
EB32 Not currently used
EB33 Not currently used
EB34 Not currently used
EB35 EPG 1 EB35 / EB9 B+ (EPG off)
0 V (EPG on) Normally OFF with the ignition key in the
ON position.
EB36 EPG 2 EB36 / EB9 B+ (EPG off)
0 V (EPG on) Normally OFF with the ignition key in the
ON position.
18