Volvo Trucks MID 146 User manual

Service Manual
Trucks
Group 87
Fault Codes, Climate Control
MID 146
CU-BAS, CU-MCC, CU-ECC
VN, VHD VERSION2
PV776-TSP196483

Foreword
The descriptions and service procedures contained in this manual are based on designs
and methods studies carried out up to October 2003.
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
service 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 a
reference to an V.S.T. (Volvo Standard Times).
Service procedures which do not include an operation number in the title are for general
information and no reference is made to an V.S.T.
Each section of this manual contains specific safety information and warnings which
must be reviewed before performing any procedure. If a printed copy of a procedure is
made, be sure to also make a printed copy of the safety information and warnings that
relate to that procedure. The following levels of observations, cautions and warnings
are used in this Service Documentation:
Note: Indicates a situation, handling or circumstance which should be observed.
Caution: Indicates a potentially hazardous situation which, if not avoided, may result in
minor or moderate injury or damage to property.
Warning: Indicates a potentially hazardous situation which, if not avoided, could result
in death, serious injury or major damage to property.
Danger: Indicates an imminently hazardous situation which, if not avoided, will result in
death or serious injury.
Volvo Trucks North America, Inc.
Greensboro, NC USA
Order number: PV776-TSP196483
Repl: This Service Manual replaces Service Manual 87, “Fault Codes, Climate Control MID 146” (11.2002), publication
number PV776–TSP177273 and Service Bulletin 870–14, “Fault Codes, Climate Control MID 146, New Tool, 84105675”
(08.2003), publication number PV776–TSP194734
© 2003 Volvo Trucks 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,
mechanical, photocopying, recording or otherwise, without the prior written
permission of Volvo Trucks North America, Inc.. USA14332

Contents
Specifications.........................................................................................3
ClimateUnit,SignalDescription............................................................3
Tools........................................................................................................7
SpecialEquipment.................................................................................7
Troubleshooting.....................................................................................9
MID146FaultCodeTable.....................................................................9
MID146SID2TemperatureSensor,Evaporator................................11
MID146SID2TemperatureSensorEvaporator,Check.....................12
MID146SID5StepperMotor,FreshAirandRecirculation................14
MID146SID5StepperMotorFreshAir-recirculation,Check.............15
MID146SID6StepperMotor,AirDistribution....................................16
MID146SID6StepperMotorAirDistribution,Check.........................17
MID146SID9StepperMotor,AirMix.................................................18
MID146SID9StepperMotor,AirMix/HeatControl,Check..............19
MID146SID11SolenoidClutch,Compressor...................................20
MID146SID12WaterControlValve..................................................21
MID146SID12WaterControlValve,Check......................................22
MID146SID13TemperatureSensor,HeatExchanger......................24
MID146SID13TemperatureSensorHeatExchanger,Check...........25
MID146SID14CirculationFan,TemperatureSensor,Cab...............27
MID146SID15EngineFanRequest..................................................28
MID146SID16StepperMotor,Phase1............................................29
MID146SID16StepperMotorPhase1,Check.................................30
MID146SID17StepperMotor,Phase2............................................31
MID146SID17StepperMotorPhase2,Check.................................32
MID146SID18StepperMotor,Phase3............................................33
MID146SID18StepperMotorPhase3,Check.................................34
MID146SID19StepperMotor,Phase4............................................35
MID146SID19StepperMotorPhase4,Check.................................36
MID146SID22PressureSensor,Refrigerant....................................37
MID146SID22PressureSensorRefrigerantHighPressureSide,
Check..................................................................................................38
MID146SID2325VoltSupplySensors.............................................40
MID146SID2325VoltSupplySensors,Check.................................41
MID146SID250J1708InformationLink............................................42
MID146PID170TemperatureSensor,Cab.......................................43
MID146PID170TemperatureSensorCab,Check............................44
MID146PID171TemperatureSensor,AmbientTemperature...........46
OperationNumbers
1

2

Group 87 Climate Control, Fault Codes Specifications
Specifications
Climate Unit, Signal Description
Connection between the control unit and cable harness
T8008833
W8003419
1 BSA (15 pin)
2 BSB (21 pin)
Conditions:
•Breakout box 9998699 connected to adapter 9998596
between the control unit and cable harness.
•Breakout box 9998699 connected to adapter 9990025
between the control unit and cable harness.
V= direct current voltage (V)
B+ = battery voltage
R= resistance in ohms ( )
Termi-
nal Signal type Measurement points Nominal value Other
BSA1 Not connected
BSA2 Not connected
BSA3 Not connected
BSA4 Not connected
BSA5 Sensor cab temperature, signal
voltage BSA5 - BSB3 V ≈0–5V
BSA6 Dash Illumination BSA6 - BSA15 V ≈5 - 12 V 10 - 90 % of B+
BSA7
BSA8 Fan control, signal voltage BSA8 - BSA15 V ≈0 - 10 V Rotate fan control
knob
3

Group 87 Climate Control, Fault Codes Specifications
Termi-
nal Signal type Measurement points Nominal value Other
BSA9 Power supply, ignition key in
driving position BSA9 - BSA15 V ≈B+ 15
BSA10
BSA11 Supply voltage BSA11 - BSA15 V ≈B+ 30
BSA12 Magnetic clutch, air
conditioning (A/C) compressor BSA12 - BSA15 V ≈B+ Engine running
BSA13
BSA14 Fan, sensor cab temperature BSA14 - BSA15 V ≈B+
BSA15 Ground connection BSA15 - Ground V ≈0VDC 31
BSB1
BSB2 Engine fan control BSB2 - BSA15 V ≈B+ Engine cooling fan
active
BSB3 Ground terminal sensor BSB3 - Ground V ≈0VDC
BSB4 SAE J1708 Data link B BSB4 - Ground V ≈0-5VDC
BSB5 SAE J1708 Data link A BSB5 - Ground V ≈0 - 5V DC
BSB6 Sensor sytem pressure, signal
volts BSB6 - Ground V ≈0.5 - 4.5 V DC
BSB7 Stepper motor phase 1 (low)
BSB8 Stepper motor phase 2 (low)
BSB9 Stepper motor phase 3 (low)
BSB10 Stepper motor phase 4 (low)
BSB11 Stepper motor, by pass, signal
voltage BSB11 - BSB7 - 10 V ≈<10V Stepper motor active (Rotate
knob)
BSB12 Stepper Motor, Air distribution,
signal voltage BSB12 - BSB7 - 10 V ≈<10V Stepper motor active (Rotate
knob)
BSB13 Stepper Motor, recirculation,
signal voltage BSB13 - BSB7 - 10 V ≈<10V Stepper motor active (Rotate
knob)
BSB14
BSB15 Engine coolant valve, voltage
supply BSB15 - BSA15 V ≈B+ Select Max heat position, Electronic
climate control
(ECC) only
BSB16
BSB17
BSB18 Sensor system pressure,
voltage supply (5v) BSB18 - BSA15 V ≈4.5 - 5.5V
BSB19 Temperaturesensorevaporator,
signal voltage BSB19 - BSA15 V ≈0-5V
BSB20 Temperature sensor, heat
exchanger, signal voltage BSB20 - BSA15 V ≈0-5V
BSB21 Not connected
4

Group 87 Climate Control, Fault Codes Specifications
Connected to the cable harness
T8008832
W8003419
1 BSA (15 pin)
2 BSB (21 pin)
Conditions:
•Breakout box 9998699 with adapter 9990025
connected to cable harness.
•Breakout box 9998699 with adapter 9998596
connected to cable harness.
•Control unit disconnected.
R= resistance in ohms ( )
Termi-
nal Signal type Measurement points Nominal value Other
BSA1
BSA2
BSA3
BSA4
BSA5 Sensor cab temperature BSA5 - BSB3 R ≈12.5 k 20 C (68 F)
BSA6
BSA7
BSA8 Fan control BSA8 - BSA15 R ≈100 k
BSA9
BSA10
BSA11
BSA12 Magnetic clutch, air
conditioning (A/C) compressor BSA12 - BSA15 R ≈6k
5

Group 87 Climate Control, Fault Codes Specifications
Termi-
nal Signal type Measurement points Nominal value Other
BSA13
BSA14
BSA15 Ground connection BSA15 - Ground R ≈0
BSB1
BSB2
BSB3
BSB4
BSB5
BSB6 Sensor, system pressure BSB6 - BSB3 R ≈2
R≈6
R≈10
R≈15
2 bar
9 bar
18 bar
30 bar
BSB7
BSB8
BSB9
BSB10
BSB11
BSB12
BSB13
BSB14
BSB15 Engine coolant valve, voltage
supply BSB15 - BSA11 R ≈50 FuseF32,removed
BSB16
BSB17
BSB18 Sensor, system pressure BSB18 - BSB3 R ≈112 k 4.5 bar
BSB19 Temperature sensor evaporator BSB19 - BSB3 R ≈3.5 k 20 C (68 F)
BSB20 Temperature sensor heat
exchanger BSB20 - BSB3 R ≈12.5 k 20 C (68 F)
BSB21 Not connected
6

Group 87 Climate Control, Fault Codes Tools
Tools
Special Equipment
For special tools and other special equipment ordering instructions, see tool information
in group 08.
Special tools
9990025 9998534 9998596
AC Adapter 4 pin DIN adapter AC Adapter
9998699
Breakout box
7