Zurich ZR11 User manual

Table of Contents
i ZR11
ABOUT THE CODE READER
IMPORTANT SAFETY INFORMATION.................................... 1
VEHICLES COVERED ............................................................. 2
BATTERY REPLACEMENT ..................................................... 3
CODE READER CONTROLS
CONTROLS AND INDICATORS ............................................. 4
DISPLAY FUNCTIONS ............................................................ 6
ONBOARD DIAGNOSTICS
OBD2 TERMINOLOGY ............................................................ 8
DIAGNOSTIC TROUBLE CODES (DTCs) ............................... 9
OBD2 MONITORS ................................................................... 12
PREPARATION FOR TESTING
BEFORE YOU BEGIN .............................................................. 15
USING THE CODE READER
CODE RETRIEVAL PROCEDURE .......................................... 16
THE SYSTEM MENU ............................................................... 22
VIEWING OEM ENHANCED DTCs ......................................... 23
VIEWING ABS DTCs ............................................................... 44
ERASING DIAGNOSTIC TROUBLE CODES (DTCs) .............. 46
I/M READINESS TESTING ...................................................... 48
LIVE DATA MODE
VIEWING LIVE DATA .............................................................. 53
CUSTOMIZING LIVE DATA (PIDs) ......................................... 55
ADDITIONAL TESTS
SYSTEM TEST MENU ............................................................. 57
VIEWING VEHICLE INFORMATION ........................................ 61
RESETTING THE OIL MAINTENANCE LIGHT ....................... 64
USING THE DLC LOCATOR ................................................... 65
BATTERY RESET .................................................................... 66
BATTERY/ALTERNATOR MONITOR ..................................... 68
VIEWING TRIP CYCLE PROCEDURES ................................. 71
VIEWING THE FIRMWARE VERSION .................................... 73
THE TOOL LIBRARY ............................................................... 73
ADJUSTMENTS AND SETTINGS ........................................... 76
USING CODE READER MEMORY
VIEWING DATA IN MEMORY ................................................. 80
GENERIC (GLOBAL) OBD2 PID LIST ............................................ 82
VEHICLE APPLICATIONS - ABS
VEHICLE APPLICATIONS – MAKES COVERED .................... 87
VEHICLE APPLICATIONS - OIL RESET
VEHICLE APPLICATIONS – MAKES COVERED .................... 88
GLOSSARY
GLOSSARY OF TERMS AND ABBREVIATIONS ................... 89
WARRANTY AND SERVICING
LIMITED 90 DAY WARRANTY ................................................ 93
SERVICE PROCEDURES ....................................................... 93

Safety Precautions
IMPORTANT SAFETY INFORMATION
1
IMPORTANT SAFETY INFORMATION
1. Operating a vehicle indoors CAN KILL YOU IN MINUTES. Engine
exhaust contains carbon monoxide. This is a poison you cannot see
or smell. NEVER operate vehicle inside a home or garage, EVEN IF
doors and windows are open. Only use OUTSIDE and far away
from windows, doors, and vents.
2. People with pacemakers should consult their physician(s) before
use. Electromagnetic fields in close proximity to heart pacemaker
could cause pacemaker interference or pacemaker failure. Caution
is necessary when near coil, spark plug cables, or distributor of
running engine. Engine should be off during distributor adjustment.
3. Keep clothing, hair, hands, tools, test equipment, etc. away from all
moving or hot engine parts.
4. Put the transmission in PARK (for automatic transmission) or
NEUTRAL (for manual transmission) and make sure the parking
brake is engaged.
5. Put blocks in front of and behind the drive wheels.
6. Read vehicle service manual before inspecting, maintaining, or
repairing a vehicle.
7. Wear ANSI-approved safety goggles.
8. Never leave the vehicle unattended while running tests.
9. Keep a fire extinguisher suitable for gasoline/chemical/electrical fires
nearby.
10. Don’t connect or disconnect any test equipment while the ignition is
on or the engine is running.
11. This product is not a toy. Keep it out of reach of children.
12. Keep the Scan Tool dry, clean, free from oil, water or grease. Use a
mild detergent on a clean cloth to clean the outside of the Scan Tool,
when necessary.
13. The warnings, precautions, and instructions discussed in this
instruction manual cannot cover all possible conditions and
situations that may occur. It must be understood by the operator that
common sense and caution are factors which cannot be built into
this product, but must be supplied by the operator.
SAVE THESE INSTRUCTIONS.
Read all safety warnings and all instructions.
Failure to follow the warnings and instructions may result in
electric shock, fire and/or serious injury.
Save all warnings and instructions for future reference.

About the Code Reader
VEHICLES COVERED
2 ZR11
VEHICLE EMISSION CONTROL INFORMATION
VEHICLE
MANUFACTURER
OBD II
CERTIFIED
ENGINE FAMILY EFN2.6YBT2BA
DISPLACEMENT 2.6L
THIS VEHICLE CONFORMS TO U.S. EPA AND STATE
OF CALIFORNIA REGULATIONS APPLICABLE TO
1999 MODEL YEAR NEW TLEV PASSENGER CARS.
REFER TO SERVICE MANUAL FOR ADDITIONAL INFORMATION
TUNE-UP CONDITIONS: NORMAL OPERATING ENGINE TEMPERATURE,
ACCESSORIES OFF, COOLING FAN OFF, TRANSMISSION IN NEUTRAL
SPARK PLUG
TYPE NGK BPRE-11
GAP: 1.1MM
CATALYST
EXHAUST EMISSIONS STANDARDS STANDARD CATEGORY
CERTIFICATION
IN-USE
TLEV
TLEV INTERMEDIATE
OBD II
CERTIFIED
VEHICLES COVERED
All 1996 and newer vehicles (cars and light trucks) sold in the United
States are OBD2 compliant.
Federal law requires that all 1996 and newer cars and light
trucks sold in the United States must be OBD2 compliant; this
includes all Domestic, Asian and European vehicles.
Some 1994 and 1995 vehicles are OBD2 compliant. To find out if a
1994 or 1995 vehicle is OBD2 compliant, check the following:
1. The Vehicle Emissions Control Information (VECI) Label. This
label is located under the hood or by the radiator of most vehicles. If
the vehicle is OBD2 compliant, the label will state “OBD II
Certified.”
2. Government Regulations require that all
OBD2 compliant vehicles must have a
“common” sixteen-pin Data Link
Connector (DLC).
Some 1994 and 1995 vehicles have 16-pin connectors but are
not OBD2 compliant. Only those vehicles with a Vehicle
Emissions Control Label stating “OBD II Certified” are OBD2
compliant.
Data Link Connector (DLC) Location
The 16-pin DLC is usually
located under the instrument
panel (dash), within 12 inches
(300 mm) of center of the panel,
on the driver’s side of most
vehicles. It should be easily
accessible and visible from a
kneeling position outside the
vehicle with the door open.
12345678
9 10111213141516
NEAR
CENTER
OF DASH
BEHIND
ASHTRAY
LEFT CORNER
OF DASH

About the Code Reader
BATTERY REPLACEMENT
3
On some Asian and European vehicles the DLC is located
behind the “ashtray” (the ashtray must be removed to
access it) or on the far left corner of the dash. If the DLC
cannot be located, consult the vehicle’s service manual for
the location.
BATTERY REPLACEMENT
Replace batteries when the battery symbol is visible on display
and/or the 3 LEDS are all lit and no other data is visible on screen.
1. Locate the battery cover on the back of the Code Reader.
2. Slide the battery cover off (use your fingers).
3. Replace batteries with three AA-size batteries (for longer life, use
Alkaline-type batteries).
4. Reinstall the battery cover on the back of the Code Reader.
Adjustments After Battery Installation
The first time the Code Reader is turned on, you must select the desired
display language (English, French or Spanish) and unit of measurement
(Standard or metric) as follows:
1. Press the POWER/LINK button
to turn the Code Reader “ON.”
The Select Language screen dis-
plays.
2. Use the UP and DOWN buttons,
as necessary, to highlight the desired
display language.
3. When the desired display language is
selected, press the ENTER button
to confirm your selection.
The Select Unit screen displays.
4. Use the UP and DOWN buttons,
as necessary, to highlight the desired
unit of measurement.
5. When the desired unit of measurement
is selected, press the ENTER
button to confirm your selection.
The Code Reader’s Firmware
Version screen displays.
After the initial language and unit of measurement selections
are performed, these, as well as other settings, can be
changed as desired. Proceed to “ADJUSTMENTS AND
SETTINGS” on page 76 for further instructions.

Code Reader Controls
CONTROLS AND INDICATORS
4 ZR11
CONTROLS AND INDICATORS
Figure 1. Controls and Indicators
See Figure 1 for the locations of items 1 through 20, below.
1. ERASE button - Erases Diagnostic Trouble Codes (DTCs),
and “Freeze Frame” data from your vehicle’s computer, and resets
Monitor status.
2. SYSTEM MENU button – When pressed, displays the System
Test Menu.
3. DTC/FF button - Displays the DTC View screen and/or scrolls the
LCD display to view DTCs and Freeze Frame data.
4. POWER/LINK button - When the Code Reader IS NOT
connected to a vehicle, turns the Code Reader “On” and “Off”.
When the Code Reader is connected to a vehicle, links the Code
Reader to the vehicle’s PCM to retrieve diagnostic data from the
computer’s memory.
5. Mbutton – When pressed, displays the Main Menu.
6. LD button – When pressed while linked to a vehicle, places the
Code Reader in Live Data mode.
7. UP button – When in MENU mode, scrolls UP through the
menu and submenu selection options. When LINKED to a vehicle,
scrolls UP through the current display screen to display any
additional data.
13
14
12
7
4
5
6
9
1
11
10
2
3
8

Code Reader Controls
CONTROLS AND INDICATORS
5
8. ENTER button - When in MENU mode, confirms the selected
option or value.
9. DOWN button - When in MENU mode, scrolls DOWN through
the menu and submenu selection options. When LINKED to a
vehicle, scrolls DOWN through the current display screen to display
any additional data.
10. GREEN LED - Indicates that all engine systems are running
normally (all Monitors on the vehicle are active and performing their
diagnostic testing, and no DTCs are present).
11. YELLOW LED - Indicates there is a possible problem. A “Pending”
DTC is present and/or some of the vehicle’s emission monitors have
not run their diagnostic testing.
12. RED LED - Indicates there is a problem in one or more of the
vehicle’s systems. The red LED is also used to show that DTC(s)
are present. DTCs are shown on the Code Reader’s display. In this
case, the Malfunction Indicator (“Check Engine”) lamp on the
vehicle’s instrument panel will light steady on.
13. Display - Color LCD display shows menu and submenus, test
results, Code Reader functions and Monitor status information. See
DISPLAY FUNCTIONS (page 9) for more details.
14. CABLE - Connects the Code Reader to the vehicle’s Data Link
Connector (DLC).

Code Reader Controls
DISPLAY FUNCTIONS
6 ZR11
DISPLAY FUNCTIONS
Figure 2. Display Functions
See Figure 2 for the locations of items 1 through 14, below.
1. I/M MONITOR STATUS field - Identifies the I/M Monitor status area.
2. Monitor icons - Indicate which Monitors are supported by the
vehicle under test, and whether or not the associated Monitor has
run its diagnostic testing (Monitor status). When a Monitor icon is
solid green, it indicates that the associated Monitor has completed
its diagnostic testing. When a Monitor icon is flashing red, it
indicates that the vehicle supports the associated Monitor, but the
Monitor has not yet run its diagnostic testing.
3. Vehicle icon - Indicates whether or not the Code Reader is
being properly powered through the vehicle’s Data Link Connector
(DLC). A visible icon indicates that the Code Reader is being
powered through the vehicle’s DLC connector.
4. Link icon - Indicates whether or not the Code Reader is
communicating (linked) with the vehicle’s on-board computer. When
visible, the Code Reader is communicating with the computer. If the
Link icon is not visible, the Code Reader is not communicating with
the computer.
5. Computer icon - When this icon is visible it indicates that the
Code Reader is linked to a personal computer. Optional software is
available that makes it possible to upload retrieved data to a
personal computer.
6. Code Reader Internal Battery icon - When visible, indicates the
Code Reader batteries are “low” and should be replaced. If the
batteries are not replaced when the battery symbol is "on", all 3
LEDs will light up as a last resort indicator to warn you that the
batteries need replacement. No data will be displayed on screen
when all 3 LEDs are lit.
4
3
2
5
8
6
7
1
11
12
13
9
10
14

Code Reader Controls
DISPLAY FUNCTIONS
7
7. DTC Display Area - Displays the Diagnostic Trouble Code (DTC)
number. Each fault is assigned a code number that is specific to that
fault. The DTC number is color-coded as follows:
RED - Indicates the currently displayed DTC is a PERMANENT
DTC.
YELLOW - Indicates the currently displayed DTC is a PENDING
DTC.
GREEN - In cases where no codes are retrieved, a “No DTCs
are presently stored in the vehicle’s computer” message is
shown in green.
8. Code Number Sequence - The Code Reader assigns a sequence
number to each DTC that is present in the computer’s memory,
starting with “1.” This number indicates which code is currently
displayed. Code number “1” is always the highest priority code, and
the one for which “Freeze Frame” data has been stored.
If “1” is a “Pending” code, there may or may not be “Freeze
Frame” data stored in memory.
9. Code Enumerator - Indicates the total number of codes retrieved
from the vehicle’s computer.
10. Test Data Display Area - Displays DTC definitions, Freeze Frame
data and other pertinent test information messages.
11. SYSTEM icon - Indicates the system with which the code is
associated:
MIL icon ABS icon
12. FREEZE FRAME icon - Indicates that there is Freeze Frame data
from “Priority Code” (Code #1) stored in the vehicle’s computer
memory.
13. Code type - Indicates the type of code being displayed; Generic
Stored, Generic Pending, Generic permanent, etc.
14. Severity - Indicates the level of severity for the priority code (code
number “1”), as follows:
1 -Service should be scheduled and repairs made when
convenient. This DTC typically has no immediate threat to
essential system components in the short term.
2 -Repair immediately if drivability issues are present. Threat to
essential system components if not repaired as soon as possible.
3 -Stop and repair vehicle immediately to prevent interrelated
failures. Harmful and damaging to essential system components.

Onboard Diagnostics
OBD2 TERMINOLOGY
8 ZR11
OBD2 TERMINOLOGY
The following terms and their definitions are related to OBD2 systems.
Read and reference this list as needed to aid in the understanding of
OBD2 systems.
Powertrain Control Module (PCM) - The PCM is the OBD2
accepted term for the vehicle’s “on-board computer.” In addition to
controlling the engine management and emissions systems, the
PCM also participates in controlling the powertrain (transmission)
operation. Most PCMs also have the ability to communicate with
other computers on the vehicle (ABS, ride control, body, etc.).
Monitor - Monitors are “diagnostic routines” programmed into the
PCM. The PCM utilizes these programs to run diagnostic tests, and
to monitor operation of the vehicle’s emissions-related components
or systems to ensure they are operating correctly and within the
vehicle’s manufacturer specifications. Currently, up to fifteen
Monitors are used in OBD2 systems. Additional Monitors will be
added as the OBD2 system is further developed.
Not all vehicles support all fifteen Monitors.
Enabling Criteria - Each Monitor is designed to test and monitor the
operation of a specific part of the vehicle’s emissions system (EGR
system, oxygen sensor, catalytic converter, etc.). A specific set of
“conditions” or “driving procedures” must be met before the computer
can command a Monitor to run tests on its related system. These
“conditions” are known as “Enabling Criteria.” The requirements and
procedures vary for each Monitor. Some Monitors only require the
ignition key to be turned “On” for them to run and complete their
diagnostic testing. Others may require a set of complex procedures,
such as, starting the vehicle when cold, bringing it to operating
temperature, and driving the vehicle under specific conditions before
the Monitor can run and complete its diagnostic testing.
Monitor Has/Has Not Run - The terms “Monitor has run” or
“Monitor has not run” are used throughout this manual. “Monitor
has run,” means the PCM has commanded a particular Monitor to
perform the required diagnostic testing on a system to ensure the
system is operating correctly (within factory specifications). The term
“Monitor has not run” means the PCM has not yet commanded a
particular Monitor to perform diagnostic testing on its associated part
of the emissionssystem.
Trip - A Trip for a particular Monitor requires that the vehicle is
being driven in such a way that all the required “Enabling Criteria”
for the Monitor to run and complete its diagnostic testing are met.
The “Trip Drive Cycle” for a particular Monitor begins when the
ignition key is turned “On.” It is successfully completed when all the
“Enabling Criteria” for the Monitor to run and complete its diagnostic
testing are met by the time the ignition key is turned “Off.” Since
each of the fifteen monitors is designed to run diagnostics and
testing on a different part of the engine or emissions system, the
“Trip Drive Cycle” needed for each individual Monitor to run and
complete varies.

Onboard Diagnostics
DIAGNOSTIC TROUBLE CODES (DTCs)
9
OBD2 Drive Cycle - An OBD2 Drive Cycle is an extended set of
driving procedures that takes into consideration the various types of
driving conditions encountered in real life. These conditions may
include starting the vehicle when it is cold, driving the vehicle at a
steady speed (cruising), accelerating, etc. An OBD2 Drive Cycle
begins when the ignition key is turned “On” (when cold) and ends
when the vehicle has been driven in such a way as to have all the
“Enabling Criteria” met for all its applicable Monitors. Only those
trips that provide the Enabling Criteria for all Monitors applicable to
the vehicle to run and complete their individual diagnostic tests
qualify as an OBD2 Drive Cycle. OBD2 Drive Cycle requirements
vary from one model of vehicle to another. Vehicle manufacturers
set these procedures. Consult your vehicle’s service manual for
OBD2 Drive Cycle procedures.
Do not confuse a “Trip” Drive Cycle with an OBD2 Drive Cycle. A
“Trip” Drive Cycle provides the “Enabling Criteria” for one specific
Monitor to run and complete its diagnostic testing. An OBD2 Drive
Cycle must meet the “Enabling Criteria” for all Monitors on a
particular vehicle to run and complete their diagnostic testing.
Warm-up Cycle - Vehicle operation after an engine off period where
engine temperature rises at least 40°F (22°C) from its temperature
before starting, and reaches at least 160°F (70°C). The PCM uses
warm-up cycles as a counter to automatically erase a specific code
and related data from its memory. When no faults related to the
original problem are detected within a specified number of warm-up
cycles, the code is erased automatically.
DIAGNOSTIC TROUBLE CODES (DTCs)
Diagnostic Trouble Codes (DTCs) are
meant to guide you to the proper
service procedure in the vehicle’s
service manual. DO NOT replace parts
based only on DTCs without first
consulting the vehicle’s service manual
for proper testing procedures for that
particular system, circuit or component.
DTCs are alphanumeric codes that are used to identify a
problem that is present in any of the systems that are
monitored by the on-board computer (PCM). Each trouble
code has an assigned message that identifies the circuit,
component or system area where the problem was found.
OBD2 diagnostic trouble codes are made up of five characters:
The 1st character is a letter (B, C, P or U). It identifies the
“main system” where the fault occurred (Body, Chassis, Powertrain,
or Network).
The 2nd character is a numeric digit (0 thru 3). It identifies the
“type” of code (Generic or Manufacturer-Specific).
Generic DTCs are codes that are used by all vehicle manu-
facturers. The standards for generic DTCs, as well as their
definitions, are set by the Society of Automotive Engineers (SAE).
Diagnostic Trouble
Codes (DTCs) are
codes that identify a
specific problem area.

Onboard Diagnostics
DIAGNOSTIC TROUBLE CODES (DTCs)
10 ZR11
Manufacturer-Specific DTCs are codes that are controlled by
the vehicle manufacturers. The Federal Government does not
require vehicle manufacturers to go beyond the standardized
generic DTCs in order to comply with the new OBD2 emissions
standards. However, manufacturers are free to expand beyond
the standardized codes to make their systems easier to
diagnose.
The 3rd character is a letter or a numeric digit (0 thru 9, A thru F).
It identifies the specific system or sub-system where the problem is
located.
The 4th and 5th characters are letters or numeric digits (0 thru 9, A
thru F). They identify the section of the system that is malfunctioning.
P 0 2 0 1
B
C
P
U
-
-
-
-
Body
Chassis
Powertrain
Network
-
-
-
-
Generic
Manufacturer Specific
Generic ("P" Codes) and Manufacturer
Specific ("B", "C" and "U" Codes)
Includes both Generic and Manufacturer
Specific Codes
0
1
2
3
Identifies what section of the system
is malfunctioning
Identifies the system where the problem is
located. "P" Code systems are listed below.
"B", "C" and "U" Code systems will vary.
0
2
3
4
5
6
7
C
-
-
-
-
-
-
-
-
Fuel and Air Metering; Auxiliary Emission
1- Fuel and Air Metering
Controls
Fuel and Air Metering (injector circuit
malfunction only)
Ignition System or Misfire
Auxiliary Emission Control System
Vehicle Speed Control and Idle Control
System
Computer Output Circuits
Transmission
8- Transmission
9- Transmission
A- Hybrid Propulsion
B- Hybrid Propulsion
Hybrid Propulsion
OBD2 DTC EXAMPLE
P0201 - Injector Circuit Malfunction, Cylinder 1

Onboard Diagnostics
DIAGNOSTIC TROUBLE CODES (DTCs)
11
DTCs and MIL Status
When the vehicle’s on-board computer detects
a failure in an emissions-related component or
system, the computer’s internal diagnostic
program assigns a diagnostic trouble code
(DTC) that points to the system (and subsystem)
where the fault was found. The diagnostic
program saves the code in the computer’s
memory. It records a “Freeze Frame” of
conditions present when the fault was found, and lights the Malfunction
Indicator Lamp (MIL). Some faults require detection for two trips in a row
before the MIL is turned on.
The “Malfunction Indicator Lamp” (MIL) is the accepted term
used to describe the lamp on the dashboard that lights to warn
the driver that an emissions-related fault has been found.
Some manufacturers may still call this lamp a “Check Engine”
or “Service Engine Soon” light.
There are two types of DTCs used for emissions-related faults: Type “A”
and Type “B.” Type “A” codes are “One-Trip” codes; Type “B” DTCs are
usually Two-Trip DTCs.
When a Type “A” DTC is found on the First Trip, the following events
take place:
The computer commands the MIL “On” when the failure is first found.
If the failure causes a severe misfire that may cause damage to the
catalytic converter, the MIL “flashes” once per second. The MIL
continues to flash as long as the condition exists. If the condition
that caused the MIL to flash is no longer present, the MIL will light
“steady” On.
A DTC is saved in the computer’s memory for later retrieval.
A “Freeze Frame” of the conditions present in the engine or emissions
system when the MIL was ordered “On” is saved in the computer’s
memory for later retrieval. This information shows fuel system status
(closed loop or open loop), engine load, coolant temperature, fuel trim
value, MAP vacuum, engine RPM and DTC priority.
When a Type “B” DTC is found on the First Trip, the following events
take place:
The computer sets a Pending DTC, but the MIL is not ordered “On.”
“Freeze Frame” data may or may not be saved at this time
depending on manufacturer. The Pending DTC is saved in the
computer’s memory for later retrieval.
If the failure is found on the second consecutive trip, the MIL is
ordered “On.” “Freeze Frame” data is saved in the computer’s
memory.
If the failure is not found on the second Trip, the Pending DTC is
erased from the computer’s memory.
The MIL will stay lit for both Type “A” and Type “B” codes until one of
the following conditions occurs:

Onboard Diagnostics
OBD2 MONITORS
12 ZR11
If the conditions that caused the MIL to light are no longer present
for the next three trips in a row, the computer automatically turns the
MIL “Off” if no other emissions-related faults are present. However,
the DTCs remain in the computer’s memory as a history code for 40
warm-up cycles (80 warm-up cycles for fuel and misfire faults). The
DTCs are automatically erased if the fault that caused them to be
set is not detected again during that period.
Misfire and fuel system faults require three trips with “similar
conditions” before the MIL is turned “Off.” These are trips where the
engine load, RPM and temperature are similar to the conditions
present when the fault was first found.
After the MIL has been turned off, DTCs and Freeze Frame
data stay in the computer’s memory.
Erasing the DTCs from the computer’s memory can also turn off the
MIL. See ERASING DIAGNOSTIC TROUBLE CODES (DTCs) on
page 46, before erasing codes from the computer’s memory. If a
Diagnostic Tool or Scan Tool is used to erase the codes, Freeze
Frame data will also be erased.
OBD2 MONITORS
Currently, fifteen Monitors are supported by OBD2 systems. Additional
monitors may be added as a result of Government regulations as the
OBD2 system grows and matures. Not all vehicles support all fifteen
Monitors. Additionally, some Monitors are supported by “spark ignition”
vehicles only, while others are supported by “compression ignition”
vehicles only.
Monitor operation is either “Continuous” or “Non-Continuous,”
depending on the specific monitor.
Continuous Monitors
Three of these Monitors are designed to constantly monitor their
associated components and/or systems for proper operation.
Continuous Monitors run constantly when the engine is running. The
Continuous Monitors are:
Comprehensive Component Monitor (CCM)
Misfire Monitor
Fuel System Monitor
Non-Continuous Monitors
The other twelve Monitors are “non-continuous” Monitors. “Non-
continuous” Monitors perform and complete their testing once per trip.
The “non-continuous” Monitors are:
Oxygen Sensor Monitor
Oxygen Sensor Heater Monitor
Catalyst Monitor

Onboard Diagnostics
OBD2 MONITORS
13
Heated Catalyst Monitor
EGR System Monitor
EVAP System Monitor
Secondary Air System Monitor
The following Monitors became standard beginning in 2010.
The majority of vehicles produced before this time will not
support these Monitors
NMHC Monitor
NOx Adsorber Monitor
Boost Pressure System Monitor
Exhaust Gas Sensor Monitor
PM Filter Monitor
OBD2 Reference Table
The table below lists current OBD2 Monitors, and indicates the following
for each Monitor:
A. Monitor Type (how often does the Monitor run; Continuous or
Once per trip)
B. Number of trips needed, with a fault present, to set a pending DTC
C. Number of consecutive trips needed, with a fault present, to
command the MIL “On” and store a DTC
D. Number of trips needed, with no faults present, to erase a Pending
DTC
E. Number and type of trips or drive cycles needed, with no faults
present, to turn off the MIL
F. Number of warm-up periods needed to erase the DTC from the
computer’s memory after the MIL is turned off

Onboard Diagnostics
OBD2 MONITORS
14 ZR11
Name of
Monitor A B C D E F
Comprehensive
Component Monitor Continuous 1 2 1 3 40
Misfire Monitor
(Type 1 and 3) Continuous 121
3 - similar
conditions 80
Misfire Monitor
(Type 2) Continuous 1
3 - similar
conditions 80
Fuel System Monitor Continuous 1 1 or 2 1 3 - similar
conditions 80
Catalytic Converter
Monitor
Once per
trip 121
3 trips
40
Oxygen Sensor
Monitor
Once per
trip 121
3 trips
40
Oxygen Sensor
Heater Monitor
Once per
trip 121
3 trips
40
Exhaust Gas
Recirculation (EGR)
Monitor
Once per
trip 121
3 trips
40
Evaporative
Emissions Controls
Monitor
Once per
trip 121
3 trips
40
Secondary Air
System (AIR) Monitor
Once per
trip 121
3 trips
40
NMHC Monitor Once per
trip 121
3 trips
40
Nox Adsorber Monitor Once per
trip 121
3 trips
40
Boost Pressure
System Monitor
Once per
trip 121
3 trips
40
Exhaust Gas Sensor
Monitor
Once per
trip 121
3 trips
40
PM Filter Monitor Once per
trip 121
3 trips
40

Preparation for Testing
BEFORE YOU BEGIN
15
BEFORE YOU BEGIN
Mechanical problems such as low
oil level or damaged hoses, wiring
or electrical connectors can cause
poor engine performance and
may also cause a fault code to set.
Fix any known mechanical
problems before performing any
test. See your vehicle’s service manual or a mechanic for more information.
Check the following areas before starting any test:
Check the engine oil, power steering fluid, transmission fluid (if
applicable), engine coolant and other fluids for proper levels. Top off
low fluid levels if needed.
Make sure the air filter is clean and in good condition. Make sure all
air filter ducts are properly connected. Check the air filter ducts for
holes, rips or cracks.
Make sure all engine belts are in good condition. Check for cracked,
torn, brittle, loose or missing belts.
Make sure mechanical linkages to engine sensors (throttle, gearshift
position, transmission, etc.) are secure and properly connected. See
your vehicle’s service manual for locations.
Check all rubber hoses (radiator) and steel hoses (vacuum/fuel) for
leaks, cracks, blockage or other damage. Make sure all hoses are
routed and connected properly.
Make sure all spark plugs are clean and in good condition. Check
for damaged, loose, disconnected or missing spark plug wires.
Make sure the battery terminals are clean and tight. Check for
corrosion or broken connections. Check for proper battery and
charging system voltages.
Check all electrical wiring and harnesses for proper connection.
Make sure wire insulation is in good condition, and there are no bare
wires.
Make sure the engine is mechanically sound. If needed, perform a
compression check, engine vacuum check, timing check (if
applicable), etc.

Using the Code Reader
CODE RETRIEVAL PROCEDURE
16 ZR11
Retrieving and using Diagnostic Trouble Codes (DTCs) for
troubleshooting vehicle operation is only one part of an
overall diagnostic strategy.
CODE RETRIEVAL PROCEDURE
Never replace a part based only on the DTC definition.
Each DTC has a set of testing procedures, instructions and
flow charts that must be followed to confirm the location of
the problem. This information is found in the vehicle's
service manual. Always refer to the vehicle's service manual
for detailed testing instructions.
Check your vehicle thoroughly before performing
any test. See BEFORE YOU BEGIN on page 15 for
details.
ALWAYS observe safety precautions whenever working on a
vehicle. See IMPORTANT SAFETY INFORMATION on page 1
for more information.
1. Turn the ignition off.
2. Locate the vehicle's 16-pin Data Link
Connector (DLC). See page 2 for
connector location.
Some DLCs have a plastic cover
that must be removed before
connecting the Code Reader
cable connector.
If the Code Reader is ON, turn it
OFF by pressing the POWER/LINK
button BEFORE connecting
the Code Reader to the DLC.
3. Connect the Code Reader cable connector to the vehicle’s DLC.
The cable connector is keyed and will only fit one way.
If you have problems connecting the cable connector to the DLC,
rotate the connector 180° and try again.
If you still have problems, check the DLC on the vehicle and on
the Code Reader. Refer to your vehicle’s service manual to
properly check the vehicle’s DLC.
4. Turn the ignition on. DO NOT start the engine.
5. When the Code Reader’s cable connector is properly connected to
the vehicle’s DLC, the unit automatically turns ON.
If the unit does not power on automatically when connected to
the vehicle’s DLC connector, it usually indicates there is no
power present at the vehicle’s DLC connector. Check your fuse
panel and replace any burned-out fuses.

Using the Code Reader
CODE RETRIEVAL PROCEDURE
17
If replacing the fuse(s) does not correct the problem, consult your
vehicle’s repair manual to identify the proper computer (PCM)
fuse/circuit, and perform any necessary repairs before proceeding.
6. The Code Reader will automatically
start a check of the vehicle’s computer
to determine which type of
communication protocol it is using.
When the Code Reader identifies the
computer’s communication protocol, a
communication link is established.
If the Code Reader fails to link to the
vehicle’s computer, a “Communication
Error” message shows on the Code
Reader’s display.
- Ensure your vehicle is OBD2
compliant. See VEHICLES
COVERED on page 2 for vehicle
compliance verification information.
- Verify the connection at the DLC, and verify the ignition is ON.
- Turn the ignition OFF, wait 5 seconds, then back ON to reset
the computer.
- Press the POWER/LINK button to continue.
If the Code Reader cannot link to
the vehicle’s computer after three
attempts, the message “Contact
Technical Support” displays.
- Press the SYSTEM MENU
button to return to the System
Menu.
- Turn the ignition off, and
disconnect the Code Reader.
- Contact Technical Support for
assistance.
7. If the Code Reader can decode the
Vehicle Identification Number (VIN) for
the vehicle under test, the Vehicle
Information screen displays.
If the information shown is correct for the vehicle under test, use
the UP and DOWN buttons, as necessary, to highlight
Yes, then press the ENTER button. Proceed to step 10.
If the information shown is not correct for the vehicle under text,
or if you wish to manually select the vehicle, use UP and
DOWN buttons, as necessary, to highlight No, then press
the ENTER button. Proceed to step 8.

Using the Code Reader
CODE RETRIEVAL PROCEDURE
18 ZR11
If the Code Reader cannot decode the Vehicle Identification
Number (VIN) for the vehicle under test, the Select Vehicle
screen displays. Proceed to step 8.
8. When No is selected from the Vehicle
information screen, the Select Vehicle
screen displays. The Select Vehicle
screen lists the three most recently
tested vehicles.
To select a previously tested vehicle,
use the UP and DOWN
buttons, as necessary, to highlight
the desired vehicle, then press the
ENTER button. Proceed to step 10.
To select a new vehicle, use the UP
and DOWN buttons, as
necessary, to highlight New Vehicle,
then press the ENTER button.
Proceed to step 9.
9. When New Vehicle is chosen from the
Select Vehicle screen, the Select Year
screen displays.
Use the UP and DOWN
buttons, as necessary, to highlight
the desired vehicle model year, then
press the ENTER button to
continue. If necessary, select Next
to view additional options.
- The Select Make screen dis-
plays.
Use the UP and DOWN
buttons, as necessary, to highlight
the desired vehicle make, then
press the ENTER button to
continue. If necessary, select Next
to view additional options.
- The Select Model screen
displays.
Use the UP and DOWN
buttons, as necessary, to highlight
the desired vehicle model, then
press the ENTER button to
continue. If necessary, select Next
to view additional options.
-
The Select Engine screen
displays.