immobilizer CHRYSLER VOYAGER 2001 User Guide

MEMORY SYSTEM VERIFICATION TEST - VER 1 APPLICABILITY
1. Reconnect all previously disconnected components and connectors.
2. If any Memory Seat Memory Module Trouble Codes are present, erase at this time.
3. With the Memory Switch on the Driver's Door, program the Driver's Seat #1 Button to a
desired position and Driver #2 Button to a different position.
4. Remove the Ignition Key and close all Doors to allow the Body Control Module to time out,
about 30 seconds.
5. Verify that both Memory positions can be recalled from the RKE transmitter and the
Memory Switch on the Driver's Door.
6. Turn the ignition on, and with the DRBIII, erase all Diagnostic Trouble Codes from ALL
modules. Start the engine and allow it to run for 2 minutes and fully operate the system that
was malfunctioning.
7. Turn the ignition off and wait 5 seconds. Turn the ignition on and using the DRBIII, read
DTC's from ALL modules.
Are any DTC's present or is the original complaint still present?All
Ye s®Repair is not complete, refer to appropriate symptom.
No®Repair is complete.
POWERTRAIN VERIFICATION TEST VER - 1 APPLICABILITY
1. NOTE: If the PCM has been replaced and the correct VIN and mileage have not
been programmed, a DTC will be set in the ABS Module, Airbag Module and the
SKIM.
2. NOTE: If the vehicle is equipped with a Sentry Key Immobilizer System, Secret
Key data must be updated. Refer to the Service Information for the PCM, SKIM and
the Transponder (ignition key) for programming information.
3. Inspect the vehicle to ensure that all components related to the repair are connected
properly.
4. Inspect the engine oil for fuel contamination. Replace the oil and filter as necessary.
5. Attempt to start the engine.
6. If the No Start condition is still present, refer to the symptom list and perform the diagnostic
testing as necessary. refer to and Technical Service Bulletins that may apply.
7. Run the engine for one warm-up cycle to verify operation.
8. With the DRBIIIt, confirm that no DTCs or Secondary Indicators are present and that all
components are functioning properly.
9. If a DTC is present, refer to the appropriate category and select the corresponding symptom.
Are any DTCs present?All
Ye s®Repair is not complete, refer to appropriate symptom.
No®Repair is complete.
992
VERIFICATION TESTS
Verification Tests ÐContinued

RIGHT SLIDING DOOR LOCK MOTOR (POWER SLIDING DOOR) - BLACK 4 WAYCAV CIRCUIT FUNCTION
1 P38 20TN/DB RIGHT SLIDING DOOR LOCK DRIVER
2 P34 20TN/LB RIGHT SLIDING DOOR UNLOCK DRIVER
3 Q34 20OR/GY RIGHT DOOR LOCK SENSE
4 Z76 20BK/YL GROUND
RIGHT SLIDING DOOR LOCK MOTOR/AJAR SWITCH (MANUAL SLIDING DOOR) - BLACK 4 WAYCAV CIRCUIT FUNCTION
1 P38 20BK/DB RIGHT SLIDING DOOR LOCK DRIVER
2 P34 20BK/TN RIGHT SLIDING DOOR UNLOCK DRIVER
3 G76 20BK/DG RIGHT SLIDING DOOR AJAR SWITCH SENSE
4 Z76 20BK GROUND
RIGHT SLIDING DOOR MOTOR (POWER SLIDING DOOR) - BLACK 8 WAYCAV CIRCUIT FUNCTION
1- -
2 Q72 20TN/VT RIGHT DOOR MOTOR HALL EFFECT SUPPLY
3 Q68 16TN/BR RIGHT SLIDING DOOR OPEN DRIVER
4 Z164 18BK/TN GROUND
5 Q64 18OR/TN RIGHT DOOR MOTOR CLUTCH DRIVER
6 Q70 16TN/OR RIGHT SLIDING DOOR CLOSE DRIVER
7 Z34 20BK/TN GROUND
8 Q74 20TN/YL RIGHT DOOR MOTOR HALL EFFECT SIGNAL
SENTRY KEY IMMOBILIZER MODULE - BLACK 6 WAYCAV CIRCUIT FUNCTION
1- -
2 D25 20WT/VT PCI BUS
3- -
4 F20 20PK/WT IGNITION SWITCH OUTPUT (RUN-START)
5 Z120 20BK/WT GROUND
6 A114 20GY/RD FUSED B(+) (I.O.D.)
SIREN (UNITED KINGDOM) - BLACK 4 WAYCAV CIRCUIT FUNCTION
1 D97 18WT/OR SIREN SIGNAL OUTPUT
2 D96 18WT/LB SIREN SIGNAL CONTROL
3 A600 18RD/LB SIREN SUPPLY
4 G944 18LB/BR SIREN SIGNAL RETURN
C
O
N
N
E
C
T
O
R
P
I
N
O
U
T
S
1083
CONNECTOR PINOUTS

TABLE OF CONTENTS - Continued
A/C COMPRESSOR CLUTCH RELAY......................................242
ECM/PCM RELAY (DIESEL).............................................242
FUEL HEATER RELAY (DIESEL)..........................................242
LIFT PUMP RELAY (DIESEL).............................................242
STARTER MOTOR RELAY...............................................242
RADIATOR FAN NO. 1 (DIESEL) - GRAY 2 WAY.............................242
RADIATOR FAN NO. 2 (DIESEL) - GRAY 2 WAY.............................243
RADIATOR FAN RELAY NO. 1 (DIESEL) - BLUE 9 WAY......................243
RADIATOR FAN RELAY NO. 2 (DIESEL) - BLUE 9 WAY......................243
RADIATOR FAN RELAY NO. 3 (DIESEL) - BLUE 9 WAY......................243
RIGHT SPEED CONTROL SWITCH - WHITE 2 WAY.........................244
SENTRY KEY IMMOBILIZER MODULE - BLACK 6 WAY......................244
VEHICLE SPEED SENSOR (MTX/ATX) - BLACK 3 WAY......................244
WATER IN FUEL SENSOR (DIESEL) - BLACK 2 WAY........................244
10.0 SCHEMATIC DIAGRAMS................................................245
10.12001 RG 2.5L TURBO DIESEL......................................245
11.0 CHARTS AND GRAPHS................................................247
vi

1.0 INTRODUCTION
The procedures contained in this manual include
all the specifications, instructions and graphics
needed to diagnose engine control module (ECM)
and sentry key immobilizer system (SKIS) prob-
lems; they are no start, diagnostic trouble code
(DTC), and no trouble code problems for the ECM.
The diagnostics in this manual are based on the
trouble condition or symptom being present at the
time of diagnosis.
When repairs are required, refer to the appropri-
ate service information for the proper removal and
repair procedure.
Diagnostic procedures change every year. New
diagnostic systems may be added; carryover sys-
tems may be enhanced. IT IS RECOMMENDED
THAT YOU REVIEW THE ENTIRE MANUAL TO
BECOME FAMILIAR WITH ALL NEW AND
CHANGED DIAGNOSTIC PROCEDURES.
This manual is designed to begin all diagnosis at
the DTC TEST, which is located at the beginning of
Section 7.0. This will cover all the necessary re-
quirements to begin a logical diagnostic path for
each problem. If there is a diagnostic trouble code
(DTC) detected, it will direct you to the trouble code
test. If there are no DTCs present, it will direct you
by symptom to a no trouble code test.
This book reflects many suggested changes from
readers of past issues. After using this book, if you
have any comments or recommendations, please fill
out the form at the back of the book and mail it back
to us.
1.1 SYSTEM COVERAGE
This diagnostic procedures manual covers all
2001 RG body vehicles equipped with the 2.5L VM
diesel engine.
1.2 SIX-STEP TROUBLESHOOTING
PROCEDURE
Diagnosis of the engine control module (ECM)
and sentry key immobilizer system (SKIS) is done
in six basic steps:
²verification of complaint
²verification of any related symptom
²symptom analysis
²problem isolation
²repair of isolated problem
²verification of proper operation
NOTE: All tests in this manual should be per-
formed with the engine at operating temperature,
unless specified within a particular test.
2.0 IDENTIFICATION OF
SYSTEM
The ECM is located in the left side of the engine
compartment between the left front headlamp and
the intelligent power module. The sentry key immo-
bilizer module (SKIM) is located below the steering
column behind the steering wheel.
3.0 SYSTEM DESCRIPTION AND
FUNCTIONAL OPERATION
3.1 GENERAL DESCRIPTION
The 2.5L VM diesel engine system is equipped
with the latest in technical advances. The on-board
diagnostics incorporated in the engine control mod-
ule and SKIM are intended to assist the field
technician in repairing vehicle problems by the
quickest means.
The engine system incorporates a common rail
fuel delivery design. This design utilizes electroni-
cally controlled solenoid valve type fuel injectors.
Each injector is controlled individually by the ECM.
Injector timing and fuel quantity are controlled by
the ECM based on inputs from the various sensors.
The precision control of the injectors by the ECM
helps to reduce the engine noise, odor and smoke.
3.2 FUNCTIONAL OPERATION
3.2.1 ECM ON-BOARD DIAGNOSTICS
The ECM has been programmed to monitor many
different circuits of the diesel fuel injection system.
This monitoring is called on-board diagnostics.
Certain criteria must be met for a trouble code to
be entered into the ECM memory. The criteria may
be a range of: engine rpm, engine temperature, time
or other input signals to the ECM. If all of the
criteria for monitoring a system or circuit are met,
and a problem is sensed, then a DTC will be stored
in the ECM memory.
It is possible that a DTC for a monitored circuit
may not be entered into the ECM memory, even
though a malfunction has occurred. This may hap-
pen when the monitoring criteria has not been met.
The ECM compares input signal voltages from
each input device with specifications (the estab-
lished high and low limits of the input range) that
are programmed into it for that device. If the input
voltage is not within the specifications and other
trouble code criteria are met, a DTC will be stored
in the ECM memory.
1
GENERAL INFORMATION

3.2.2 ECM OPERATING MODES
As input signals to the ECM change, the ECM
adjusts its response to the output devices. For
example, the ECM must calculate a different fuel
quantity and fuel timing for engine idle condition
than it would for a wide open throttle condition.
There are several different modes of operation that
determine how the ECM responds to the various
input signals.
Ignition Switch On (Engine Off)
When the ignition switch is turned on, the ECM
activates the glow plug relay for a time period that
is determined by engine coolant temperature, atmo-
spheric temperature and battery voltage. The ECM
also activates the lift pump to prime the fuel sys-
tem.
Engine Start-up Mode
The ECM uses the engine temperature sensor
and the crankshaft position sensor (engine speed)
inputs to determine fuel injection quantity.
Normal Driving Modes
Engine idle, warm-up, acceleration, deceleration
and wide open throttle modes are controlled based
on all of the sensor inputs to the ECM. The ECM
uses these sensor inputs to adjust fuel quantity and
fuel injector timing.
Overheat Protection Mode
If engine temperature is above 106É C (223É F)
and vehicle speed is above 40 km/h (25 MPH) the
ECM will activate the high speed fan and will limit
fuel quantity for engine protection.
Limp-In Mode
If there is a fault detected with the accelerator
pedal position sensor, the ECM will set the engine
speed at 1100 RPM.
Overspeed Detection Mode
If the ECM detects engine RPM that exceeds
5000 RPM, the ECM will set a DTC in memory and
limit engine RPM to no more that 2500 RPM until
the DTC(s) is cleared.
After-Run Mode
The ECM transfers RAM information to ROM
and performs an Input/Output state check.
3.2.3 MONITORED CIRCUITS
The ECM is able to monitor and identify most
driveability related trouble conditions. Some cir-
cuits are directly monitored through ECM feedback
circuitry. In addition, the ECM monitors the voltage
state of some circuits and compares those stateswith expected values. Other systems are monitored
indirectly when the ECM conducts a rationality test
to identify problems.
Although most subsystems of the engine control
module are either directly or indirectly monitored,
there may be occasions when diagnostic trouble
codes are not immediately identified. For a trouble
code to set, a specific set of conditions must occur
and unless these conditions occur, a DTC will not
set.
3.2.4 SKIS OVERIVEW
The sentry key immobilizer system (SKIS) is
designed to prevent unauthorized vehicle opera-
tion. The system consists of a sentry key immobi-
lizer module (SKIM), ignition key(s) equipped with
a transponder chip and the ECM. When the ignition
switch is turned on, the SKIM interrogates the
ignition key. If the ignition key is Valid or Invalid,
the SKIM sends a PCI Bus message to the ECM
indicating ignition key status. Upon receiving this
message the ECM will terminate engine operation
or allow the engine to continue to operate.
3.2.5 SKIS ON-BOARD DIAGNOSTICS
The sentry key immobilizer module (SKIM) has
been programmed to transmit and monitor many
different coded messages as well as PCI Bus mes-
sages. This monitoring is called On-Board Diagnos-
tics. Certain criteria must be met for a DTC to be
entered into SKIM memory. The criteria may be a
range of; input voltage, PCI Bus message or coded
messages to the SKIM. If all of the criteria for
monitoring a circuit or function are met and a fault
is detected, a DTC will be stored in the SKIM
memory.
3.2.6 SKIS OPERATION
When ignition power is supplied to the SKIM, the
SKIM performs an internal self-test. After the self-
test is complete, the SKIM energizes the antenna
(this activates the transponder chip) and sends a
challenge to the transponder chip. The transponder
chip responds to the challenge by generating an
encrypted response message using the following:
Secret Key - This is an electronically stored value
(identification number) that is unique to each SKIS.
The secret key is stored in the SKIM, ECM and all
ignition key transponders.
Challenge - This is a random number that is gen-
erated by the SKIM at each ignition key cycle.
The secret key and challenge are the two vari-
ables used in the algorithm that produces the
encrypted response message. The transponder uses
the crypto algorithm to receive, decode and respond
to the message sent by SKIM. After responding to
the coded message, the transponder sends a tran-
2
GENERAL INFORMATION

4.3 WARNINGS AND CAUTIONS
4.3.1 ROAD TEST WARNINGS
Some complaints will require a test drive as part
of the repair verification procedure. The purpose of
the test drive is to try to duplicate the diagnostic
code or symptom condition.
CAUTION: BEFORE ROAD TESTING A
VEHICLE, BE SURE THAT ALL
COMPONENTS ARE REASSEMBLED. DUR-
ING THE TEST DRIVE, DO NOT HANG THE
DRBIIITFROM THE REAR VIEW MIRROR. DO
NOT ATTEMPT TO READ THE DRBIIITWHILE
DRIVING. HAVE AN ASSISTANT AVAILABLE
TO OPERATE THE DRBIIIT.
4.3.2 VEHICLE DAMAGE CAUTIONS
Before disconnecting any control module, make
sure the ignition is off. Failure to do so could
damage the module. When testing voltage or circuit
integrity at any control module, use the terminal
side (not the wire end) of the harness connector. Do
not probe through the insulation; this will damage
it and eventually cause it to fail because of corro-
sion.
Be careful when performing electrical test so as to
prevent accidental shorting of terminals. Such a
mistake can damage fuses or components. Also, a
second code could be set, making diagnosis of the
original problem more difficult.
5.0 REQUIRED TOOLS AND
EQUIPMENT
DRBIIIt(diagnostic read-out box) scan tool
vacuum gauge
ammeter
ohmmeter
jumper wires and probes
oscilloscope
6.0 GLOSSARY OF TERMS
A/Cair conditioning
APPaccelerator pedal position (sensor)
backfire,
popbackfuel ignites in either the intake or
the exhaust system
BCMbody control module
BPboost pressure (sensor)CKPcrankshaft position (sensor)
CMPcamshaft position (sensor)
cuts out,
missesa steady pulsation or the inability of
the engine to maintain a consistent
rpm
DLCdata link connector
detona-
tion,
spark
knocka mild to severe ping, especially un-
der loaded engine conditions
ECMengine control module
ECTengine coolant temperature (sensor)
EGRexhaust gas recirculation
(solenoid/valve)
hard
startthe engine takes longer than usual
to start, even though it is able to
crank at normal speed.
IATintake air temperature (sensor)
IPMintelligent power module
lack of
power,
sluggishthe engine power output has been
reduced
MAFmass air flow (sensor)
MILmalfunction indicator lamp
msmillisecond(s)
PDCpower distribution center
poor fuel
economythere is significantly less fuel mile-
age than other vehicles of the same
design and configuration
runs
rough/
unstable
idlethe engine runs unevenly at idle
causing the engine to shake if it is
severe enough
S/Cspeed control
SKIMsentry key immobilizer module
SKISsentry key immobilizer system
start and
stallThe engine starts but immediately
dies (stalls)
surgeengine rpm fluctuation without cor-
responding change in accelerator
pedal position
SRCsignal range check
WIFwater in fuel (sensor)
VSSvehicle speed sensor
8
GENERAL INFORMATION

Symptom List:
P1685-SKIM SYSTEM INVALID KEY CODE RECEIVED
P1685-SKIM SYSTEM INVALID SECRET KEY IN EEPROM
P1685-SKIM SYSTEM KEY COMMUNICATION TIMED OUT
P1685-SKIM SYSTEM SKIM ERROR
P1685-SKIM SYSTEM WRITE ACCESS TO EEPROM FAILURE
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P1685-SKIM SYSTEM INVALID
KEY CODE RECEIVED.
When Monitored and Set Condition:
P1685-SKIM SYSTEM SKIM ERROR
When Monitored: With the ignition on and the immobilizer disarmed.
Set Condition: The ECM detects an open, short to ground, or short to voltage on the
immobilizer signal circuit.
P1685-SKIM SYSTEM WRITE ACCESS TO EEPROM FAILURE
When Monitored: With the ignition on.
Set Condition: The ECM determines that the coded message from the PCM does not
match the message programmed into memory.
POSSIBLE CAUSES
SKIM
INTERMITTENT CONDITION
CHECK FOR SKIM COMMUNICATION AND DTCS
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, check for Sentry Key Immobilizer Module communication and DTCs.
Are any SKIS problems or DTCs present?All
Ye s®Refer to symptom list for problems related to SKIM Communica-
tion and DTCs before continuing.
Perform ROAD TEST VERIFICATION - VER-2.
No®Go To 2
168
DRIVEABILITY - DIESEL

POSSIBLE CAUSES
SKIM INTERNAL DTC FAILURE
TEST ACTION APPLICABILITY
1Note: This trouble code indicates an internal SKIM fault.
With the DRBIIIt, read and record the SKIM DTCs and then erase the SKIM DTCs
Perform 10 ignition key cycles, leaving the ignition key on for a minimum of 90
seconds per cycle.
With the DRBIIIt, read the SKIM DTCs.
Did the same SKIM DTC return?All
Ye s®Replace and program the Sentry Key Immobilizer Module in
accordance with the Service Information.
Perform SKIS VERIFICATION.
No®Test Complete.
215
VEHICLE THEFT/SECURITY
ANTENNA FAILURE ÐContinued

TEST ACTION APPLICABILITY
2NOTE: Ensure that a VIN has been programmed into the PCM. If a VIN is not
displayed, attempt to program the PCM with the correct vehicle VIN before
continuing.
Turn the ignition on.
With the DRBIIIt, select Engine system from the main menu.
Display and record the Vehicle Identification Number.
Does the VIN recorded from the PCM match the VIN of the vehicle?All
Ye s®Go To 3
No®Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform SKIS VERIFICATION.
3 Turn the ignition off.
Replace and program the Sentry Key Immobilizer Module in accordance with the
Service Information.
Turn the ignition on.
With the DRBIIIt, display and clear all PCM and SKIM DTC's.
Perform 5 ignition key cycles leaving the ignition key on for 90 seconds per cycle.
With the DRBIIIt, check for SKIM DTC's.
Does the DRBIIItdisplay the same DTC?All
Ye s®Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform SKIS VERIFICATION.
No®Test Complete.
4 Turn the ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
NOTE: Visually inspect the related wiring harness connectors. Look for
broken, bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Were any problems found?All
Ye s®Repair wiring harness/connectors as necessary.
Perform SKIS VERIFICATION.
No®Test Complete.
219
VEHICLE THEFT/SECURITY
ROLLING CODE FAILURE ÐContinued

TEST ACTION APPLICABILITY
1 With the DRBIIIt, read and record the SKIM DTCs.
With the DRBIIIt, erase the SKIM DTCs.
NOTE: Perform the following test several times to ensure the DTC is
current.
Turn the ignition off.
Wait 10 seconds.
Turn the ignition on.
With the DRBIIIt, read the SKIM DTCs.
Does the DRBIIItdisplay the DTC that was previously erased?All
Ye s®Go To 2
No®Go To 7
2 Are there multiple vehicle ignition keys available? All
Ye s®Go To 3
No®Go To 4
3NOTE: Perform the following steps using one of the vehicle ignition keys.
When finished, repeat the procedure using each of the other vehicle keys
one at a time.
With the DRBIIIt, erase the SKIM DTC's.
Turn the ignition off.
Wait 10 seconds.
Turn the ignition on.
With the DRBIIIt, read the SKIM DTC's.
Is the DTC present for all ignition keys?All
Ye s®Replace the Sentry Key Immobilizer Module in accordance with
the Service Information.
Perform SKIS VERIFICATION.
No®Test Complete.
4 With the DRBIIIt, attempt to reprogram the ignition keys to the SKIM.
With the DRBIIIt, erase the SKIM DTC's.
Wait 10 seconds.
Turn the ignition on.
With the DRBIIIt, read the SKIM DTC's.
Does the DTC reset?All
Ye s®Go To 5
No®Test Complete.
5 Replace the ignition key with a new key.
With the DRBIIIt, program the new ignition key to the SKIM.
With the DRBIIIt, erase the SKIM DTC's
Turn the ignition off.
Wait 10 seconds.
Turn the ignition on.
With the DRBIIIt, read the SKIM DTC's.
Does the DTC reset?All
Ye s®Go To 6
No®Test Complete.
221
VEHICLE THEFT/SECURITY
TRANSPONDER COMMUNICATION FAILURE ÐContinued