ECU CHRYSLER VOYAGER 2001 Service Manual

Symptom:
P0740-TORQ CONV CLU, NO RPM DROP AT LOCKUP (3SP AUTO
TRANS)
When Monitored and Set Condition:
P0740-TORQ CONV CLU, NO RPM DROP AT LOCKUP (3SP AUTO TRANS)
When Monitored: Run in third with converter unlocked for 10 seconds, apply throttle
until it locks then run for 5 seconds, vehicle speed less than 60 MPH. No DTCs set for: TCC
solenoids, any cam/crank conditions, VSS, TPS signal, TPS voltage too high or too low.
Set Condition: Torque converter malfunctions are detected when it does not lock or
unlock properly. Two consecutive trips that fail will store the code. Mountainous terrain
may cause this trouble code.
POSSIBLE CAUSES
INTERMITTENT CONDITION
DTCS PRESENT
TRANSMISSION FLUID
TIRE AND WHEEL SIZE
FUSED IGNITION OUTPUT CIRCUIT
TCC SOLENOID
TCC ASSEMBLY OR TCC SOLENOID STUCK
TCC SOLENOID OPERATION
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, read DTC's.
Is the Good Trip Counter displayed and equal to zero?All
Ye s®Go To 2
No®Go To 9
165
DRIVEABILITY - GAS

Symptom:
P1391-INTERMITTENT LOSS OF CMP OR CKP
When Monitored and Set Condition:
P1391-INTERMITTENT LOSS OF CMP OR CKP
When Monitored: Engine running or cranking.
Set Condition: When the failure counter reaches 20 for 2 consecutive trips.
POSSIBLE CAUSES
WIRING HARNESS INSPECTION
TONE WHEEL/PULSE RING INSPECTION
WIRING HARNESS INSPECTION
TONE WHEEL/PULSE RING INSPECTION
CHECKING INTERMITTENT CKP SIGNAL WITH LAB
CHECKING INTERMITTENT CMP SIGNAL WITH LAB
CHECKING INTERMITTENT CKP WIRING WITH LAB SCOPE
CHECKING INTERMITTENT CMP WIRING WITH LAB SCOPE
INTERMITTENT CONDITION
CAMSHAFT POSITION SENSOR
CRANKSHAFT POSITION SENSOR
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, read DTC's.
Is the Good Trip displayed and equal to zero?All
Ye s®Go To 2
No®Go To 10
2 Turn the ignition off.
With the DRBIIItlab scope probe and the Miller special tool #6801, backprobe the
CMP Signal circuit in the CMP harness connector.
WARNING: KEEP CLEAR OF THE ENGINE'S MOVING PARTS.
Start the engine.
Observe the lab scope screen.
Are there any irregular or missing signals?All
Ye s®Go To 3
No®Go To 6
201
DRIVEABILITY - GAS

Symptom:
*ENGINE CRANKS DOES NOT START
POSSIBLE CAUSES
FUEL PUMP RELAY
NO START PRE-TEST
POWERTRAIN FUSES OPEN
FUEL PRESSURE OUT OF SPECS
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
FUEL PUMP MODULE
FUEL PUMP CAPACITY (VOLUME) OUT OF SPECS
FUEL PUMP RELAY FUSED B+ CIRCUIT
OTHER POSSIBLE CAUSES FOR NO START
FUEL PUMP RELAY OUTPUT CIRCUIT OPEN
FUEL PUMP GROUND CIRCUIT OPEN/HIGH RESISTANCE
IPM FUSE & RELAY CENTER
FUEL PUMP MODULE
TEST ACTION APPLICABILITY
1Note: The following list of items must be checked before continuing with
any no start tests.
The battery must be fully charged and in good condition. A low charged battery may
produce invalid test results. If the battery is low, charge the battery and then attempt
to start the vehicle by cranking the engine for 15 seconds, 3 consecutive times.
This will allow any DTC's to set that may have been erased due to a dead battery.
Ensure the Powers and Ground to the PCM are ok.
Make sure the PCM communicates with the DRB and that there are no DTC's stored
in the PCM memory. If the PCM reports a No Response condition, refer to the
Communication category for the proper tests.
Read the PCM DTC's with the DRB. If any DTC's are present, they must be repaired
before continuing with any other No Start diagnostic tests. Refer to the Symptom list
for the related P-code that is reported by the PCM.
Ensure that the PCI bus is functional. Attempt to communicate with the Instrument
Cluster and SKIM, If you are unable to establish communicate refer to the
Communication category for the proper symptoms.
The Sentry Key Immobilizer System must be operating properly. Check for proper
communication with the DRB and check for DTC's that may be stored in the Sentry
Key Immobilizer Module (SKIM). repair the DTC(s) before continuing.
If no DTC's are found, using the DRB select Clear PCM (Batt Disconnect).
Crank the engine several times. Using the DRB, read DTC's. If a DTC is present
perform the DTC diagnostics before continuing.
Were any problems found?All
Ye s®Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER-1.
No®Go To 2
253
STARTING

Symptom List:
ANTENNA FAILURE
COP FAILURE
EEPROM FAILURE
INTERNAL FAULT
RAM FAILURE
SERIAL LINK INTERNAL FAULT
STACK OVERFLOW FAILURE
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be ANTENNA FAILURE.
When Monitored and Set Condition:
ANTENNA FAILURE
When Monitored: Every 250 milliseconds with the ignition on.
Set Condition: The SKIM's microcontroller determines that an antenna circuit fault has
occurred for 2.0 consecutive seconds.
COP FAILURE
When Monitored: With the ignition on.
Set Condition: The COP timer is not reset by the microcontroller every 65.5 milliseconds
EEPROM FAILURE
When Monitored: With the ignition on.
Set Condition: When the value written to EEPROM memory does not equal the value
read back after the write operation.
INTERNAL FAULT
When Monitored: With the ignition on.
Set Condition: The SKIM has detected a fault during an internal self test.
RAM FAILURE
When Monitored: With the ignition on.
Set Condition: The RAM fails a test that checks the RAM's ability to retain memory.
SERIAL LINK INTERNAL FAULT
When Monitored: With the ignition on.
Set Condition: The SKIM fails an internal J1850 communication self test.
STACK OVERFLOW FAILURE
When Monitored: With the ignition on.
Set Condition: The microcontroller has exceeded its stack space limit.
266
VEHICLE THEFT/SECURITY

POSSIBLE CAUSES
SKIM INTERNAL DTC FAILURE
TEST ACTION APPLICABILITY
1Note: This trouble code indicates an internal SKIM fault.
With the DRB III, 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 DRB III, 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 TEST.
No®Test Complete.
267
VEHICLE THEFT/SECURITY
ANTENNA FAILURE ÐContinued

Symptom List:
PCM STATUS FAILURE
SERIAL LINK EXTERNAL FAULT
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be PCM STATUS FAILURE.
When Monitored and Set Condition:
PCM STATUS FAILURE
When Monitored: With the ignition on.
Set Condition: This DTC exists when a PCM STATUS message was not received from the
PCM for at least 20.0 consecutive seconds.
SERIAL LINK EXTERNAL FAULT
When Monitored: At ignition on, after ignition on during any rolling code handshake that
occurs with the PCM due to a SKIM reset, or during SECRET KEY transfers to the PCM.
Set Condition: When the SKIM does not receive an expected PCI BUS message trans-
mission acknowledgement from the PCM after 3 transmit attempts.
POSSIBLE CAUSES
INTERMITTENT WIRING HARNESS PROBLEM
WIRING HARNESS INSPECTION
SKIM/PCM
TEST ACTION APPLICABILITY
1NOTE: Ensure the PCM has proper power and ground connections before
continuing.
With the DRB III, read and record the SKIM DTC's then erase the SKIM DTC's.
Turn the ignition off.
Wait 2 minutes.
Turn the ignition on.
With the DRB III, read the SKIM DTC's.
Does the DRB III display the DTC that was previously erased?All
Ye s®Go To 2
No®Go To 4
268
VEHICLE THEFT/SECURITY

TEST ACTION APPLICABILITY
2 Turn the ignition off.
NOTE: Visually inspect the related wiring harness and CCD/PCI Bus
(whichever applicable) circuits. 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 as necessary.
Perform SKIS VERIFICATION TEST.
No®Go To 3
3NOTE: Before proceeding it will be necessary to obtain the SKIM PIN
number.
Turn the ignition on.
With the DRB III, display and erase all PCM and SKIM DTC's.
Perform 5 ignition key cycles, leaving the ignition key on for a minimum of 90 seconds
per cycle.
With the DRB III, read the SKIM DTC's.
Does the code appear?All
Ye s®Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform SKIS VERIFICATION TEST.
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.
No®Test Complete.
269
VEHICLE THEFT/SECURITY
PCM STATUS FAILURE ÐContinued

Symptom:
ROLLING CODE FAILURE
When Monitored and Set Condition:
ROLLING CODE FAILURE
When Monitored: At ignition on, after ignition on during any rolling code handshake that
occurs with the PCM due to a SKIM or PCM reset.
Set Condition: When a PCM STATUS message with a Valid Key status is not received by
the SKIM within 3.5 seconds of transmitting the last Valid Key Code message to the PCM.
POSSIBLE CAUSES
VERIFYING PCM VIN
INTERMITTENT WIRING HARNESS PROBLEM
PCM
TEST ACTION APPLICABILITY
1 With the DRB III, erase the SKIM DTC's.
Turn the ignition off.
Wait 10 seconds.
Turn the ignition on and wait 2 minutes.
With the DRB III, read the SKIM DTC's.
Does the DRB III display the DTC that was previously erased?All
Ye s®Go To 2
No®Go To 4
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 DRB III, 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.
270
VEHICLE THEFT/SECURITY

TEST ACTION APPLICABILITY
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 DRB III, 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 DRB III, check for SKIM DTC's.
Does the DRB III display the same DTC?All
Ye s®Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform SKIS VERIFICATION TEST.
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 TEST.
No®Test Complete.
271
VEHICLE THEFT/SECURITY
ROLLING CODE FAILURE ÐContinued

Symptom List:
TRANSPONDER COMMUNICATION FAILURE
TRANSPONDER CYCLIC REDUNDANCY CHECK (CRC) FAILURE
TRANSPONDER ID MISMATCH
TRANSPONDER RESPONSE MISMATCH
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be TRANSPONDER COMMUNICA-
TION FAILURE.
When Monitored and Set Condition:
TRANSPONDER COMMUNICATION FAILURE
When Monitored: At ignition on and during Key Programming Mode.
Set Condition: When the SKIM does not receive a transponder response after 8 consec-
utive transponder read attempts within 2.0 seconds.
TRANSPONDER CYCLIC REDUNDANCY CHECK (CRC) FAILURE
When Monitored: At ignition on and during Key Programming Mode.
Set Condition: When 5 consecutive transponder signal transmissions are sent to the
SKIM with the correct message format but with invalid data.
TRANSPONDER ID MISMATCH
When Monitored: At ignition on and during Key Programming Mode.
Set Condition: When the transponder ID read by the SKIM does not match any of the
transponder ID's stored in the SKIM's memory.
TRANSPONDER RESPONSE MISMATCH
When Monitored: At ignition on and during Key Programming Mode.
Set Condition: When the transponder's crypto algorithm result fails to match the SKIM's
result.
POSSIBLE CAUSES
CHECKING MULTIPLE KEY OPERATION
SKIM
INTERMITTENT WIRING HARNESS PROBLEM
REPLACE IGNITION KEY
272
VEHICLE THEFT/SECURITY