Chrysler Town, Dodge Caravan. Manual — part 667
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
476
SENTRY KEY IMMOBILIZER
TEST
ACTION
APPLICABILITY
1
With the DRBIII
t, read and record the SKIM DTCs.
With the DRBIII
t, 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 DRBIII
t, read the SKIM DTCs.
Does the DRBIII
t display the DTC that was previously erased?
All
Yes
→ Go To 2
No
→ Go To 7
2
Are there multiple vehicle ignition keys available?
All
Yes
→ Go To 3
No
→ Go To 4
3
NOTE: 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 DRBIII
t, erase the SKIM DTCs.
Turn the ignition off.
Wait 10 seconds.
Turn the ignition on.
With the DRBIII
t, read the SKIM DTCs.
Is the DTC present for all ignition keys?
All
Yes
→ Replace and program the Sentry Key Immobilizer Module in
accordance with the Service Information.
Perform SKIS VERIFICATION.
No
→ Replace the ignition key(s) that cause the SKIM DTC.
Perform SKIS VERIFICATION.
4
With the DRBIII
t, attempt to reprogram the ignition keys to the SKIM.
With the DRBIII
t, erase the SKIM DTCs.
Wait 10 seconds.
Turn the ignition on.
With the DRBIII
t, read the SKIM DTCs.
Does the DTC set again?
All
Yes
→ Go To 5
No
→ Test Complete.
5
Replace the ignition key with a new key.
With the DRBIII
t, program the new ignition key to the SKIM.
With the DRBIII
t, erase the SKIM DTCs.
Turn the ignition off.
Wait 10 seconds.
Turn the ignition on.
With the DRBIII
t, read the SKIM DTCs.
Does the DTC set again?
All
Yes
→ Go To 6
No
→ Test Complete.
477
SENTRY KEY IMMOBILIZER
TRANSPONDER COMMUNICATION FAILURE —
Continued
TEST
ACTION
APPLICABILITY
6
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Sentry Key Immobilizer Module in
accordance with the Service Information.
Perform SKIS VERIFICATION.
7
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
Yes
→ Repair wiring harness/connectors as necessary.
Perform SKIS VERIFICATION.
No
→ Test Complete.
478
SENTRY KEY IMMOBILIZER
TRANSPONDER COMMUNICATION FAILURE —
Continued
Symptom:
*CHECKING FUEL DELIVERY
POSSIBLE CAUSES
FUEL PUMP RELAY
FUEL PRESSURE OUT OF SPECS
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
FUEL PUMP MODULE
FUEL DELIVERY SYSTEM OPERATION
FUEL PUMP RELAY FUSED B+ CIRCUIT
(A141) FUEL PUMP RELAY OUTPUT CIRCUIT OPEN
(Z1) FUEL PUMP GROUND CIRCUIT OPEN/HIGH RESISTANCE
FUEL PUMP MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, actuate the ASD Fuel System test.
Note: It may be necessary to use a mechanics stethoscope in the next step.
Listen for fuel pump operation at the fuel tank.
Does the Fuel Pump operate?
All
Yes
→ Go To 2
No
→ Go To 5
Caution: Stop All Actuations.
2
Turn the ignition off.
WARNING: The fuel system is under a constant pressure even with the
engine off. Before testing or servicing any fuel system hose, fitting or line,
the fuel system pressure must be released.
Install a fuel gauge.
Turn the ignition on.
With the DRBIII
t, actuate the ASD Fuel System test and observe the fuel pressure
gauge.
NOTE: Fuel pressure specification is 400 KPa +/- 34 KPa (58 psi +/- 5 psi).
Choose a conclusion that best matches your fuel pressure reading.
All
Below Specification
Within Specification
The Fuel Delivery System is operating normally.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
Above Specification
Replace the fuel filter/fuel pressure regulator.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
Caution: Stop All Actuations.
479
STARTING
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