Jeep XJ. Manual - part 647
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
240
VEHICLE THEFT/SECURITY