Stored Transponder CRC Fail, Comm ID or Response Mismatch

NAME OF CODE
Transponder (Cyclic Redundancy Check) CRC Failure

WHEN MONITORED
At ignition ON and during key programming mode.

SET CONDITION
This failure condition exists when five consecutive transponder signal transmissions are sent to the SKIM with the correct message format but with invalid data.

THEORY OF OPERATION
At ignition ON or during key programming, if properly formatted, invalid data is received from the transponder during five consecutive transponder read attempts, a TRANSPONDER CRC FAILURE will be logged.

POSSIBLE CAUSES
- Damaged transponder
- Invalid Key
- Electromagnetic Noise
- Defective Sentry Key Immobilizer Module




NAME OF CODE
Transponder Communication Failure

WHEN MONITORED
At ignition ON and during Key Programming Mode.

SET CONDITION
This failure condition exists when an invalid message format is received from the transponder after five consecutive transponder read attempts.

THEORY OF OPERATION
At ignition ON or during key programming, the SKIM module performs a communication process with the transponder. The SKIM attempts powering up the transponder and activates the secret algorithm within the transponder. The transponder then sends a response to the SKIM. If the response is formatted correctly, the communication process between the SKIM and the transponder is continued. If the response is not formatted correctly, after five consecutive reads, no further communication attempts are made. This code is set and the engine will start, run for approximately two seconds, then stall.

POSSIBLE CAUSES
- Damaged transponder (key)
- Invalid Key (no transponder/wrong transponder
- Electromagnetic Noise
- Defective Sentry Key Immobilizer Module




NAME OF CODE
Transponder ID Mismatch

WHEN MONITORED
At ignition ON and during Key Programming Mode.

SET CONDITION
This failure condition exists when the transponder ID read by the SKIM does not match any of those transponder ID's stored in the SKIM's memory.

THEORY OF OPERATION
At ignition ON or during key programming, the SKIM performs a communication process with the transponder. The SKIM attempts powering up the transponder and activates the secret algorithm within the transponder. Upon receipt of a properly formatted secret algorithm response, the SKIM verifies that the response is correct. If the response is correct, it attempts to power up the transponder and tries to read the transponder ID. The SKIM verifies the transponder ID format and makes sure that the ID matches one that has been previously learned. If the ID does not match at this point, this code will set.

POSSIBLE CAUSES
- Damaged transponder
- Key not learned to SKIM
- Defective Sentry Key Immobilizer Module



NAME OF CODE
Transponder Response Mismatch

WHEN MONITORED
At ignition ON and during Key Programming Mode.

SET CONDITION
This condition exists when the transponder's secret algorithm result fails to match the SKIM's result.

THEORY OF OPERATION
At ignition ON or during key programming, the SKIM performs a communication process with the transponder. The SKIM attempts powering up the transponder and activates the secret algorithm within the transponder and activates the secret algorithm within the transponder. Upon receipt of a properly formatted secret algorithm response, the SKIM verifies that the response is correct. If the response is incorrect, then this code will be set.

POSSIBLE CAUSES
- Damaged transponder Key not learned to SKIM
- Defective Sentry Key Immobilizer Module