Serial Link External Fault

Tests 946 - 949:

SYMPTOM
SERIAL LINK EXTERNAL FAULT

TEST NOTE
This symptom is diagnosed using the test PCM STATUS FAILURE.

WHEN MONITORED
At ignition ON, after ignition ON during any rolling code handshake that occurs with the PCM due to a SKIM reset or a PCM reset, or during 'Secret Key' transfers to the PCM.

SET CONDITION
This condition is set when the SKIM does not receive an expected bus message transmission acknowledgment from the PCM after 3 transmit attempts.

POSSIBLE CAUSES
- Intermittent wiring harness problem
- Wiring harness inspection
- SKIM/PCM defective