Serial Link External Fault

Test 1:

Tests 2 - 4:

SYMPTOM
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
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 transmission acknowledgement from the PCM after 3 transmit attempts.

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