PCM Messages Not Received (Export)

Test 1 - 3:

SYMPTOM
PCM MESSAGES NOT RECEIVED (EXPORT ONLY)

WHEN MONITORED
Continuously with the ignition on.

SET CONDITION
The Thatcham Alarm Module does not receive any messages from the PCM for at least 5 seconds.

POSSIBLE CAUSES
- Intermittent condition
- PCM communication failure
- PCI bus circuit open
- Thatcham alarm module - internal malfunction