BUS Messages Missing

Test 1 - 3:

Test 4:

SYMPTOM
BUS MESSAGES MISSING

WHEN MONITORED
When the ignition is On.

SET CONDITION
The CMTC detects no ambient temperature message on the PCI bus. The CMTC will display ( - - ).

POSSIBLE CAUSES
- No Response From CMTC
- Intermittent Condition
- No Response - PCI BUS - PCM
- No Response - PCI BUS - BCM
- Compass Mini-trip Computer