Repairing CMTC Displays Double Dash (- -) In Temp Display

Tests 1 - 3:

Tests 4 - 7:

Test 8:

SYMPTOM
REPAIRING CMTC DISPLAYS DOUBLE DASH (- -) IN TEMP DISPLAY

POSSIBLE CAUSES
- No response - PCI bus HVAC
- CMTC bus message failure
- Compass mini-trip computer
- Ambient temperature sensor
- Ambient temperature sensor signal circuit short to sensor ground circuit
- Ambient temperature sensor signal circuit short to ground
- Ambient temperature sensor signal circuit open
- Ambient temperature sensor ground circuit open
- A/C - heater control