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

Tests 1 - 3:

Tests 4 - 7:

Tests 8 - 9:

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

POSSIBLE CAUSES
- No response - PCI bus - front control module
- CMTC bus message failure
- Compass mini-trip computer
- Ambient temperature sensor
- Ambient temperature sensor signal circuit short to sensor circuit
- Ambient temperature sensor signal circuit short to ground
- Ambient temperature sensor signal circuit open
- Ambient temperature sensor return circuit open
- Intelligent power module
- Front control module