In-Car Temperature Sensor Failure

Test 1 - 3:

Test 4 - 8:

Test 9 - 13:

Test 14 - 15:

SYMPTOM
IN-CAR TEMPERATURE SENSOR FAILURE

WHEN MONITORED
With ignition ON.

SET CONDITION
When the BCM senses an abnormally high voltage (above 4.8 volts) or an abnormally low voltage (below 0.313 volts) in the in-car temperature input.

POSSIBLE CAUSES
- BCM-aspirator stays running
- IN-CAR TEMP sensor signal short to voltage
- System is operational at this time
- Fused B(+) circuit open
- Sensor ground wire open
- Aspirator motor driver circuit open
- Aspirator motor driver circuit short to battery
- Aspirator motor driver circuit short to ground
- IN-CAR temperature sensor signal circuit open
- IN-CAR temperature sensor signal circuit short to ground
- ATC head - open aspirator motor
- ATC head - IN-CAR sensor code
- IN-CAR temperature sensor signal circuit short to sensor ground
- Body control module - aspirator driver open
- Body control module - open IN-CAR TEMP sensor signal
- Body control module - open sensor ground