B1031

B1031-EVAPORATOR FIN TEMPERATURE SENSOR CIRCUIT LOW





For a complete wiring diagram refer to the Wiring Information. Electrical Diagrams

- When Monitored:
With the ignition on.

- Set Condition:
If the Evaporator Temperature Sensor input is out of range toward the low voltage threshold.





1. VERIFY B1031-EVAPORATOR FIN TEMPERATURE SENSOR CIRCUIT LOW IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, erase the DTCs.
3. Turn the ignition off, wait 10 seconds and turn the ignition on.
4. With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded or contaminated terminals. Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK FOR DTC WITH THE EVAPORATOR TEMPERATURE SENSOR HARNESS CONNECTOR DISCONNECTED
1. Turn the ignition off.
2. Disconnect the Evaporator Temperature Sensor harness connector.
3. Turn the ignition on.
4. With the scan tool, erase the DTCs.
5. Turn the ignition off, wait 10 seconds, and turn the ignition on.
6. With the scan tool, read the DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 3.

No

- Replace the Evaporator Temperature Sensor.
- Perform BODY VERIFICATION TEST. Body Verification Test.

3. CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the Instrument Cluster (CCN) C3 harness connector.
3. Measure the resistance between ground and the (C21) Evaporator Temperature Sensor Signal circuit and ground.

Does the ohm meter read open circuit?

Yes

- Replace the Instrument Cluster (CCN).
- Perform BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the (C21) Evaporator Temperature Sensor Signal circuit for a short to ground.