Manufacturer Code Charts: 8

HVAC DTC Troubleshooting: 8

DTC indicator 8: An Open in the Evaporator Temperature Sensor Circuit

1. Turn the ignition switch to LOCK (0), and then turn it to ON (II).

2. Do the Self-diagnostic Function with the HVAC control unit. Reading and Clearing Diagnostic Trouble Codes

3. Check for DTCs.

Is DTC 8 indicated?
YES - Go to step 4.

NO - Intermittent failure. Check for loose wires or poor connections on the evaporator temperature sensor circuit.


4. Turn the ignition switch to LOCK (0).

5. Remove the evaporator temperature sensor Service and Repair and test it. Evaporator Temperature Sensor Test

Is the evaporator temperature sensor OK?
YES - Go to step 6.

NO - Replace the evaporator temperature sensor. Service and Repair


6. Disconnect the HVAC control unit 24P connector.

7. Check for continuity between HVAC control unit 24P connector terminal No. 2 and evaporator temperature sensor 2P connector terminal No. 2.

Is there continuity?
YES - Go to step 8.

NO - Repair an open in the wire between the HVAC control unit and the evaporator temperature sensor.






8. Check for continuity between HVAC control unit 24P connector terminal No. 13 and evaporator temperature sensor 2P connector terminal No. 1.

Is there continuity?
YES - Check for loose wires or poor connections at the HVAC control unit 24P connector and at the evaporator temperature sensor 2P connector. If the connections are good, substitute a known-good HVAC control unit, and recheck. If the symptom/indication goes away, replace the original HVAC control unit.

NO - Repair an open in the wire between the HVAC control unit and the evaporator temperature sensor.