DTC 9

DTC indicator 9: A Short in the Evaporator Temperature Sensor Circuit

1. Clear the DTC.
2. Turn the ignition switch to LOCK (0), and then turn to ON (II).
3. Do the self-diagnostic with the HVAC control unit.
4. Check for DTCs.

Is DTC 9 indicated?

YES - Go to step 5.

NO - Intermittent failure.

5. Turn the ignition switch to LOCK (0).
6. Remove the evaporator temperature sensor and test it.

Is the evaporator temperature sensor OK?

YES - Go to step 7.

NO - Replace the evaporator temperature sensor.

7. Disconnect the HVAC control unit 24P connector.
8. Check for continuity between body ground and the HVAC control unit 24P connector No. 2 and No. 13 terminals individually.






Is there continuity?

YES - Repair short to body ground in the wires between the HVAC control unit and the evaporator temperature sensor.

NO - Go to step 9.

9. Check for continuity between the HVAC control unit 24P connector No. 2 and No. 13 terminals.






Is there continuity?

YES - Repair short in the wires between the HVAC control unit and the evaporator temperature sensor.

NO - Substitute a known-good HVAC control unit, and recheck. If the symptom/indication goes away, replace the original HVAC control unit.