Manufacturer Code Charts: 9

HVAC DTC Troubleshooting: 9

DTC indicator 9:

A Short in the Evaporator Temperature Sensor Circuit

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

2. Do the Self-Diagnostic Function with the HVAC control unit How To Troubleshoot The Heating And A/C Systems.

3. Check for DTCs.

Is DTC 9 indicated?

YES -

Go to step 4.

NO -

Intermittent failure. Check for damaged wires or connections in 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 -

With the evaporator temperature sensor disconnected, 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 body ground and HVAC control unit 24P connector terminals No. 2 and No. 13 individually.





Is there continuity?

YES -

Repair a short to body ground in the wire(s) between the HVAC control unit and the evaporator temperature sensor.�

NO -

Go to step 8.

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





Is there continuity?

YES -

Repair a 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 HVAC Control Unit Removal/Installation (With A/C).�