HVAC

HVAC DTC Troubleshooting: 14

DTC 14:

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 heater control panel Initial Inspection and Diagnostic Overview.

3. Check for DTCs.

Is DTC 14 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.

6. Test the evaporator temperature sensor Evaporator Temperature Sensor Test.

Is the evaporator temperature sensor OK?

YES -

With the evaporator temperature sensor disconnected, go to step 7.

NO -

Replace the evaporator temperature sensor Service and Repair.�

7. Disconnect the heater control panel 30P connector.

8. Check for continuity between heater control panel 30P connector terminal No. 28 and evaporator temperature sensor 2P connector terminal No. 2.





Is there continuity?

YES -

Go to step 9.

NO -

Repair an open in the wire between the heater control panel and the evaporator temperature sensor.�

9. Check for continuity between heater control panel 30P 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 heater control panel 30P connector and at the evaporator temperature sensor 2P connector. If the connections are good, substitute a known-good heater control panel, and recheck. If the symptom/indication goes away, replace the original heater control panel Service and Repair.�

NO -

Repair an open in the wire between the heater control panel and the evaporator temperature sensor.�