B1228

DTC Troubleshooting: B1228 (TAM sensor short)

DTC B1228 or TAM sensor short is indicated:

A Short in the Outside Air Temperature Sensor Circuit

1. Clear the DTC with the HDS.

2. Turn the ignition switch to LOCK (0), and then back to ON (II).

3. Do the self-diagnostic with the HDS or the climate control unit.

4. Check for DTCs.

Is DTC B1228 or TAM sensor short indicated?

YES -

Go to step 5.

NO -

Intermittent failure. Check for loose wires or poor connections on the outside air temperature sensor circuit.

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

6. Remove the outside air temperature sensor Service and Repair and test it Testing and Inspection.

Is the outside air temperature sensor OK?

YES -

With the outside air temperature sensor disconnected, go to step 7.

NO -

Replace the outside air temperature sensor Service and Repair.

7. Disconnect the climate control unit 40P connector.

8. Check for continuity between body ground and climate control unit 40P connector terminal No. 16.





Is there continuity?

YES -

Repair a short to body ground in the wire between the climate control unit and the outside air temperature sensor.

NO -

Go to step 9.

9. Check for continuity between climate control unit 40P connector terminals No. 16 and No. 33.





Is there continuity?

YES -

Repair a short in the wires between the climate control unit and the outside air temperature sensor.

NO -

Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit Climate Control Unit Removal/Installation.