DTC 2

DTC 2: A Problem in the Air Mix Control Motor Circuit

1. Disconnect the air mix control motor 7P connector.
2. Disconnect the heater control panel 30P connector.




3. Check for continuity between body ground and the heater control panel 30P connector terminals No. 10, 11, 21, 25 and 27 individually.

Is there continuity?

YES - Repair any short to body ground in the wire(s) between the heater control panel and the air mix control motor.

NO - Go to step 4.




4. Turn the ignition switch ON (II), and check the same terminals for voltage.

Is there any voltage?

YES - Repair any short to power in the wire(s) between the heater control panel and the air mix control motor. This short may also damage the heater control panel. Repair the short to power before replacing the heater control panel.

NO - Go to step 5.

5. Turn the ignition switch OFF.




6. Check for continuity between following terminals of the heater control panel 30P connector and the air mix control motor 7P connector.
30P: 7P
No. 10 No. 1
No. 11 No. 2
No. 21 No. 3
No. 25 No. 7
No. 27 No. 5

Is there continuity?

YES - Go to step 7.

NO - Repair any open in the wire(s) between the heater control panel and the air mix control motor.

7. Test the air mix control motor.

Is the air mix control motor OK?

YES - Check for loose wires or poor connections at the heater control panel connector (30P) and at air mix control motor 7P connector. If the connections are good, substitute a known-good air mix control motor and recheck. If the symptom/indication goes away, replace the original air mix control motor. If the symptom/indication continues, substitute a known good heater control panel, and recheck. If the symptom/indication goes away, replace the original heater control panel.

NO - Replace the air mix control motor.