INSPECTION PROCEDURE 5: The Inside/outside air changeover is impossible.

COMMENTS ON TROUBLE SYMPTOM

If the air recirculation cannot be changed by using the inside air/outside air changeover switch, the inside air/outside air changeover motor system may be faulty.

PROBABLE CAUSES

Malfunction of the outside/inside air selection damper control motor
Damaged wiring harness or connectors
Malfunction of the auto A/C controller assembly (A/C-ECU).

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Check that the diagnosis code related to the air conditioner is not set.

Q. Is the diagnosis code set?

	Carry out the diagnosis code procedures. Refer to .

	Go to Step 2.

STEP 2. M.U.T.-III actuator test

Carry out the actuator test (Refer to

Item No.5: In/out selection damper/

Q. Does the blower motor work normally?

	This diagnosis is complete.

	Go to Step 3.

STEP 3. Check open and short circuit in FRE and REC line between IG2 relay, outside/inside air selection damper control motor and auto A/C controller assembly (A/C-ECU).

note

Before the wiring harness check, check the junction block connector.

Q. Is the check result normal?

	Go to Step 4.

	Repair the connector(s) or wiring harness.

STEP 4. Check the data list below on the M.U.T.-III.

All the following items in the data list should be normal.

Item No.45: In/out select damper poten (target)
Item No.46: In/out select damper potentiometer

Q. Is the check result normal?

	Go to Step 5.

	Replace the auto A/C controller assembly (A/C-ECU).

STEP 5. Replace the air outside/inside air circulation switching damper motor, and then recheck the trouble symptom.

Check to see that the outside air/inside air circulation switching damper motor operates normally.

Q. Is the check result normal?

	This diagnosis is complete.

	Replace the auto A/C controller assembly (A/C-ECU)