INSPECTION PROCEDURE 6: Outside/Inside Air Changeover Is Not Possible: Diagnosis

WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools:

MB991223: Harness Set
MB992006: Extra Fine Probe
MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, check for diagnostic trouble code.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Check if an A/C-ECU DTC is set.
1. Connect scan tool MB991958. Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ."
2. Turn the ignition switch to the "ON" position.
3. Check if the DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.
  Q: Is the DTC set?
  1. YES: Refer to DIAGNOSTIC TROUBLE CODE CHART .
  2. NO: Go to Step 2.
    
    Fig 1: Connecting Scan Tool To Data Link Connector
    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Check outside/inside air selection damper control motor connector C-111 and A/C-ECU connector C-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are outside/inside air selection damper control motor connector C-111 and A/C-ECU connector C-20 in good condition?
1. YES: Go to Step 3.
2. NO: Repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION . Check that the A/C works normally.
STEP 3. Check the wiring harness between A/C-ECU connector C-20 (terminal 26, 25, 27, 24 and 29) and outside/inside air selection damper control motor connector C-111 (terminals 2, 5, 4. 1 and 3).
- Check the A/C-ECU signal line for open and short circuit.
  Q: Are the wiring harness between A/C-ECU connector C-20 (terminal 26, 25, 27, 24 and 29) and outside/inside air selection damper control motor connector C-111 (terminals 2, 5, 4. 1 and 3) in good condition?
  1. YES: Go to Step 4.
  2. NO: Repair the wiring harness. Check that the A/C works normally.
STEP 4. Replace the outside/inside air selection damper control motor and check the trouble symptom again
Check the trouble symptom again.

Q: Is the check result satisfactory?
1. YES: The procedure is complete.
2. NO: Replace the A/C-ECU.