Mitsubishi Motors Service Manual

2018 / ECLIPSE CROSS / EC - Workshop Manual

55 -HEATER, AIR CONDITIONER AND VENTILATION > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > B112A/B112B PA. A/M DAMPER CIRCUIT OPEN, SHORT

Code No.B112A: PA. A/M damper circuit open <Vehicles with dual-zone auto A/C>
Code No.B112B: PA. A/M damper circuit short <Vehicles with dual-zone auto A/C>

COMMENTS ON TROUBLE SYMPTOM

When the air conditioner outlet temperature on the passenger's seat side cannot be adjusted, open circuit (Code No. B112A) and short circuit (Code No. B112B) of the air mixing damper control motor circuit are set.

PROBABLE CAUSES

Malfunction of the air mix damper control motor (Passenger’s side)
Damaged wiring harness or connectors
Malfunction of the A/C controller assembly (A/C-ECU)

DIAGNOSIS PROCEDURE

STEP 1. Check the compressor operation

Check that the compressor operates under the following conditions.

Engine operation
Air volume control dial: Maximum
Air conditioner switch: ON
Temperature control dial: MAX COOL

Is the check result normal?

Go to Step 2.

Refer to inspection procedure 5 "The A/C compressor does not work"

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

Carry out the actuator test (Refer to

Item No.20: Passenger’s side air mixing damper

Is the check result normal?

Go to Step 4.

Go to Step 3.

STEP 3. Check of open circuit in IG1, PA, PA’, PB and PB’ line between air mixing damper control motor connector and A/C controller assembly (A/C-ECU) connector.

Is the check result normal?

Go to Step 4.

Repair the connector(s) or wiring harness.

STEP 4. Check whether the diagnosis code is set again.

Is the diagnosis code set?

Replace the air mix damper control motor (Passenger’s side). Then go to Step 5.

The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction

STEP 5. Check whether the diagnosis code is set again.

Is the diagnosis code set?

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

This procedure is complete.