Diagnostic Procedure

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.

STEP 1. Scan tool CAN bus diagnostics
Using the scan tool, diagnose the CAN bus lines.

Q: Is the check result normal?
- YES: Go to Step 3.
- NO: Repair the CAN bus line (Refer to TROUBLESHOOTING ). After repairing the CAN bus line, go to Step 2.
STEP 2. DTC recheck after repairing the CAN bus line
1. Erase the DTC.
2. Turn the ignition switch from the LOCK (OFF) position to the ON position, and then wait for 4 seconds.
3. Using the scan tool, apply the specified current to the AYC proportioning valve, and forcibly activate the AYC direction valve (RH). (Refer to ACTUATOR TEST TABLE ).
4. Check if the DTC is set.
  Q: Is DTC No. C161A set?
  - YES: Go to Step 3.
  - NO: This diagnosis is complete.
STEP 3. Connector check:
Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case.
- C-46 AWC-ECU connector
- F-12 AYC direction valve (RH) connector
- D-11 intermediate connector, F-11 intermediate connector
- No. 9 body ground
  Q: Are the connectors and terminals in good condition?
  - YES: Go to Step 4.
  - NO: Repair the faulty connector(s) or terminal(s). Then go to Step 8.
STEP 4. Harness check
1. Check the wiring harness among C-46 AWC-ECU connector (terminal No. 3), D-11 intermediate connector (terminal No. 24), F-11 intermediate connector (terminal No. 2), and F-12 AYC direction valve (RH) connector (terminal No. 2) for any problems.
2. Check the wiring harness among F-12 AYC direction valve (RH) connector (terminal No. 1), F-11 intermediate connector (terminal No. 3), and No. 9 body ground for any problems.
  Q: Is the harness in good condition?
  - YES: Go to Step 5.
  - NO: Repair the problem in the wiring harness. Then go to Step 8.
STEP 5. Resistance measurement between AYC direction valve solenoid (RH) connector (equipment side) terminals

Fig 1: Measuring Resistance Between F-12 Connector Terminals
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Disconnect the F-12 AYC direction valve (RH) connector and measure the resistance between connector terminals on the equipment side.

Standard value: 15.9 ± 0.5 Ω

Q: Is the measured resistance value within the standard value range?
- YES: Go to Step 6.
- NO: Replace the hydraulic unit. (Refer to HYDRAULIC UNIT ). Then go to Step 8.
STEP 6. Scan tool service data
Check the following service data. (Refer to DATA LIST REFERENCE TABLE ).
- Item 95: AYC direction valve (RH) activation command
  Q: Is the check result normal?
  - YES: Go to Step 7.
  - NO: Replace the AWC-ECU (Refer to AWC-ECU ). Then go to Step 8.
STEP 7. Check whether the DTC is reset.
1. Erase the DTC.
2. Turn the ignition switch from the LOCK (OFF) position to the ON position, and then wait for 4 seconds.
3. Using the scan tool, apply the specified current to the AYC proportioning valve, and forcibly activate the AYC direction valve (RH). (Refer to ACTUATOR TEST TABLE ).
4. Check if the DTC is set.
  Q: Is DTC No. C161A set?
  - YES: Replace the AWC-ECU (Refer to AWC-ECU ). Then go to Step 8.
  - NO: An intermittent malfunction is suspected. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
STEP 8. Check whether the DTC is reset.
1. Erase the DTC.
2. Turn the ignition switch from the LOCK (OFF) position to the ON position, and then wait for 4 seconds.
3. Using the scan tool, apply the specified current to the AYC proportioning valve, and forcibly activate the AYC direction valve (RH). (Refer to ACTUATOR TEST TABLE ).
4. Check if the DTC is set.
  Q: Is DTC No. C161A set?
  - YES: Diagnose again from Step 1.
  - NO: This diagnosis is complete.