C1610

Code No.C1610: AWC Power Supply Electronic Relay Malfunction


























OPERATION

A relay is incorporated in AWC-ECU, and the power is supplied to the actuator via this relay.

DIAGNOSTIC TROUBLE CODE SET CONDITIONS

This diagnostic trouble code is set when the actuator power supply voltage is less than 6 V while the actuator power supply relay in the AWC-ECU is ON.

PROBABLE CAUSES

- Malfunction of AWC-ECU

- Malfunction of electronic control coupling solenoid (center)

- Malfunction of electronic control coupling solenoid (Front)

- Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

STEP 1. Electronic control coupling solenoid (front) connector, intermediate connector, AWC-ECU connector check: B-28, A-13, C-42, C-139

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the defective connector. Then go to Step 10.
STEP 2. Check the wiring harness between B-28 electronic control coupling solenoid (front) connector terminal No.1 and C-139 AWC-ECU connector terminal No.1.

Check the power supply line for short circuit.

Q. Is the check result normal?

YES Go to Step 3.
NO Repair the wiring harness. Then go to Step 10.
STEP 3. Check the wiring harness between B-28 electronic control coupling solenoid (front) connector terminal No.2 and C-139 AWC-ECU connector terminal No.14.

Check the ground line for short circuit.

Q. Is the check result normal?

YES Go to Step 4.
NO Repair the wiring harness. Then go to Step 10.
STEP 4. Check of the electronic control coupling solenoid (Front)

Refer to Electronic Control Coupling Solenoid (Front) Check [Vehicles with S-AWC].

Q. Is the check result normal?

YES Go to Step 5.
NO Replace the transfer assembly (Refer to Transfer Assembly Removal and Installation [Vehicles with S-AWC]). Then go to Step 10.
STEP 5. Electronic control coupling solenoid (center) connector, intermediate connector, AWC-ECU connector check: D-138, C-138, D-113, C-139

Q. Is the check result normal?

YES Go to Step 6.
NO Repair the defective connector. Then go to Step 10.
STEP 6. Check the wiring harness between D-138 electronic control coupling solenoid (center) connector terminal No.2 and C-139 AWC-ECU connector terminal No.2.

Check the power supply line for short circuit.

Q. Is the check result normal?

YES Go to Step 7.
NO Repair the wiring harness. Then go to Step 10.
STEP 7. Check the wiring harness between D-138 electronic control coupling solenoid (center) connector terminal No.1 and C-139 AWC-ECU connector terminal No.3.

Check the ground line for short circuit.

Q. Is the check result normal?

YES Go to Step 8.
NO Repair the wiring harness. Then go to Step 10.
STEP 8. Check of the electronic control coupling solenoid (center)

Electronic Control Coupling Inspection [Electronic Control 4WD].

Q. Is the check result normal?

YES Go to Step 9.
NO Replace the electronic control coupling (center) Service and Repair). Then go to Step 10.
STEP 9. Check whether the diagnostic trouble code is reset.

Q. Is diagnostic trouble code No.C1610 set?

YES Replace the AWC-ECU. (Refer to AWC-ECU Removal and Installation). Then go to Step 10.
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions).
STEP 10. Check whether the diagnostic trouble code is reset.

Q. Is diagnostic trouble code No.C1610 set?

YES Return to Step 1.
NO This diagnosis is complete.