Code No.C1610: Electronic control coupling solenoid power supply relay malfunction

OPERATION

A relay is incorporated in 4WD-ECU, and the power is supplied to the actuator via this relay.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is stored when the abnormality below is detected:

Battery power supply voltage is less than 6 V.
Abnormal voltage in the 4WD-ECU.

PROBABLE CAUSES

Malfunction of 4WD-ECU
Malfunction of electronic control coupling solenoid
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the wiring harness between electronic control coupling solenoid connector and 4WD-ECU connector.

(1)Disconnect the 4WD-ECU connector and the electronic-controlled coupling solenoid connector.

(2)Measure the resistance between the wiring harness side connector terminals (SOL+ and SOL-) of the 4WD-ECU connector and body earth
OK: No continuity

Q. Is the check result normal?

	Go to Step 2

	Repair the defective connector or the wiring harness.

STEP 2. Check of the electronic control coupling solenoid

Refer to

Q. Is the check result normal?

	Go to Step 3

	Replace the electronic control coupling (Refer to ).

STEP 3. Check whether the diagnosis code is stored again.

Q. Is diagnosis code No.C1610 stored?

	Replace the 4WD-ECU (Refer to ). Then go to Step 4.

	Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

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

Q. Is diagnosis code No.C1610 stored?

	Return to Step 1.

	This diagnosis is complete.