Inspection Procedure 4: No Diagnosis Code is set even when the 4WD-E/LOCK Indicator Lamps flash.

In case that the 4WD-E/LOCK indicator flashes but no diagnosis code is set, the 4WD-ECU power supply circuit system may have a problem.
If the 4WD-ECU power supply voltage is approximately 6 V or less when the system is in operation (always), the CPU of 4WD-ECU automatically shuts down. At this time, if the 4WD control is in operation, the system will switch the drive mode into 2WD gradually to protect the drive train. 4WD-ECU cannot set the diagnosis code because the CPU shuts down. In addition, the combination meter determines the 4WD-ECU time-out, and flashes both 4WD-E/LOCK indicators.

DIAGNOSIS PROCEDURE

(1)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.

(2)Check that the 4WD-E/LOCK indicator lamps flash simultaneously when the drive mode selector is switched to 4WD ECO, or 4WD LOCK position.

When the drive system fluid temperature warning display illuminates in the combination meter, cool down the electronic control coupling.
When the drive system fluid temperature warning display does not illuminate in the combination meter, referring to "Inspection Procedure 1: M.U.T.-III cannot Communicate with the Electronically Controller 4WD System<ECU power supply circuit system check> ", perform the check .

	Referring to the Inspection Chart for Trouble Symptoms, perform the check .