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Inspection Procedure 4: No DTC is set even when the AWD/LOCK Indicator Lights Flash.
 
 
 
 
COMMENTS ON TROUBLE SYMPTOM
  • In case that the AWD/LOCK indicator flashes but no DTC is set, the AWD-ECU power supply circuit system or AWD-ECU may have a problem.
  • If the AWD-ECU power supply voltage is approximately 6.5 V or less when the system is in operation (always), the CPU of AWD-ECU automatically shuts down. At this time, if the AWD control is in operation, it switches to the FWD control. AWD-ECU cannot set the DTC because the CPU shuts down. In addition, the combination meter determines the AWD-ECU time-out, and flashes both AWD and LOCK indicators.
 
 
PROBABLE CAUSES
  • Damaged wiring harness and connectors
  • AWD-ECU malfunction
 
 
 
DIAGNOSIS
STEP 1. Check if 4WD/LOCK Indicator Lights flash simultaneously
(1) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(2) Check that the 4WD/LOCK indicator lights flash simultaneously when the drive mode selector is switched to 4WD (AWD) position, or LOCK position.
Does the 4WD/LOCK Indicator Lights flash simultaneously?
  • 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: Scan tool MB991958 cannot Communicate with the Electronic Control AWD System<ECU power supply circuit system check> ", perform the check .
Referring to the Inspection Chart for Trouble Symptoms, perform the check .