Inspection Procedure

CHECK THAT CENTER DIFFERENTIAL IS FREE AND CENTER DIFF. LOCK SWITCH IS OFF
1. NG: REPAIR CENTER DIFF. LOCK SYSTEM
2. OK: GO TO NEXT STEP.
CHECK RECONFIRM DTC
1. NO: NO PROBLEM
2. YES: GO TO NEXT STEP.
CHECK THAT BULB FOR CENTER DIFF. LOCK INDICATOR LIGHT IS NOT BURNT OUT
1. YES: CHECK AND REPLACE COMBINATION METER ASSY
2. NO: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR(CENTER DIFF. LOCK SWITCH - SKID CONTROL ECU (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
1. Check for open and short circuit in harness and connector between center diff. lock switch and skid control ECU (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
1. NO: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR(SKID CONTROL ECU - COMBINATION METER)
1. Check for open and short circuit in harness and connector between skid control ECU and combination meter (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
1. NO: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: GO TO NEXT STEP.
INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (EXI TERMINAL)

Fig 1: Inspecting Skid Control ECU Terminal Voltage (EXI Terminal)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Remove the skid control ECU with connector still connected.
2. Turn the ignition switch ON.
3. Measure the voltage between terminal EXI of skid control ECU and body ground.
OK:

When center diff. lock: Below 2 V

When center diff. free: 8 - 14 V
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: GO TO NEXT STEP.
INSPECT CENTER DIFF. LOCK DETECTION SWITCH
1. NG: REPAIR OR REPLACE CENTER DIFF. LOCK DETECTION SWITCH
2. OK: GO TO NEXT STEP.
CHECK AND REPLACE SKID CONTROL ECU ASSY