Inspection Procedure

CHECK VOLTAGE (EXI4 OF SKID CONTROL ECU AND BODY GROUND)
1. Remove the skid control ECU with the connectors still connected.
2. Turn the ignition switch ON.
3. Measure voltage between terminal EXI4 (V18 - 17) of the skid control ECU and body ground with the transfer shift lever in L4 position and in other than L4 position.
  OK:
  
  Voltage:
  
  L4 position: Below 2.0 V
  
  Except L4 position: 10 - 14 V
  
  Fig 1: Checking Voltage (EXI4 Of Skid Control ECU & Body Ground)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG : GO TO NEXT STEP
CHECK TRANSFER L4 POSITION SWITCH
NG : REPAIR TRANSFER L4 POSITION SWITCH

OK : GO TO NEXT STEP
CHECK HARNESS AND CONNECTOR (TRANSFER L4 POSITION SWITCH - SKID CONTROL ECU)
1. Check for open and short circuit in harness and connector between transfer L4 position switch and skid control ECU (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : CHECK AND REPLACE SKID CONTROL ECU ASSY