Inspection Procedure

1. Disconnect the skid control ECU connector.
2. Turn the ignition switch to the ON position.
3. Measure the voltage according to the value(s) in the table below.

   Standard: 

   TESTER CONNECTION, CONDITION AND SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   S28-21 (EXI4) -Body ground	4WD control (L4) switch ON (Transfer L4 position)	Below 1.5 V
   S28-21 (EXI4) -Body ground	4WD control (L4) Switch OFF (Any transfer position except L4)	8 to 14 V

   Fig 1: Identifying Skid Control ECU EXI4 Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: Go to step   4 
2. OK: GO TO NEXT STEP 

1. Check if test mode (signal check) DTC is detected.

   Standard: 

   RESULT DESCRIPTION (1 OF 2)
   
   

   Test mode (signal check) DTC is output	A
   Test mode (signal check) DTC is not output (When troubleshooting in accordance with the DTC CHART.)	B
   Test mode (signal check) DTC is not output (When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE.)	C

1. B: REPAIR OR REPLACE HARNESS OR CONNECTOR (L4 CIRCUIT) 
2. C: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  
3. A: GO TO NEXT STEP 

1. Clear the DTC (see DTC CHECK/CLEAR  ).
2. Check if the same DTC is detected (see DTC CHECK/CLEAR  ).

   HINT:

   Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

   Result: 

   RESULT DESCRIPTION (2 OF 2)
   
   

   DTC is output	A
   DTC is not output	B

1. B: END 
2. A: REPLACE MASTER CYLINDER SOLENOID (SEE  OVERHAUL  ) 

1. Disconnect the 4WD control (4WD) switch connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard: 

   TESTER CONNECTION AND SPECIFIED CONDITION (1 OF 4)
   
   

   Tester Connection	Specified Condition
   F11-4 (GND) - Body ground	Below 1 Ω

   Fig 2: Identifying Four Wheel Drive Control Switch GND Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) 
2. OK: GO TO NEXT STEP 

1. Check the select high-low system (see INSPECTION ) or the select 2-4 and high-low system (see INSPECTION ).

1. NG: REPLACE FOUR WHEEL DRIVE CONTROL SWITCH 
2. OK: GO TO NEXT STEP 

1. Check the select high-low system (see INSPECTION ) or the select 2-4 and high-low system (INSPECTION ).

1. NG: REPLACE FOUR WHEEL DRIVE CONTROL ECU 
2. OK: GO TO NEXT STEP 

1. Disconnect the 4WD control ECU connector and 4WD control (L4) switch connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard: 

   TESTER CONNECTION AND SPECIFIED CONDITION (2 OF 4)
   
   

   Tester Connection	Specified Condition
   F9-15 (LO) - F11 -2 (LO)	Below 1 Ω
   F9-15 (LO) - Body ground	10 kΩ or higher

   Fig 3: Identifying Connectors (Four Wheel Drive Control ECU And Four Wheel Drive Control Switch)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. OK: GO TO NEXT STEP 

1. Measure the resistance according to the value(s) in the table below.

   Standard: 

   TESTER CONNECTION AND SPECIFIED CONDITION (3 OF 4)
   
   

   Tester Connection	Specified Condition
   S28-21 (EXI4) - F9-24 (L4)	Below 1 Ω
   S28-21 (EXI4) - Body ground	10 kΩ or higher

   Fig 4: Identifying Connectors (Skid Control ECU And Four Wheel Drive Control ECU)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. OK: GO TO NEXT STEP 

1. Disconnect the ECM connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard: 

   TESTER CONNECTION AND SPECIFIED CONDITION (4 OF 4)
   
   

   Tester Connection	Specified Condition
   S28-21 (EXI4) - E6-13 (L4)	Below 1 Ω
   S28-21 (EXI4) - Body ground	10 kΩ or higher

   Fig 5: Identifying Connectors (Skid Control ECU And ECM)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Results: