Inspection Procedure

HINT:

• When using the intelligent tester, start form *1 if the VSC TRAC warning light does not light up, or start form *3 if the VSC TRAC warning light remains on.
• When not using the intelligent tester, start form *2 if the VSC TRAC warning light does not light up, or start form *4 if the VSC TRAC warning light remains on.

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (WARNING LIGHT)*1 
   1. Select the ACTIVE TEST, generate a control command, and then check that the VSC TRAC warning light operates.

      Skid control ECU 

      DATA LIST
      
      

      Item	Vehicle Condition / Test Details	Diagnostic Note
      VSC TRAC WARN LIGHT	Turn VSC TRAC warning light ON / OFF	Observe combination meter

      OK: VSC TRAC warning light turns on or off. 

   OK: REPLACE SKID CONTROL ECU ASSEMBLY 

   NG: Go to Next step 

2. CHECK VSC TRAC WARNING LIGHT*2 
   1. Disconnect the A40 ECU connector.
   2. Turn the ignition switch ON.
   3. Using a service wire, connect terminal WA to GND3 or GND4 of the A40 ECU connector. Check the VSC TRAC warning light.

      OK: VSC TRAC warning light turns off. 

   4. Turn the ignition switch OFF.
   5. Remove the service wire.
   6. Turn the ignition switch ON. Check the VSC TRAC warning light.

      OK: VSC TRAC warning light illuminates. 

   OK: REPLACE SKID CONTROL ECU ASSEMBLY 

   NG: Go to Next step 

3. INSPECT RELAY (Marking: IG1 NO. 2) 
   1. Remove the IG1 NO. 2 relay from the cowl side junction block LH.
   2. Measure the resistance of the relay.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      1 - 2	10 kΩ or higher
      1 - 2	Below 1 Ω (when battery voltage is applied to terminals 3 and 4)

   NG: REPLACE RELAY 

   Fig 1: Identifying IG1 NO. 2 Relay Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: CHECK COMBINATION METER (COMBINATION METER CIRCUIT) 

4. INSPECT SKID CONTROL ECU CONNECTOR*3 
   1. Check that each ECU connector is properly installed.

      OK: Each ECU connector is properly installed. 

   NG: CONNECT CONNECTOR TO ECU CORRECTLY 

   OK: Go to Next step 

5. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (VSC TRAC WARNING LIGHT) 
   1. Select the ACTIVE TEST, generate a control command, and then check that the VSC TRAC warning light operates.

      Skid control ECU 

      DATA LIST
      
      

      Item	Vehicle Condition / Test Details	Diagnostic Note
      VSC TRAC WARN LIGHT	Turn VSC TRAC warning light ON / OFF	Observe combination meter

      OK: VSC TRAC warning light turns on or off. 

   OK: REPLACE SKID CONTROL ECU ASSEMBLY 

   NG: Go to Next step 

6. CHECK FOR DTC*4 
   1. Turn the ignition switch ON.
   2. Check that the VSC TRAC warning light illuminates.
   3. Check if the same DTCs are recorded.

      Result: 

      RESULT
      
      

      Result	Proceed to
      DTC is not output	A
      DTC is output	B

   B: REPAIR CIRCUIT INDICATED BY OUTPUT DTC 

   A: Go to Next step 

7. CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - COMBINATION METER) 

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: REPLACE SKID CONTROL ECU ASSEMBLY