Inspection Procedure

1. Turn the ignition switch ON.
2. Check that the VSC OFF indicator light turns on.
3. Check for DTC (see DTC CHECK / CLEAR  ).

   Result 

   RESULT CHART
   
   

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

B: REPAIR CIRCUITS INDICATED BY OUTPUT 

A: Go to Next Step 

1. Using the intelligent tester's ACTIVE TEST, generate a control command and then check that the VSC OFF indicator light operates.

   Skid control ECU 

   DIAGNOSTIC NOTE CHART
   
   

   Item	Vehicle Condition / Test Details	Diagnostic Note
   VSC/TRC OFF IND	Turns VSC OFF indicator ON/OFF	Observe combination meter

   OK: VSC OFF indicator light is turned on or off in accordance with intelligent tester. 

OK: REPLACE SKID CONTROL ECU 

NG: Go to Next Step 

Fig 1: Inspecting VSC OFF Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the VSC OFF switch.
2. Measure the resistance of the switch.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   1 - 2	Pushed	Below 1 Ω
   1 - 2	Released	10 kΩ or higher

NG: REPLACE VSC OFF SWITCH 

OK: Go to Next Step 

Fig 2: Checking Wire Harness (VSC OFF Switch - Skid Control ECU And Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the V7 switch connector.
2. Disconnect the S6 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   S6-12 (CSW) - V7-2	Below 1 Ω
   S6-12 (CSW) - Body ground	10 kΩ or higher
   V7-1 - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to Next Step 

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 

1. Check the DATA LIST for proper functioning of the IG voltage.

   Skid control ECU 

   DIAGNOSTIC NOTE CHART
   
   

   Tester Display	Measurement Item/ Range	Normal Condition	Diagnostic Note
   IG VOLTAGE	ECU power supply voltage /LOW/ NORMAL/HIGH	LOW: Below 10 V NORMAL: 10 to 14 V HIGH: 14 V or more	-

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   Display is not NORMAL	A
   Display is NORMAL	B

B: REPLACE SKID CONTROL ECU 

A: Go to Next Step 

Fig 3: Checking Wire Harness (Skid Control ECU - Battery And Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the S5, S7 and S8 ECU connectors.
2. Turn the ignition switch ON.
3. Measure the voltage of the wire harness side connectors.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   S7-6 (IG1) - S5-16 (GND4)	10 to 14 V
   S7-6 (IG1) - S5-22 (GND3)	10 to 14 V
   S7-6 (IG1) - S8-6 (GND2)	10 to 14 V
   S7-6 (IG1) - S8-31 (GND1)	10 to 14 V
   S7-6 (IG1) - Body ground	10 to 14 V

4. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   S5-16 (GND4) - Body ground	Below 1 Ω
   S5-22 (GND3) - Body ground	Below 1 Ω
   S8-6 (GND2) - Body ground	Below 1 Ω
   S8-31 (GND1) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to Next Step 

1. Check for open and short circuits in the multiplex communication system between the skid control ECU and combination meter.

NG: REPAIR OR REPLACE MULTIPLEX COMMUNICATION SYSTEM 

OK: Go to Next Step 

1. Check the combination meter (see PROBLEM SYMPTOMS TABLE ).

NG: REPAIR OR REPLACE COMBINATION METER 

OK: REPLACE SKID CONTROL ECU