Inspection Procedure

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 battery voltage.

   Standard voltage: 11 to 14 V 

NG: RECHARGE OR REPLACE BATTERY 

OK: Go to Next Step 

1. Check for DTC (see DTC CHECK / CLEAR  ).

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   Warning light remains on (when using intelligent tester)	A
   Warning light remains on (DTC cannot be output) (when not using intelligent tester)	B
   Malfunction code is output	C
   Normal code is output (when not using intelligent tester)	D

B: Go to step  5

C: REPAIR DTCS CIRCUITS INDICATED BY OUTPUT 

D: END 

A: Go to Next Step 

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

   Skid control ECU 

   DIAGNOSTIC NOTE CHART
   
   

   Item	Measurement Item / Range (Display)	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 1: 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 (see DTC CHECK / CLEAR ).

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to Next Step 

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

NG: REPAIR OR REPLACE COMBINATION METER ASSEMBLY 

OK: REPLACE SKID CONTROL ECU