Inspection Procedure

1. Is a DTC output for ABS?

   Result: 

   CHECK DTC
   
   

   DTC is not output	A
   DTC is output	B

1. B: REPAIR CIRCUIT INDICATED BY OUTPUT CODE (SEE  DIAGNOSTIC TROUBLE CODE CHART  ) 
2. A: GO TO NEXT STEP. 

1. Check the ECU connector's connecting condition.

   OK: The connector should be securely connected. 

1. NG: CONNECT CONNECTOR TO ECU 
2. OK: GO TO NEXT STEP. 

1. Check the battery voltage.

   Standard: 

   Voltage: 11 to 14 V 

1. NG: INSPECT CHARGING SYSTEM (SEE  ON-VEHICLE INSPECTION  ) 
2. OK: GO TO NEXT STEP. 

WHEN USING HAND-HELD TESTER: 

1. Connect the hand-held tester to the DLC3.
2. Start the engine.
3. Select DATA LIST mode on the hand-held tester.
   DATA LIST
   
   

   Item	Measurement Item / Range (Display)	Normal Condition
   IG VOLTAGE	ECU power supply voltage / TOO LOW / NORMAL / TOO HIGH	TOO LOW: Below 9.8 V
   IG VOLTAGE	ECU power supply voltage / TOO LOW / NORMAL / TOO HIGH	NORMAL: 9.8 to 14.0 V
   IG VOLTAGE	ECU power supply voltage / TOO LOW / NORMAL / TOO HIGH	TOO HIGH: 14.0 V or over

4. Read the voltage condition output from the ECU displayed on the hand-held tester.

   OK: "Normal" is displayed. 

WHEN NOT USING HAND-HELD TESTER: 

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 SKID CONTROL ECU CONNECTOR TERMINALS VOLTAGE  .

   Standard: 

   SKID CONTROL ECU CONNECTOR TERMINALS VOLTAGE
   
   

   Tester Connection	Condition	Specified Condition
   S1-46 (IG1) - Body ground	IG switch ON	10 to 14 V

   Fig 1: Inspecting Skid Control ECU Terminal Voltage (IG1 Terminal Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) 
2. OK: GO TO NEXT STEP. 

1. Disconnect the skid control ECU connector and combination meter connector.
2. Measure the resistance according to the value(s) in SKID CONTROL ECU AND COMBINATION METER TERMINALS RESISTANCE  .

   Standard: 

   SKID CONTROL ECU AND COMBINATION METER TERMINALS RESISTANCE
   
   

   Tester Connection	Specified Condition
   C9-37 - S1-17 (WA)	Below 1 Ω

3. Measure the resistance according to the value(s) in SKID CONTROL ECU TERMINAL AND BODY GROUND RESISTANCE  .

   Standard: 

   SKID CONTROL ECU TERMINAL AND BODY GROUND RESISTANCE
   
   

   Tester Connection	Specified Condition
   S1-17 (WA) - Body ground	10 kΩ or higher

   Fig 2: Checking Harness And Connector (Skid Control ECU - Combination Meter)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

1. Disconnect the skid control ECU connector.
2. Measure the resistance according to the value(s) in SKID CONTROL ECU TERMINAL AND BODY GROUND RESISTANCE  .

   Standard: 

   SKID CONTROL ECU TERMINAL AND BODY GROUND RESISTANCE
   
   

   Tester Connection	Specified Condition
   S1-32 (GND2) - Body ground	Below 1 Ω

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

1. Check combination meter assy (see COMBINATION METER ).

1. NG: CHECK COMBINATION METER ASSY (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
2. OK: REPLACE BRAKE ACTUATOR ASSY (SEE  REPLACEMENT  )