Inspection Procedure

1. Check if the CAN communication system DTC is output (see DTC CHECK/CLEAR  ).

   Result: 

   CAN COMMUNICATION SYSTEM
   
   

   DTC is not output	A
   DTC is output	B

1. B: REPAIR CAN COMMUNICATION SYSTEM (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
2. A: Go to next step. 

1. Check if the multiplex communication system DTC is output (see DTC CHECK/CLEAR ).

   Result: 

   MULTIPLEX COMMUNICATION SYSTEM
   
   

   DTC is not output	A
   DTC is output	B

1. B: REPAIR MULTIPLEX COMMUNICATION SYSTEM (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
2. A: Go to next step. 

1. Check if the skid control ECU connector is connected.

   OK: 

   The connector should be securely connected. 

1. NG: CONNECT CONNECTOR TO ECU CORRECTLY 
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" on the hand-held tester.

   DATA LIST: ABS 

   DATA LIST - ABS (USING HAND-HELD TESTER)
   
   

   Item	Measurement Item / Range (Display)	Normal Condition
   IG VOLTAGE	ECU power supply voltage / TOO LOW / NORMAL / TOO HIGH	TOO HIGH: 14.0 or over
   IG VOLTAGE	ECU power supply voltage / TOO LOW / NORMAL / TOO HIGH	NORMAL: 9.5 V to 14.0 V
   IG VOLTAGE	ECU power supply voltage / TOO LOW / NORMAL / TOO HIGH	TOO LOW: Below 9.5 V

4. Read the voltage condition output from the skid control 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 on (IG).
3. Measure the voltage according to the value(s) in DATA LIST - ABS (NOT USING HAND-HELD TESTER)  .

   Standard: 

   DATA LIST - ABS (NOT USING HAND-HELD TESTER)
   
   

   Tester Connection	Condition	Specified Condition
   A40-18 (IG1) - Body ground	Ignition switch on (IG)	10 to 14 V

   Fig 1: Inspect Skid Control ECU Connector (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.
2. Measure the resistance according to the value(s) in SKID CONTROL ECU CONNECTOR (GND TERMINAL CONTINUITY)  .

   Standard: 

   SKID CONTROL ECU CONNECTOR (GND TERMINAL CONTINUITY)
   
   

   Tester Connection	Specified Condition
   A40-4 (GND1) - Body ground	Below 1 Ω
   A40-1 (GND2) - Body ground	Below 1 Ω

   Fig 2: Inspecting Skid Control ECU Connector (GND Terminal Continuity)

   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 combination meter assy (see HOW TO PROCEED WITH TROUBLESHOOTING ).

1. NG: REPLACE COMBINATION METER ASSY (SEE  OVERHAUL  ) 
2. OK: REPLACE BRAKE ACTUATOR ASSY (SEE  REPLACEMENT  ) 

HINT:

If troubleshooting has been carried out according to the problem symptoms table, refer back to the table and proceed to the next step before replacing the part (see PROBLEM SYMPTOMS TABLE  ).