Inspection Procedure

NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (see INITIALIZATION ).

PERFORM ACTIVE TEST USING TECHSTREAM (SKID CONTROL BUZZER)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG) and turn the Techstream main switch on.

Select Active Test mode on the Techstream.

ABS/VSC/TRAC

TESTER DISPLAY REFERENCE CHART

Tester Display	Vehicle Condition/Test Details	Control Range	Diagnostic Note
Buzzer	Turns skid control buzzer	ON/OFF	Buzzer can be heard

Check that the buzzer sounds/stops when turning the skid control buzzer on/off by using the Techstream.

Result

RESULT CHART

Result	Proceed to
Buzzer does not sound or sounds constantly	A
Buzzer sounds/stops	B

HINT:

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

B: REPLACE SKID CONTROL ECU (See REMOVAL )

A: Go to Next Step

INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL)

Disconnect the L2 buzzer connector.
Turn the engine switch on (IG).

Measure the voltage according to the value(s) in the table below.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Switch Condition	Specified Condition
L2-2 - Body ground	Engine switch on (IG)	11 to 14 V

Fig 1: Identifying L2 Buzzer Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

OK: Go to Next Step

INSPECT SKID CONTROL BUZZER
1. Disconnect the skid control buzzer connector.
2. Apply battery negative voltage to terminal 1, and battery positive voltage to terminal 2 of the skid control buzzer, and then check that the buzzer sounds.
  
  Fig 2: Inspecting Skid Control Buzzer
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: Skid control buzzer sounds.
  
  NG: REPLACE SKID CONTROL BUZZER (See REMOVAL )
  
  OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SKID CONTROL BUZZER)

Disconnect the A19 ECU connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Condition	Specified Condition
A19-22 (BZ) - L2-1	Always	Below 1 Ω
A19-22 (BZ) - Body ground	Always	10 kΩ or higher
A19-41 (VBZ) - L2-2	Always	Below 1 Ω
A19-41 (VBZ) - Body ground	Always	10 kΩ or higher

Fig 3: Identifying A19 And L2 Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BODY GROUND)

Disconnect the A19 and A21 ECU connectors.

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Condition	Specified Condition
A19-1 (GND) - Body ground	Always	Below 1 Ω
A21-1 (GND4) - Body ground	Always	Below 1 Ω

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 ).

Fig 4: Identifying A19 And A21 ECU Connector Terminals (GND)

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

OK: REPLACE SKID CONTROL ECU (See REMOVAL )