Inspection Procedure

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

CHECK DTC

Check if the ABS, VSC and/or Electronically Controlled Brake System DTC is output (see DTC CHECK / CLEAR ).

Result

RESULT CHART

Display (DTC Output)	Proceed To
DTC is not output	A
DTC is output	B (see DIAGNOSTIC TROUBLE CODE CHART )

B: REPAIR CIRCUIT INDICATED BY OUTPUT CODE

A: Go to next step

INSPECT CAN COMMUNICATION SYSTEM

Check if the CAN communication system DTC is output (see DIAGNOSIS SYSTEM ).

Result

RESULT CHART

Display (DTC Output)	Proceed To
DTC is not output	A
DTC is output	B

B: REPAIR CAN COMMUNICATION SYSTEM

A: Go to next step

INSPECT MULTIPLEX COMMUNICATION SYSTEM

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

Result

RESULT CHART

Display (DTC Output)	Proceed To
DTC is not output	A
DTC is output	B

B: REPAIR MULTIPLEX COMMUNICATION SYSTEM

A: Go to next step

INSPECT IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED
1. Check the skid control ECU connector's connection.
  OK:
  
  The connector is securely connected.
NG: CONNECT CONNECTOR TO ECU CORRECTLY

OK: Go to next step
INSPECT BATTERY
1. Check the battery voltage.
  Voltage:
  
  11 to 14 V
NG: INSPECT CHARGING SYSTEM

OK: Go to next step

INSPECT SKID CONTROL ECU (IG1 TERMINAL)

Disconnect the skid control ECU connector.
Turn the engine switch on (IG).

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

Voltage

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Condition	Specified Condition
A13-16 (IG1) - Body ground	Engine switch on (IG)	10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

Fig 1: Identifying Skid Control ECU (IG1 Terminal)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

INSPECT SKID CONTROL ECU (GND TERMINAL)

Disconnect the skid control ECU (A13, A15) connectors.

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

Resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Specified Condition
A13-1 (GND) - Body ground	Below 1 Ω
A15-1 (GND4) - Body ground	Below 1 Ω

Fig 2: Identifying Skid Control ECU (A13, A15) Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: Go to next step

READ VALUE OF INTELLIGENT TESTER (PARKING BRAKE SWITCH)

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).

Select the DATA LIST mode on the intelligent tester.

ABS / VSC:

NORMAL CONDITION CHART

Item (Display)	Measurement Item/Range (Display)	Normal Condition
PARKING BRAKE SW	Parking brake switch/ ON or OFF	ON: Brake pedal depressed OFF: Brake pedal replaced

Using the intelligent tester, check the input of switch operation when the parking brake switch is operated.
OK:

When the parking brake is operated, the display changes as shown above.

NG: Go to step 10

OK: Go to next step

INSPECT COMBINATION METER ASSEMBLY
1. Check the combination meter assembly (see INITIALIZATION ).
  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 ).
NG: REPLACE COMBINATION METER ASSEMBLY

OK: REPLACE SKID CONTROL ECU

INSPECT PARKING BRAKE SWITCH

Disconnect the parking brake switch connector.

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

Resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Condition	Specified Condition
1 - Body ground	Parking brake switch ON (Switch pin free)	Below 1 Ω
1 - Body ground	Parking brake switch OFF (Switch pin pushed in)	10 kΩ or higher

Fig 3: Inspecting Parking Brake Switch

NG: REPLACE PARKING BRAKE SWITCH

OK: Go to next step

CHECK HARNESS AND CONNECTOR (PARKING BRAKE SWITCH TO COWL SIDE J/B RH ECU)

Disconnect the cowl side J/B RH ECU connector and parking brake switch connector.

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

Resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Specified Condition
CUSTOMIZE PARAMETERS - A31-1	Below 1 Ω
CUSTOMIZE PARAMETERS - Body ground	10 kΩ or higher

Fig 4: Identifying Cowl Side J/B RH ECU And Parking Brake Switch Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO COWL SIDE J/B RH ECU)

Disconnect the skid control ECU connector and cowl side J/B RH ECU connector.

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

Resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Specified Condition
A15-20 (PKB) - K67-18 (PKBO)	Below 1 Ω
A15-20 (PKB) - Body ground	10 kΩ or higher

Fig 5: Identifying Skid Control ECU And Cowl Side J/B RH ECU Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE COWL SIDE J/B RH ECU