Inspection Procedure

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

PERFORM ACTIVE TEST BY TECHSTREAM (ABS NO. 1 RELAY, ABS NO. 2 RELAY)

Select the ACTIVE TEST for the proper functioning of the ABS NO. 1 and ABS NO. 2 relays.

ABS / VSC / TRAC:

SKID CONTROL ECU DIAGNOSTIC CHART

Item	Test Details	Diagnostic Note
EBC* MAIN RELAY 2	Turns MAIN RELAY 1 ON / OFF	Operation of solenoid (clicking sound) can be heard
EBC* MAIN RELAY 1	Turns MAIN RELAY 2 ON / OFF	Operation of solenoid (clicking sound) can be heard
*: Electronically Controlled Brake.

OK: Operation sound of ABS NO. 1 relay and ABS NO. 2 relay should be heard.

NG: Go to step 3

OK: Go to Next Step

CHECK SKID CONTROL ECU (BS1, BS2 VOLTAGE)

Measure the voltage of the connectors.

HINT:

Measure the voltage from behind the connector with the connector connected to the skid control ECU.

Standard voltage

STANDARD VOLTAGE CHART

Tester Connection	Specified Condition
S7-3 (BS1) - Body ground	10 to 14 V
S10-7 (BS2) - Body ground	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 1: Checking Skid Control ECU (Bs1, Bs2 Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE SKID CONTROL ECU

INSPECT FUSE (ABS MAIN1, ABS MAIN2)
1. Remove the ABS MAIN1 and ABS MAIN2 fuses from the engine room relay block.
2. Measure the resistance of the fuses.
  Standard resistance: Below 1 Ω
NG: REPLACE FUSE

Fig 2: Identifying Skid Control ECU Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

INSPECT ABS MAIN RELAY (Marking: ABS NO. 1, ABS NO. 2)

Remove the ABS NO. 1 and ABS NO. 2 relays from the engine room relay block.

Measure the resistance of the relays.

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
3 - 5	10 kΩ or higher
3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2

NG: REPLACE RELAY

Fig 3: Inspecting Circuit Opening Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

CHECK SKID CONTROL ECU (+BI1, +BI2 VOLTAGE)

Measure the voltage of the connectors.

HINT:

Measure the voltage from behind the connector with the connector connected to the skid control ECU.

Standard voltage

STANDARD VOLTAGE CHART

Tester Connection	Specified Condition
S8-3 (+BI1) - Body ground	10 to 14 V
S9-5 (+BI2) - Body ground	10 to 14 V

Fig 4: Checking Skid Control ECU (+Bi1, +Bi2 Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to Next Step

CHECK SKID CONTROL ECU (+BO1, +BO2, R1+, R2+VOLTAGE)

Measure the voltage of the connectors.

HINT:

Measure the voltage from behind the connector with the connector connected to the skid control ECU.

Standard voltage

STANDARD VOLTAGE CHART

Tester Connection	Specified Condition
S7-2 (R1+) - Body ground	10 to 14 V
S8-5 (+BO1) - Body ground	10 to 14 V
S9-4 (+BO2) - Body ground	10 to 14V
S10-17 (R2+) - Body ground	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 5: Identifying Skid Control Connector Terminals

OK: Go to Next Step

CHECK SKID CONTROL ECU (BS1, BS2 VOLTAGE)

Measure the voltage of the connectors.

HINT:

Measure the voltage from behind the connector with the connector connected to the skid control ECU.

Standard voltage

STANDARD VOLTAGE CHART

Tester Connection	Specified Condition
S7-3 (BS1) - Body ground	10 to 14 V
S10-7 (BS2) - Body ground	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 6: Checking Skid Control ECU (BS1, BS2 Voltage)

OK: REPLACE SKID CONTROL ECU