DTC C1311/11 Open in Main Relay 1 Circuit; DTC C1312/12 Short in Main Relay 1 Circuit; DTC C1313/13 Open in Main Relay 2 Circuit; DTC C1314/14 Short in Main Relay 2 Circuit: Wiring Diagram

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

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

Connect the intelligent tester to the DLC3.
Turn the ignition switch on.
Select the ACTIVE TEST mode on the intelligent tester.

Check the operation sound of the ABS No.1 and No.2 relays.

VEHICLE CONDITION / TEST DETAILS REFERENCE

Item	Vehicle Condition / Test Details	Diagnostic Note
ECB RELAY 1	Turns ABS No.1 relay ON/OFF	Operating of solenoid (clicking sound) can be heard
ECB RELAY 2	Turns ABS No.2 relay ON/OFF	Operating of solenoid (clicking sound) can be heard

OK: Operating sound of ABS No.1 and ABS No.2 relays should be heard.

NG : Go to step 6

OK : GO TO NEXT STEP

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

Remove the ABS No.1 relay and ABS No.2 relay.

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

Resistance

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
Terminal 1 - Terminal 2	100 Ω
Terminal 3 - Terminal 5	10 kΩ or higher (No Continuity)

Apply battery voltage between terminals 1 and 2.

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

Resistance

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
Terminal 3 - Terminal 5	Below 1 Ω

Fig 1: Removing ABS No.1 Relay And ABS No.2 Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE ABS NO.1 RELAY OR ABS NO.1 RELAY

OK : GO TO NEXT STEP

INSPECT FUSE (ABS NO.1, ABS NO.2 AND ABS NO.3 FUSES)

Remove the ABS No.1, ABS No.2 and ABS No.3 fuses.

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

Resistance

FUSE SPECIFIED CONDITION REFERENCE

Fuse	Specified Condition
ABS No.1 Fuse	Below 1 Ω (Continuity)
ABS No.2 Fuse	Below 1 Ω (Continuity)
ABS No.3 Fuse	Below 1 Ω (Continuity)

Fig 2: Removing ABS No.1, ABS No.2 And ABS No.3 Fuses

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE FUSE

OK : GO TO NEXT STEP

INSPECT SKID CONTROL ECU (+BI1, +BI2 TERMINAL)

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

HINT:

Measure the voltage from the back side of the connector with the connector connected to the skid control ECU.

Voltage

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
S39-3 (+BI1) - Body ground	10 to 14 V
S40-5 (+BI2) - Body ground	10 to 14 V

Fig 3: Inspecting Skid Control ECU (+Bi1, +Bi2 Terminal)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : GO TO NEXT STEP

INSPECT SKID CONTROL ECU (+BO1, +BO2, R1+, R2+ TERMINAL)

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

HINT:

Measure the voltage from the back side of the connector with the connector connected to the skid control ECU.

Voltage

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
S38-2 (R1+) - Body ground	10 to 14 V
S39-5 (+BO1) - Body ground	10 to 14 V
S40-4 (+BO2) - Body ground	10 to 14 V
S41-17 (R2+) - Body ground	10 to 14 V

Fig 4: Inspecting Skid Control ECU (+BO1, +BO2, R1+, R2+ Terminal)

NG : REPLACE SKID CONTROL ECU

OK : GO TO NEXT STEP

INSPECT SKID CONTROL ECU (BS1, BS2 TERMINAL)

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

HINT:

Measure the voltage from the back side of the connector with the connector connected to the skid control ECU.

Voltage

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
S38-3 (BS1) - Body ground	10 to 14 V
S41-7 (BS2) - Body ground	10 to 14 V

Fig 5: Inspecting Skid Control ECU (BS1, BS2 Terminal)

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : REPLACE SKID CONTROL ECU