Toyota Venza: Open or Short Circuit in ABS Motor Relay Circuit (C0273/13)

Toyota Venza Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Open or Short Circuit in ABS Motor Relay Circuit (C0273/13)

DESCRIPTION

The ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU turns the motor relay on and operates the ABS pump motor.

If the voltage supplied to the motor relay (+BM) is below the DTCs detection threshold due to low voltage from the battery or alternator, the DTC may be stored.

DTC Code	DTC Detection Condition	Trouble Area
C0273/13	Any of the following is detected: When the motor relay is actuated, voltage is not supplied to the pump motor. When the motor relay is not actuated, voltage in the pump motor is high.	Fusible link block (ABS NO. 1 fuse) ABS motor relay circuit Brake actuator assembly (ABS motor relay)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

When C1241/41 is output together with C0273/13, inspect and repair the trouble areas indicated by C1241/41 first (See page ).

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM (ABS MOTOR RELAY)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

ABS/VSC/TRAC

Tester Display	Test Part	Control Range	Diagnostic Note
Motor Relay	ABS motor relay	Relay ON/OFF	Operating sound of motor can be heard

(d) Check the operating sound of the ABS motor relay when operating it using the Techstream.

Result	Proceed to
The operating sound is heard	A
The operating sound is not heard	B

GO TO STEP 3

2.	RECONFIRM DTC

HINT:

This code is detected when a problem is identified in the brake actuator assembly.

The ABS motor relay is in the brake actuator assembly.

Therefore, ABS motor relay inspection and motor relay unit inspection cannot be performed. Be sure to check if the DTC is output before replacing the brake actuator assembly.

(a) Turn the ignition switch off.

(b) Clear the DTCs (See page ).

(d) Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.

Check if the same DTC is recorded (See page
).

Result	Proceed to
DTC (C0273/13) is not output	A
DTC (C0273/13) is output	B

HINT:

If a speed signal of 15 km/h (9 mph) or more is input to the skid control ECU, with the ignition switch ON and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.
If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harness, and fuses of the brake actuator assembly. Make sure that no DTCs are output.
If any DTCs are output while jiggling a connector or wire harness of the brake actuator assembly (skid control ECU), inspect and repair the connector or wire harness.
It is suspected that the DTCs were output due to a bad connection of the connector terminal.

CHECK FOR INTERMITTENT PROBLEMS

REPLACE BRAKE ACTUATOR ASSEMBLY

3.	INSPECT ABS NO. 1 FUSE

(a) Turn the ignition switch off.

(b) Remove the fusible link block from the engine room relay block.

OK:

The fusible link is not melted.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
ABS NO. 1 (50 A) fuse - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Engine Room Relay Block
*2	Fusible Link Block
*3	ABS NO. 1 Fuse

REPLACE FUSIBLE LINK BLOCK (ABS NO. 1 FUSE)

4.	INSPECT SKID CONTROL ECU (+BM TERMINAL)

(a) Install the fusible link block to the engine room relay block.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-2 (+BM) - Body ground	Always	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU))

REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)

5.	INSPECT SKID CONTROL ECU (GND2 TERMINAL)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A42-1 (GND2) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU))

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)

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