Anti-Lock Brake System

BRAKE CONTROL: ANTI-LOCK BRAKE SYSTEM: C0273/13,C0274/14: Open or Short Circuit in ABS Motor Relay Circuit
C0274/14 - Short to B+ in ABS Motor Relay Circuit

DESCRIPTION

The ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the skid control ECU switches the motor relay ON and operates the ABS pump motor.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

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

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Select the Active Test mode on the Techstream Data List / Active Test.

(e) Check the operating sound of the ABS motor relay when operating it with the Techstream.

ABS/VSC/TRAC





OK:

The operation sound of the ABS motor should be heard.

NG -- RECONFIRM DTC
OK -- Continue to next step.

2. INSPECT SKID CONTROL ECU (+BM TERMINAL)

(a) Turn the ignition switch off.

(b) Disconnect the skid control ECU connector.

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





Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)
OK -- Continue to next step.

3. INSPECT SKID CONTROL ECU (GND TERMINAL)

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





Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK -- Continue to next step.

4. RECONFIRM DTC

(a) Clear the DTC ABS (Antilock Brake System).

(b) Start the engine.

(c) Drive the vehicle at the speed of 10 km/h (6 mph) or more to activate initial check.

(d) Check if the same DTC is recorded ABS (Antilock Brake System).

Result





B -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) How To Proceed With Troubleshooting

A -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal