ABS (Antilock Brake System)

BRAKE CONTROL: ANTI-LOCK BRAKE SYSTEM: C0273/13: Open in ABS Motor Relay Circuit

DTC C0273/13 - Open in ABS Motor Relay Circuit

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.






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: When C1241/41 is output together with C0273/13, inspect and repair the trouble areas indicated by C1241/41.

PROCEDURE

1. INSPECT FUSE (ABS/VSC NO.1 FUSE)





(a) Remove the ABS/VSC No.1 fuse from the engine room R/B.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- INSPECT FOR SHORT IN ALL COMPONENTS CONNECTED TO FUSE AND REPAIR OR REPLACE THEM IF NEEDED, AND REPLACE FUSE
OK -- Continue to next step.
2. INSPECT SKID CONTROL ECU CONNECTOR (+BM TERMINAL VOLTAGE)





(a) Disconnect the skid control ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)
OK -- Continue to next step.
3. INSPECT SKID CONTROL ECU CONNECTOR (GND TERMINAL CONTINUITY)





(a) Disconnect the skid control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)
OK -- Continue to next step.
4. PERFORM ACTIVE TEST USING TECHSTREAM (ABS MOTOR RELAY)
(a) Connect Techstream to the DLC3.
(b) Start the engine.
(c) Select "ACTIVE TEST" on Techstream.

ACTIVE TEST: ABS / VSC / TRAC





(d) Check the operating sound of the ABS motor relay when operating it with Techstream.
OK:
The operating sound of the ABS motor relay should be heard.
NG -- REPLACE BRAKE ACTUATOR ASSEMBLY
OK -- Continue to next step.
5. 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) Clear the DTC.
(b) Start the engine.
(c) Drive the vehicle at the speed of 12 mph (20 km/h) or more for 30 seconds or more.
(d) Check that the same DTC is recorded.
Result:





HINT:
- If the normal system code is output (the malfunction code is not output), slightly jiggle the connectors, wire harnesses, 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 (skid control ECU), inspect and repair the connector or wire harness.
- These DTCs may be stored due to a malfunction in the connector terminal connection, etc.

B -- REPLACE BRAKE ACTUATOR ASSEMBLY
A -- END