Vehicle Stability Control System (For BOSCH Made)

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for BOSCH Made): C0273/13: Open or Short Circuit in ABS Motor Relay Circuit
C0273/13 - Open or Short Circuit in ABS Motor Relay Circuit

DESCRIPTION

The ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU switches 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.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
* When C1241/41 is output together with C0273/13, inspect and repair the trouble areas indicated by C1241/41 C1241.
* Check the condition of each related circuit connector before troubleshooting Electronic Circuit Inspection Procedure.

PROCEDURE

1. INSPECT FUSIBLE LINK (ABS NO. 1 FUSE)

(a) Remove the fusible link from the engine room R/B.





(b) Check if the fusible link is malted.

OK:

The fusible link is not melted.

(c) Install the fusible link to the engine room R/B with the nut.

Torque : 5.4 Nm (55 kgf-cm, 48 in-lbf)

NG -- REPLACE FUSIBLE LINK
OK -- Continue to next step.

2. INSPECT SKID CONTROL ECU (+BM TERMINAL VOLTAGE)

(a) Disconnect the skid control ECU connector.





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

Standard voltage:





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

3. INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)

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





Standard resistance:





(b) Connect the connector.

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

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

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch on (IG).

(c) Select "Active Test" on the Techstream Data List / Active Test.

ABS / VSC / TRAC





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

OK:

The operating sound of the ABS motor relay is heard.

NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
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 located 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 Vehicle Stability Control System (for BOSCH Made).

(b) Start the engine.

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

(d) Check if the same DTC is recorded Vehicle Stability Control System (for BOSCH Made).

HINT
Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result:





HINT
* 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 (skid control ECU). 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.

B -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal

A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Diagnosis System