Open in ABS Solenoid Relay Circuit - Vehicle Stability Control System (from 12/2010)

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C0278/11,C0279/12: Open in ABS Solenoid Relay Circuit
C0279/12 - Short to B+ in ABS Solenoid Relay Circuit

DESCRIPTION

The ABS solenoid relay supplies power to the ABS solenoid and TRAC solenoid.

The solenoid relay is turned on 1.5 seconds after the ignition switch is turned on (IG), and is turned off if an open or short in the solenoid is detected by self diagnosis performed when the vehicle starts running.

The ABS solenoid relay is housed in the skid control ECU in the ABS & TRACTION actuator assembly.

HINT
If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU, with the ignition switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.

WIRING DIAGRAM

Refer to DTCs C0226/21, C0236/22, C0246/23, C0256/24 and C1225/25 Vehicle Stability Control System (from 12/2010).

INSPECTION PROCEDURE

NOTICE:
When replacing the ABS & TRACTION actuator assembly, perform zero point calibration Calibration (from 12/2010).

HINT
When C1241/41 is output along with C0278/11, inspect and repair the trouble areas indicated by C1241/41 first.

PROCEDURE

1. INSPECT FUSE (ABS/VSC NO.2 FUSE)

(a) Remove the ABS/VSC No. 2 fuse from the engine room relay block.

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

Standard resistance:

NG -- CHECK FOR SHORT IN ALL HARNESS AND CONNECTOR CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.

2. INSPECT SKID CONTROL ECU (+BS TERMINAL AND GND CIRCUIT)

(a) Disconnect the skid control ECU connector.

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

Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (+BS, GND1 CIRCUIT)
OK -- Continue to next step.

3. RECONFIRM DTC

(a) Reconnect the skid control ECU connector.

(b) Clear the DTC DTC Check / Clear (from 12/2010).

(c) Start the engine.

(d) Check that the same DTC is recorded DTC Check / Clear (from 12/2010).

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

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 ABS & TRACTION actuator assembly. Make sure that no DTCs are output.
* If any DTCs are output while jigging a connector or wire harness of the ABS & TRACTION actuator (skid control ECU), inspect and repair the connector or wire harness.

HINT
It is suspected that the DTCs were output due to a bad connection of the connector terminal.

B -- REPLACE ABS & TRACTION ACTUATOR ASSEMBLY

A -- END