Vehicle Stability Control System (from 12/2010)

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C0273/13, C0274/14, C1361/91: Open in ABS Motor Relay Circuit
C1361/91 - Short Circuit in ABS Motor Fail Safe Relay Circuit

DESCRIPTION

If a DTC of the motor line is stored, the VSC No. 2 relay cuts off the power supply to the VSC No. 1 relay and performs fail-safe.

While any of the ABS, TRAC, VSC, or BA is operating, the skid control ECU (housed in the ABS & TRACTION actuator assembly) turns the VSC No. 2 relay on and activates the pump motor in the ABS & TRACTION actuator.

This code may be stored if the motor relay (+BM) voltage becomes lower than the DTC detecting condition due to insufficient output from the battery or alternator.

WIRING DIAGRAM

INSPECTION PROCEDURE

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

PROCEDURE

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

(a) Remove the ABS/VSC No. 1 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 VSC NO.2 RELAY

(a) Remove the VSC No. 2 relay.

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

Standard resistance:

NG -- REPLACE VSC NO.2 RELAY
OK -- Continue to next step.

3. INSPECT VSC NO.1 RELAY

(a) Remove the VSC No. 1 relay.

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

Standard resistance:

NG -- REPLACE VSC NO.1 RELAY
OK -- Continue to next step.

4. INSPECT ENGINE ROOM RELAY BLOCK (POWER SOURCE CIRCUIT)

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

Standard voltage:

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

5. INSPECT ENGINE ROOM RELAY BLOCK

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

Standard resistance:

NG -- REPAIR OR REPLACE ENGINE ROOM RELAY BLOCK
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM RELAY BLOCK)

(a) Disconnect the skid control ECU connector.

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

Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. RECONFIRM DTC

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

(b) Start the engine.

(c) Drive the vehicle at the speed of 6 km/h (4 mph) or more.

(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 a speed signal of 6 km/h (4 mph) 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.
* If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harness, 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