Vehicle Stability Control System (For ADVICS Made)

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for ADVICS Made): 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. 1 (fail safe) relay cuts off the power supply to the VSC NO. 2 relay and performs fail safe.

While any of the ABS, TRAC, VSC, or BA is operating, the skid control ECU (housed in the actuator assembly) turns the VSC NO. 2 relay on and activates the pump motor in the brake 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 brake actuator assembly, perform zero point calibration Programming and Relearning.

PROCEDURE

1. INSPECT ABS NO. 1 FUSE

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





(b) Check if the fusible link is melted.





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 (ABS NO. 1 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 (FAIL SAFE) RELAY

(a) Remove the VSC NO. 1 (fail safe) relay.





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

Standard resistance:





NG -- REPLACE VSC NO. 1 (FAIL SAFE) RELAY
OK -- Continue to next step.

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

(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 Vehicle Stability Control System (for ADVICS Made).

(b) Start the engine.

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

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

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

Result:





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.
* 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. 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.

B -- REPLACE BRAKE ACTUATOR ASSEMBLY

A -- USE SIMULATION METHOD TO CHECK