Vehicle Stability Control System (from 12/2010)

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1246/46, C1281/81: Master Cylinder Pressure Sensor Malfunction
C1281/81 - Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC)

DESCRIPTION

Master cylinder pressure sensor is connected to the skid control ECU in the ABS & TRACTION actuator assembly.

DTC C1281/81 is output only in the Test Mode.









INSPECTION PROCEDURE

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

PROCEDURE

1. INSPECT STOP LIGHT OPERATION

(a) Check that the stop light comes on when the brake pedal is depressed and goes off when the brake pedal is released.

OK:





NG -- CHECK STOP LIGHT CIRCUIT
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (MASTER CYLINDER PRESSURE SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Select the Data List mode on the Techstream.

ABS/VSC/TRAC





(d) Check that the brake fluid pressure value of the master cylinder pressure sensor observed on the Techstream changes when the brake pedal is depressed.

OK:

When the pedal is depressed, voltage displayed on the Techstream increases.

NG -- REPLACE ABS & TRACTION ACTUATOR ASSEMBLY
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

(a) Select the Data List mode on the Techstream.

ABS/VSC/TRAC





(b) Check that the stop light observed on the Techstream changes when the brake pedal is depressed.

OK:

When the brake pedal is depressed, the Techstream displays "ON".

NG -- REPLACE ABS & TRACTION ACTUATOR ASSEMBLY
OK -- Continue to next step.

4. RECONFIRM DTC

(a) Turn the ignition switch off.

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

(c) Start the engine.

(d) At a speed of 30 km/h (18 mph) or more, drive the vehicle and perform braking test (decelerate the vehicle by depressing the brake pedal).

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

Result:





HINT
These DTCs may be restored due to a malfunction in the connector terminal connection, etc.

B -- REPLACE ABS & TRACTION ACTUATOR ASSEMBLY

A -- END