C0202

DTC C0201-C0204





Test 1-7





Test 8-15

Circuit Description
The EBCM uses the input from the master cylinder pressure sensor for more accurate braking control during a vehicle stability enhancement system (VSES) event. The master cylinder pressure is directly proportional to the amount of force that is applied to the brake pedal.

Conditions for Running the DTC
C0201, C0202, C0203
The ignition is ON.

C0204
The vehicle is decelerating with the master cylinder pressure greater than 1400 kPa (200 psi) and all of the following are true:
^ The vehicle is driven relatively straight forward at a speed greater than 19 km/h (12 mph).
^ The throttle position is less than 5 percent.
^ The vehicle is in DRIVE.
^ The parking brake is released.

Conditions for Setting the DTC
C0201
The master cylinder pressure sensor circuitry is detected as open or shorted for 200 milliseconds.

C0202
The master cylinder pressure sensor signal indicates a sudden change in the master cylinder pressure which exceeds a physical limitation.

C0203
Either of the following conditions may cause DTC C0203 to set:
^ The zero-pressure signal voltage is detected as being out of range by at least 0.25 volts.
^ The brake switch is closed and the master cylinder pressure is greater than 862 kPa (125 psi) for 500 milliseconds, followed by the application of the brake for 200 milliseconds.

C0204
The master cylinder pressure sensor signal indicates a change in master cylinder pressure which does not correlate with the signals from other sensors.

Action Taken When the DTC Sets
^ The EBCM disables the VSES.
^ The message center displays the SERVICE STABILITY SYSTEM message.

Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.

Diagnostic Aids
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
4. This step tests the sensor circuitry in the low voltage range.
5. This step tests the sensor circuitry in the high voltage range.
6. This step tests the pressure transducer low reference circuit.