C1235

DTC C1235 PRESSURE SENSOR (PRIMARY) - ELECTRICAL

GENERAL DESCRIPTION
Master cylinder pressure sensor is used for detecting the pressure delivered to wheels when the brake system is working.

DTC DESCRIPTION
This code shows in case that there is an open or short in the circuit of the pressure sensor.

DTC Detecting Condition:

FAIL-SAFE FUNCTION
The ESC function is inhibited, while the ABS and EBD controls allowed.
The ESC warning lamp is ON, but the ABS and EBD warning lamps OFF.

INSPECTION PROCEDURE
1. CHECK INSTALLING OF PRESSURE SENSOR
1. Check if the pressure sensor is properly installed on the master cylinder.
Is the pressure sensor installed properly?

NO - Reinstall the pressure sensor properly.

YES - Check power of pressure sensor.

2. CHECK POWER OF PRESSURE SENSOR
1. Disconnect the pressure sensor connector, and measure the voltage between terminals 1 (-) and 3 (+) of the pressure sensor connector.

Specification: 4.8 - 5.2 V

Is the voltage within the specification?

NO - Check harness and connector between the HECU and the pressure sensor.

YES - Check output voltage of pressure sensor

3. CHECK OUTPUT VOLTAGE OF PRESSURE SENSOR
1. Measure the voltage between terminal 2 of the pressure sensor connector and the body ground.

Specification: 0.5 - 4.5 V

Is the output voltage within the specification?

YES - Check harness and connector of the pressure sensor. If no error on the harness and the connector, replace the pressure sensor and recheck.

NO - Check output voltage of HECU connector.

4. CHECK OUTPUT VOLTAGE OF HECU CONNECTOR
1. Measure the voltage between terminal 12 of the HECU connector and the body ground.

Specification: 0.5 - 4.5 V

Is the voltage within the specification?

NO - Repair harness and connector between the HECU and the pressure sensor.

YES - After clearing the DTC and driving the vehicle at 40 Km/h speed or more, if the ESC lamp is ON and the same DTC shows again, replace the HECU and recheck.