C1235 Primary Pressure Sensor-Electrical - Automotive Repair Guides & Equipment

COMPONENT LOCATION

GENERAL DESCRIPTION

The pressure sensor, installed in the HECU, sense the brake oil pressure to judge driver’s brake intention when ESP is operating.

If pressure of master cyclinder is applied to pressure sensor, the strain of the piezo element is changed and then the resistance of brige circuit is chanded according to changed strain.

Therefore this changed resistance changes output voltage of brige circuit and output voltage changes linearly.

The sensor output is a analog signal in proportion to supply voltage, and the HECU recognizes a pressure value according to signal ratio about supply voltage.

DTC DESCRIPTION

A failure is detected if the output signal voltage of the pressure sensor is out of specified range.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible cause

DTC Strategy

Voltage Monitoring

Open or short of pressure sensor circuit

Faulty pressure sensor

Enable Conditions

The output signal voltage of the pressure sensor is out of the specified range.

– The monitoring starts 1sec after power up.

Fail Safe

Inhibit the ESP control and allow the ABS/EBD control.

The ESP warning lamp is activated.

DIAGNOSTIC CIRCUIT DIAGRAM

COMPONENT INSPECTION

1.	Ignition “OFF”.

2.	Ignition “ON” & Engine “OFF”.

3.	Connect scantool and select “Diagnostic Trouble Codes(DTCs)” mode.

4.	Using a scantool, Clear DTC.

5.	Select “Diagnostic Trouble Codes(DTCs)” mode again.

Are any DTCs present ?

	▶ Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU
	▶ This fault may be intermittently caused.

New Videos on our YouTube Channel Every Week, Subscribe Now!

Related Posts