C1235
DTC C1235 PRESSURE SENSOR (PRIMARY)-ELECTRICALCOMPONENT LOCATION
GENERAL DESCRIPTION
The pressure sensor, installed in the HECU, sense the brake oil pressure to judge driver's brake intention when ESC is operating. If pressure of master cylinder is applied to pressure sensor, the strain of the piezo element is changed and then the resistance of bridge circuit is changed according to changed strain. Therefore this changed resistance changes output voltage of bridge 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
Each unfiltered input signal voltage is monitored to be in the range of 4.7 V less than input signal voltage less than 5.3 V. A failure is detected if the output signal value is out of specified range for more than 100 ms or pressure sensor self test form is out of specification during self test.
DTC DETECTING CONDITION
MONITOR SCANTOOL DATA
1. Connect scan tool to Data Link Connector (DLC)
2. Ignition "ON" & Engine "ON".
3. Press the brake pedal.
4. Monitor the "Pressure Sensor" parameter on the scan tool.
5. Whenever brake pedal is pushed down, is the pressure sensors scan tool data changed?
YES
>Fault is caused by having been repaired and HECU memory was not cleared, Clear the DTC and then go to "Verification Of Vehicle Repair" procedure.
No
>Go to "Component Inspection" procedure.
COMPONENT INSPECTION
1. Ignition "OFF".
2. Ignition "ON".
3. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
4. Using a scan tool, Clear DTC.
5. Select "Diagnostic Trouble Codes (DTCs)" mode again.
6. Are any DTCs present?
YES
>Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU and then go to "Verification Of Vehicle Repair" procedure.
No
>Fault is intermittent caused by faulty HECU or was repaired and HECU memory was not cleared. go to "Verification Of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
Refer to DTC C1101. C1101