C1235 Primary Pressure Sensor-Electrical: DTC Detecting Condition

Item		Detecting Condition	Possible cause
DTC Strategy		Voltage Monitoring	Open or short of pressure sensor circuit Faulty pressure sensor Faulty HECU
Case1	Monitoring Period	Continuous
Case1	Enable Conditions	A sensor supply failure is detected if Sensor Supply Voltage > 5.3V or Sensor Supply Voltage < 4.7V for t >= 60ms
Case2	Monitoring Period	Continuous
Case2	Enable Conditions	A Fault is set if the DSO signal is voltage of DSO > 4.7V or voltage of DSO < 0.3V for a time t >= 100ms. DSO : original pressure value.
Case3	Monitoring Period	Continuous
Case3	Enable Conditions	A Fault is set if the DSI signal is voltage of DSI > 4.7V or voltage of DSI < 0.3V for a time t >= 100ms. DSI: inverted pressure value.
Case4	Monitoring Period	Continuous
Case4	Enable Conditions	A Fault is set if the voltage of DSO + DSI > 5.5V or voltage of DSO + DSI < 4.5V for a time t >= 100ms. DSO : original pressure value. DSI: inverted pressure value.
Case 5	Monitoring Period	Once during Power Up
Case 5	Enable Conditions	POS detects internal sensor malfunctions (sensor element, amplification, etc.). The POS is triggered if no low voltage is present and supply voltage is switched on. The test phase is divided in two 60 ms parts. DSO signal must be < 0.5V for 30 ms. In phase 2 DSO signal must be between 1.9V and 3.1V for also 30 ms then the POS Test is passed. The test phase is divided in two 60 ms parts. DSO and DSI signal must be < 0.5V for 30 ms. In phase 2 DSO and DSI signal must be between 1.9V and 3.1 V for also 30 ms then the POS Test is passed. A fault is set if POS does not satisfy the above conditions. POS : Power on self-test.
Fail Safe		No Pressure Signal available. Sensor failure outside the ABS control cycle Only the ABS/ESC functions are inhibited, allow the EBD. The ABS/ESC warning lamps are activated and the EBD warning lamp is not activated. Sensor failure inside the ABS control cycle Inhibit the ESC control, allow the EBD. The ESC warning lamps are activated. After the control, the ABS functions are inhibited. The ABS warning lamps are activated.