DTC C2402 Motor-Electrical: DTC Detecting Condition

DTC DETECTING CONDITION CHART

Item		Detecting Condition	Possible cause
DTC strategy		Voltage monitoring	Open or short of power supply circuit (ABS1) Inoperative HECU
Case1 (Stop monitor)	Monitoring Period	Stop monitor is active if the pump is off i.e. not actuation and no Slowdown.
	Enable Conditions	A failure is detected if the pump motor voltage > 2.0 V for more than 1 s.
	Fail Safe	The return pump does not work correct. The ABS/ESC functions are inhibited, reduced function of the EBD system. The ABS/EBD/ESC warning lamps are activated.
Case2 (Pump run monitor)	Monitoring Period	The monitor is active if the pump is switched on
	Enable Conditions	A failure is detected if the pump motor voltage < (battery voltage - 4.0 V) for more than 100ms.
	Fail Safe	Pressure decrease (outlet valve) is no longer possible. The ABS/ESC functions are inhibited, reduced function of the EBD system. The ABS/EBD/ESC warning lamps are activated.
Case3 (Pump slowdown monitor)	Monitoring Period	Monitor is always active in the transition "pump on → pump off"
	Enable Conditions	After the end of the actuation of the motor relay has, the pump motor is still in motion and is generating a Voltage during it.s slowdown. The generated UM is monitored for a certain time on high level. The time depends on the supply voltage and is in the range of t = 30 ms to t = 125 ms. If the slow down condition isn't met, the pump is activated again (see actuation times below) and the slowdown time is measured again. This is repeated for maximum n = 3 times. If, after the last pump activation, the pump motor slowdown time is still to short, a failure is detected. Actuation times: 1st actuation: 200 ms 2nd actuation: 1000 ms 3rd actuation: 3000 ms
	Fail Safe	Pressure decrease (outlet valve) is no longer possible. The ABS/ESC functions are inhibited, reduced function of the EBD system. The ABS/EBD/ESC warning lamps are activated.