Citroen C4 l 2004 front left ABS wheel speed sensor fault.

[citc16V]

Citroen C4 l 2004 front left ABS wheel speed sensor fault.

Hi, ABS and ESP lights up on the dashboard.

Im getting a reading on Kph when driving on three sensors, except for the front left one.

The left front wheel speed sensor has been replaced plus the ESP module and pump, and the brake-light switch (7800)

(See schematic)

Left front wheel sensor umplugged and connector to ESP module (7800) unplugged.

Measured ohm

7002U to 7001U = IO


7002U to connector (7800) = 0.0 ohm


7001U to connector (7800) = 0.0 ohm


7002U - 7001U to GND = IO


7002U - 7001U to 70012U - 7011U - 7022U - 7021U - 7032U - 7031U = IO


MC702 to GND 0.0 ohm


ME702 to GND 0.0 ohm


Left/right front wheel sensors umplugged and connector to ESP module (7800) plugged in - car is running.

Measured VDC

7002U to GND = 14 VDC - problem here?


7012U to GND = 0.2 VDC




Hope someone has some advice.

Help is much appreciated.

Best regards.