CITROEN Xsara Bosch 5.3 system

SELF-DIAGNOSIS

General information: · ECU includes self diagnostic function. · In the event of a system failure the ABS warning light will come on. · Trouble codes can be obtained by using a suitable code reader connected to the data link connector(DLC)
or diagnostic socket(fig 1). Citroen Xsara : ECU fault code identification.

FAULT CODE IDENTIFICATION

Fault code Fault location
1
Pump motor
2
System relay
2
Pump motor relay
3
Left rear, wheel speed sensor
4
Left rear-signal, wheel speed sensor
5
Right front, wheel speed sensor
6
Right front-signal, wheel speed sensor
7
Right rear, wheel speed sensor
8
Right rear-signal, wheel speed sensor
9
Left front, wheel speed sensor
10
Left front-signal, wheel speed sensor
11
Left rear, hydraulic modulator solenoid valve
12
Front right, hydraulic modulator solenoid valve
13
Right rear, hydraulic modulator solenoid valve
14
Left front, hydraulic modulator solenoid valve
15
Wheel speed sensor toothed rings
16
Brake pedal position (BPP)switch
17
ECU(Electronic control unit)
18
Battery voltage

WARNING LAMP

Correct operating sequence: -Turn ignition on -Lamp switches on -Lamp goes out after approximately 2 seconds.

GENERAL TEST PROCEDURES

When doing these make sure correct test probes are used to avoid damaging the ECU harness multi-plug terminals.
 Warning lamp circuit
The ECU harness multi-plug may contain a switch function so, if disconnected, the warning lamp will switch on.

HOW TO CHECK

(refer to fig 2) - Switch the ignition on. - Make sure warning lamp comes on. - If it doesn't, switch off ignition. - Check the fuses. - Disconnect the ECU multi-plug. - Switch the ignition back on. - Check warning lamp comes on. - If it doesn't, switch off ignition. - Bridge the harness multi-plug terminals 19 & 21 for 1997 to 98 models. - Bridge the harness multi-plug terminals 19 & 20 for 1999 onwards models. - Switch the ignition back on. - check if the warning lamp comes on. - If it doesn't again, switch the ignition off again. - Now check the wiring and bulb.
Citroen Xsara : ECU fault code identification.