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).
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.
