B2450

Symptom: ABS (ANTI LOCK) warning lamp on, no ABS function.

B2450

Fault symptom

ABS (ANTI LOCK) warning lamp on, no ABS function.

Condition

The trouble code is generated when the ignition is switched on and the control module performs a test of the solenoid valves. The main relay operates briefly twice and then releases. The indicator lamp goes out briefly before it lights up and stays on.

Diagnostic procedure

1 Check the valve

-	Jack up the car and check the solenoid valve for the left-hand front wheel with the ISAT scan tool command "VALVE TEST FL" in the "ACTIVATE" menu.

-	Turn to for a description of the ISAT scan tool's testing procedure for the solenoid valves.

Test OK?

yes

Continue with point 3.

no

Continue with point 2.

2 Check the resistance of the valve

-

Remove the cover over the control module. Unplug the solenoid valve's 6-pin connector from the control module. Note The connector is a tight fit. Check the solenoid valve's coil by taking a resistance reading across pins 1 and 2 of the connector. A reading of about 0.7 to 1.7 ohms should be obtained.

Is the resistance reading OK?

yes

Continue with point 3.

no

Change the hydraulic unit.

3 Final check

-	Clear the diagnostic trouble code.

-	Drive the car at varying engine loads and rpm for 5 minutes.

-	Read the diagnostic trouble code.

Is the diagnostic trouble code stored?

yes

Continue with

no

The diagnostic procedure carried out was correct or the fault is of an intermittent nature.