B1390

Read the instructions below then start the fault diagnostic procedure.

Symptom: ABS warning lamp on, no ABS function.

B1390

Fault symptom

ABS warning lamp on, no ABS function.

Condition

The speed of each wheel is compared with a reference speed (=filtered average value of all wheel speeds).

•	One wheel speed >25%% higher than the reference speed for 20 seconds.

•	Two wheel speeds >6%% higher than the reference speed for 80 seconds.

•	One wheel speed <6%% lower than the reference speed for 20 seconds, or two wheel speeds for 10 seconds.

•	Continual ABS modulation for more than 60 seconds.

Diagnostic help

•	A reading of the signal from the wheel sensor on any wheel can be obtained with the ISAT scan tool.

-	Select "READ FUNCTIONS".

-	Select "WHEEL SPEEDS"

The current wheel speed in km/h is displayed.