22 · Diagnostics

Abs working irregularly

Fault diagnosisAbs working irregularly · page 1 of 2

ABS WORKING IRREGULARLY

The ABS warning light does not come on and system is observed to work irregularly.

1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the Examiner diagnostic equipment to the diagnostic connector and check the following at the brake nodes: For faults in error mode In the parameters ambient, the plausibility of all the parameters In the active diagnosis ambient, the operation of the ABS warning light	Continue to Step 2	Presence of faults	Continue according to the instructions for the diagnostic equipment
		Continue to Step 2	The warning light does not come on	Continue according to the instructions in See table See table K61 ABS WARNING LIGHT OFF / (DO NOT CARRY OUT INITIAL TEST)
2	CHECKING BRAKE HYDRAULIC SYSTEM	All OK	Problems met	Operation
	Disconnect the ABS electrical connection and test the efficiency of the braking system with the aid of a service rig.	Continue to Step 3	Braking action not balanced	Overhaul the braking system
3	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present The test is essential, as the braking system is a safety feature of the car	End of diagnosis	Fault persists	Replace the brake system hydraulic unit Op. Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT

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