22 · Diagnostics

Abs working irregularly

Make: Fiat
Model: Multipla Factory Service Manual
Year: 1998–2010
Section: Braking system › Abs working irregularly

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Fault diagnosisAbs working irregularly

ABS WORKING IRREGULARLY

When the brakes are operated vigorously and suddenly ("panic" braking), the ABS does not work properly, so one or more wheels lock(s).

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Turn the ignition on and check that the "ABS fault" warning light comes on for about 4 seconds, and then goes out.	Continue to Step 1	The "ABS fault" warning light comes on and stays on	See table K60 ABS FAILURE WARNING LIGHT ON
1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket Check: that there are no faults in the ABS control unit plausibility of all the parameters	Continue to Step 2	An error is detected in the control unit	Continue according to the instructions for the diagnostic equipment
			Lack of dialogue with the control unit	Restore the connection between the ABS control unit and the diagnostic connector ( See E7020 ABS)
			Fault detected in a front sensor	Replace the sensor Op. 3340A30
			Fault detected in a rear sensor	Replace the sensor Op. 3340A34
			Fault detected in a front wheel hub	Replace the wheel hub Op. 4450C10
			Fault detected in a rear wheel hub	Replace the wheel hub Op. 4450D10
2	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of: pump motor solenoids	Continue to Step 3	Fault detected in one solenoid	Replace electrohydraulic unit-electronic control unit Op. 3340A12
3	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Search for the fault starting from another symptom'

‹ Prev Brake pedal hard Next › Abs not working / (one wheel locked)

Parts & tools for this job For 1998 Fiat Multipla

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