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Fiat Seicento Factory Service Manual (1998-2010)12 · Diagnosis
12 · Diagnostics

F20 ABS working irregularly

Make
Fiat
Model
Seicento Factory Service Manual
Year
1998–2010
Section
Brakes › F20 ABS working irregularly
DiagnosisF20 ABS working irregularly

F20 ABS working irregularly

Operating the brakes suddenly and forcefully (“panic” braking), the ABS does not work correctly. Consequently, one or more wheels are partially locked.

Step Validity Operation to be performed Test results
OK Problems found Intervention
1 CHECK "ABS FAULT" WARNING LIGHT

Turn the key to MAR and check whether the "ABS fault" warning light comes on for 4 seconds and then comes off

 All OK
Go to Step 2		 The "ABS fault" warning light comes on and stays on See table K60
2 CHECK WITH DIAGNOSTIC TOOL

Connect diagnostic tool (Examiner or other tool) to the diagnostic socket. Check in sequence:
– no faults in ABS ECU
– plausibility of all parameters

 All OK
Go to Step 3		 Failed dialogue with ECU Restore connection between ABS ECU and diagnostic socket
(Wiring diagram: E7020 "ABS")
Detected error in ECU Continue as shown by the diagnostic tool
3 PERFORM ACTIVE TEST WITH DIAGNOSTIC TOOL

With the diagnostic tool (Examiner or other tool) perform the following active tests:
– pump motor;
– solenoid valves;
– speed sensors

 All OK
Go to Step 4		 Error detected in pump or in a solenoid valve Replace electric hydraulic unit ECU
PROCEDURE OP. 3340A10
Error detected in sensor Replace sensor
PROCEDURE OP. 3340A30 (front) or 3340A34 (rear). If the fault persists, check intactness and cleanliness of wheel hub
4 CHECK CORRECT OPERATION

Check the fault is no longer present

 All OK
End of test		 – –

Parts & tools for this job For 1998 Fiat Seicento

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