12 · Diagnostics

X01 Excessive fuel consumption

DiagnosisX01 Excessive fuel consumption · page 1 of 2

The engine is apparently running normally but fuel consumption is higher than previously registered during the vehicle's life.

NOTE: Preliminarily check:
– air cleaner conditions
– spark plug conditions

Step	Validity	Operation to be performed	Test results
Step	Validity	Operation to be performed	All OK	Problems found	Intervention
1		CHECK WITH DIAGNOSTIC TOOL Connect diagnostic tool (Examiner or other tool) to the diagnostic socket. Check: – no faults in engine ECU – plausibility of all parameters	Go to Step 2	Detected error in ECU	Continue as shown by the diagnostic tool
	Failed dialogue with ECU	Restore connection between engine ECU and diagnostic socket (Wiring diagram: E5030 "ELECTRONIC ENGINE MANAGEMENT")
	2		CHECK FUEL PRESSURE Check fuel feed pressure PROCEDURE OP. 0510C10	Go to Step 3	Incorrect pressure (high pressure is a sign of excessive consumption)	Check the following circuit parts, in sequence: – fuel filter PROCEDURE OP. 1044B10 – pressure regulator – fuel lines PROCEDURE 1040 B

3			CHECK INJECTORS With the diagnostic tool (Examiner or other tool) perform the active injector test	Go to Step 4	Faulty injector	Restore connection between injector and ECU, (Wiring diagram: E5030 "PETROL ENGINE ELECTRONIC MANAGEMENT ") or replace injector PROCEDURE OP. 1056A70

(Cont..)

Parts & tools for this job For 1998 Fiat Seicento

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.