12 · Diagnostics

D21 Engine stops on the move

DiagnosisD21 Engine stops on the move · page 1 of 2

When driving with the engine hot, it suddenly goes off. After a few moments it can be started again with the usual starting procedure.

If it does not start again, See Diagnosis B11

Step	Validity	Operation to be performed	Test results
Step	Validity	Operation to be performed	OK	⚠	🔧
1	CHECK WITH DIAGNOSTIC TOOL	Connect the diagnostic tool (Examiner or other tool) to the diagnostic socket. Check for: – absence of faults in the engine ECU – plausibility of all parameters	All OK Go to Step 2	Problems found	Intervention
			All OK Go to Step 2	Failed conversation with the ECU	Restore connection between the engine ECU and the diagnostic socket (Wiring diagram: E5030 “PETROL ENGINE ELECTRONIC MANAGEMENT”)
			Error detected in the ECU	Continue as shown by the diagnostic tool
2	ROAD TEST AND FUEL PRESSURE	Perform a road test and check the fuel supply pressure PROCEDURE OP. 0510C10	All OK Go to Step 3	Problems found Incorrect pressure	Intervention Check the circuit components in sequence: – fuel pump PROCEDURE OP. 1040A70 – fuel filter PROCEDURE OP. 1044B10 – fuel hoses PROCEDURE 1040 B
2	ROAD TEST AND FUEL PRESSURE		3	ROAD TEST WITH DIAGNOSTIC TOOL	Perform a road test after connecting the diagnostic tool (Examiner or other tool) to the diagnostic socket. Check for: – absence of faults in the engine ECU	All OK Go to Step 4	Problems found Absence of dialogue between ECU and diagnostic tool	Intervention Restore engine ECU power and earth connections (Wiring diagram: E5030 “PETROL ENGINE ELECTRONIC MANAGEMENT”)
Sudden error detected in ECU	Continue as shown by the diagnostic tool					All OK Go to Step 4

(Cont..)

Parts & tools for this job For 1998 Fiat Seicento

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