Engine cuts out when idling (then restars)

Make: Fiat
Model: 500 Factory Service Manual
Year: 2007–2024
Section: Engine › Engine cuts out when idling (then restars)

‹ Prev The engine accelerates without pressing the accelerator pedal Next › Engine cuts out whilst running (then does not restart)

Fault diagnosisEngine cuts out when idling (then restars)

ENGINE CUTS OUT WHEN IDLING (THEN RESTARS)

1.2 8v, 1.4 16v

The customer complains that: The engine cuts out whilst it is running; it can be restarted

1	FUEL SUPPLY CIRCUIT CHECKS	All OK	Problems encountered	Operation
		Test results
	Check that the air intake/vacuum circuit is working properly Check the condition of the fuel supply circuit and make sure that it is working properly Also check: wiring on engine correctly fastened to earth; battery correctly fastened to earth; positive battery terminal and all leads connected to it correctly fastened	Move on to Step 2	1. Supply fastenings slack or oxidized 2. Earth fastenings slack or oxidized	1. Restore correct fastenings See E1010 POWER SUPPLY 2. Restore correct fastenings See E1010 POWER SUPPLY
2	CHECK USING THE EXAMINER	All OK	Problems encountered	Operation
	With the Examiner connected to the engine control unit, check for the presence of any errors	Move on to Step 3	Presence of errors	Continue as instructed by the diagnostic equipment
3	MOTORIZED THROTTLE CHECK	All OK	Problems encountered	Operation
	Check that the motorized throttle is working properly Check the continuity/insulation of the wiring between the engine control unit and the motorized throttle by carrying out the See Test 1056BW THROTTLE BODY ACTUATOR OPERATION CHECK	End of diagnosis	1. Motorized throttle defective 2. Wiring defective	1. Replace the motorized throttle Op. 1056B14 2. Restore correct wiring.

1.3 Multijet

The customer complains that: The engine cuts out whilst it is running; it can be restarted.

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Test results
	Check: Wiring on engine correctly fastened to earth; Battery correctly fastened to earth; Positive battery pole and all leads connected to it are correctly fastened Leaks from the low pressure diesel circuit. Leaks from high pressure diesel circuit. Fuel level okay	Move on to Step 1	1. Supply fastenings slack or oxidized. 2. Earth fastenings slack or oxidized 3. Leaks from the low pressure circuit. 4. Leaks from high pressure circuit 5. Fuel level too low	1. Restore correct fastenings See E1010 POWER SUPPLY 2. Restore correct fastenings See E1010 POWER SUPPLY 3. Restore correct system seal. 4. Restore correct system seal. 5. Top up the fuel to the correct level.
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the Examiner to the engine management control unit and check that there are no errors	End of diagnosis	Presence of errors	Continue as instructed by the diagnostic equipment.
2	INJECTOR SEAL CHECK	All OK	Problems encountered	Operation
	Check that the diesel leaks from the injector recirculation connections are small (seepage) and roughly equal to one another. See Test 1060OC INJECTOR SEAL TEST	Move on to Step 3	Significant leak from one injector	Replace the injector Op. 1060F11 INJECTOR ONE R R
3	HIGH PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the diesel pressure parameter is correct. See Test 1060OD HIGH PRESSURE FUEL CIRCUIT CHECK	Move on to Step 9	Pressure not correct	Move on to Step 5
4	LOW RETURN PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the pressure in the return pipe to the tank is correct. See Test 1060OA LOW FUEL RETURN PRESSURE CIRCUIT CHECK	Move on to Step 5	Pressure above the maximum limit: return pipe to the tank obstructed	Repair the pipe; if necessary, replace it
5	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the diesel fuel pressure between the filter and presssure pump is correct. See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK	Move on to Step 6	Pressure below the minimum limit or above the maximum limit	Move on to Step 8
6	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the difference in pressure upstream and downstream of the filter is less than 1 bar. See Test	Move on to Step 7	Difference in pressure more than 1 bar	Replace the fuel filter cartridge Op. 1044B20
7	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Measure the difference in pressure between the electric pump outlet and the filter inlet and check that it is less than 0.3 bar	Move on to Step 8	Difference in pressure more than 0.3 bar	Replace the pipe
8	LOW PRESSURE ELECTRIC PUMP CHECK	All OK	Problems encountered	Operation
	Check that the supply voltage for the pump is correct Check that the current absorption for the pump is correct	Move on to Step 9	1. Supply voltage not correct 2. Current greater than 10 A: pump defective 3. Current less than 2 A: pump obstructed	1. Renew electrical wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT 2. Replace the fuel pump Op. 3. Replace the fuel pump Op. and clean the fuel tank
9	CORRECT OPERATION CHECK	All OK	Problems encountered	Operation
	Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R if the previous checks have not yielded results, check that the fault is no longer present	End of diagnosis

‹ Prev The engine accelerates without pressing the accelerator pedal Next › Engine cuts out whilst running (then does not restart)

Parts & tools for this job For 2007 Fiat 500

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