D10 ENGINE IDLE IRREGULAR - Fiat - MULTIPLA - eLearn

2888337 - D10 ENGINE IDLE IRREGULAR

The engine is not running smoothly when idling; in particular, it does not maintain a constant, regular value as the load varies (e.g. when electrical devices are switched on, etc.).

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: the state of the spark plugs and leads condition of air filter the condition of the air intake circuit	Continue to Step 1	Spark plugs dirty or damaged	Clean or replace the spark plugs Op. 5510D10
			Spark plug leads damaged	Replace the spark plug leads Op. 5510D14
			Filter element dirty or damaged	Replace the filter element Op. 1048A14
			Air intake circuit component damaged	Replace the component (see Assembly 1048A)
1	CHECKING 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 engine management control unit the 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
		Continue to Step 2	Lack of dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
2	IDLE CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other iinstruments) carry out active diagnosis on the idle actuator	Continue to Step 3	Idle actuator connection defective	Restore connection between idle actuator and control unit, See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
		Continue to Step 3	Idle actuator defective	Replace the idle actuator Op. 1056B56
3	CHECKING LAMBDA SENSOR	All OK	Problems met	Operation
	Check that the Lambda sensor is working properly	Continue to Step 4	Lambda sensor not working properly	Replace the Lambda sensor Op. 1080B60
4	VAPOUR RECOVERY SYSTEM CHECK	All OK	Problems met	Operation
	Check the condition and the seal of the vapour recovery pipes	Continue to Step 5	Pipes obstructed or have extremely small holes	Restore the vapour recovery pipes and replace if necessary (see Assembly 1080E)
5	CHECK VACUUM PIPE	All OK	Problems met	Operation
	Check condition and fitting of vacuum pipe	Continue to Step 6	Pipe fitted incorrectly or bent	Refit correctly
	Check condition and fitting of vacuum pipe	Continue to Step 6	Pipe damaged	Replace the vacuum pipe Op. 3330D24
6	CHECK ON FUEL PRESSURE	All OK	Problems met	Operation
	Check the fuel supply pressure Op. 0510C10	Continue to Step 7	Pressure not correct	Replace the fuel pump assembly Op. 1040A70
7	CHECK ON TIMING	All OK	Problems met	Operation
	Check that the engine timing is correct	Continue to Step 8	Timing not correct	Restore the correct engine timing Op. 1032B14
8	CHECK ON CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test Op. 0510A10	Continue to Step 9	Compression values not correct	Restore the correct cylinder compression, e.g by checking the injector seal Op. 1056B70
9	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists