D10 ENGINE IDLE IRREGULAR - Fiat - IDEA - eLearn

2398745 - 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)

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check: the condition of the air intake circuit condition and correct operation of the air filter	Continue to Step 1	Air intake circuit ducts blocked	Repair the air intake circuit
		Continue to Step 1	Air filter blocked	Replace the filter element Op. 1048A14
1	CHECK 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 errors in the control unit plausibility of all the parameters Carry out: electrical E.G.R. valve fault diagnosis injectors active diagnosis Check the EGR is operating correctly, in particular that the EGR is not stuck open	Continue to Step 2	Presence of one of the following errors: P0101, P1102	Continue to Step 4
			EGR faulty	Check the continuity of the wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT and replace the EGR valve if necessary Op. 1080C10
			EGR valve blocked open	Restore correct operation of EGR system
			Injector faulty (incorrect atomization)	Check the injector wiring and, if necessary, replace the damaged injector Op. 1060F10
			Presence of other errors in the control unit	Continue following the instructions for the diagnostic equipment
2	CHECK ON FUEL FILTER	All OK	Problems met	Operation
	Check the operation of the fuel filter	Continue to Step 3	Presence of water, petrol, paraffin or dirt detected	Clean the tank and pipes and replace the diesel filter cartridge Op. 1044B20
3	CHECK FUEL PUMP	All OK	Problems met	Operation
	Use an Examiner to check fuel pump power uptake is correct by performing the test See Test 1040AA Check supply voltage' and absorption current'	Continue to Step 4	Pump defective	Replace the pump Op. 1040A70
4	CHECK FLOW METER	All OK	Problems met	Operation
	Use an Examiner to check fuel pump power uptake is correct by performing the test See Test 1060GB Check on operation of air flow meter	Continue to Step 5	Flow meter signal too high	Replace the flow meter Op. 1060G10
5	CHECK ON INJECTORS	All OK	Problems met	Operation
	Check that the injectors are working properly by carrying out the active diagnosis using the Examiner diagnostic equipment	Continue to Step 6	Injector faulty (incorrect atomization)	Check the injector wiring and, if necessary, replace the damaged injector Op. 1060F10
6	PRESSURE REGULATOR CHECK	All OK	Problems met	Operation
	Replace the diesel pressure regulator Op. 1060E50 and check that the fault is no longer present	End of diagnosis	Fault persists	Continue to Step 7
7	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Replace the pressure pump Op. 1060E10 and check that the fault is no longer present	End of diagnosis	Fault persists	Continue to Step 8
8	CHECK ON CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test Op. 0520G15	Continue to Step 10	Cylinder compression insufficient	Continue to Step 9
9	CHECKING CAUSE OF INSUFFICIENT COMPRESSION	All OK	Problems met	Operation
	Carry out R.R. on head to check the valve seal and check the condition of the cylinders/piston rings	Continue to Step 9	Insufficient valve seal	Overhaul the cylinder head
10	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists: control unit faulty	Replace engine management control unit Op. 1060G80