22 · Diagnostics

Engine idle irregular

Make: Fiat
Model: Ulysse Factory Service Manual
Year: 2002–2010
Section: Engine › Engine idle irregular

‹ Prev Engine does not produce best performance Next › Engine cuts out whilst driving

Fault diagnosisEngine idle irregular

ENGINE IDLE IRREGULAR

2.0 16V JTD, 2.2 16V JTD

The engine idles irregularly. In particular, it does not maintain a constant, regular level with changing load (e.g. appliance activation)

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check: condition of the air intake circuit; condition of the air filter and correct operation	Move on to Step	1. Fault in the air intake circuit	1. Renew the air intake circuit
		Move on to Step	2. Air filter blocked	2. Replace the filter element Op. 1048A14 AIR CLEANER FILTERING ELEMENT - REPLACE.
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check: no errors in control unit parameter plausibility carry out the active diagnosis of the E.G.R. solenoid valve	Move on to Step	1. Error detected in the control unit	1. Continue following the instructions for the diagnostic equipment
			2. Parameters not plausible	2. Continue following the instructions for the diagnostic equipment
			3. No communication with the control unit	3. Restore the connection between the engine management control unit and the diagnostic connector See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
			4. Solenoid valve not working	Check wiring continuity < R1 > replace solenoid if necessary See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
2	FUEL FILTER CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check fuel filter operation	Move on to Step	Water, petrol, paraffin or dirt found to be present	Clean the tank and pipes and replace the diesel filter cartridge Op. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE
3	CYLINDER COMPRESSION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Carry out the cylinder compression check	Move on to Step	Cylinder compression insufficient	Move on to Step
4	CHECK THE CAUSE OF THE INSUFFICIENT COMPRESSION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	R.R. the head to check the valve seal and check the condition of the cylinders/piston rings	Move on to Step	Valve seal insufficient	Overhaul the cylinder head
5	CHECK THE CAUSE OF THE INSUFFICIENT COMPRESSION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	R.R. the head to check the valve seal and check the condition of the cylinders/piston rings	Move on to Step	Valve seal insufficient	Overhaul the cylinder head
6	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present		Fault persists control unit defective	Replace the engine management control unit Op. 1060G80 DS ELECTRIC INJECTION CONTROL UNIT - R R

‹ Prev Engine does not produce best performance Next › Engine cuts out whilst driving

Parts & tools for this job Staging For 2002 Fiat Ulysse

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