22 · Diagnostics

Engine idling too low

Make: Fiat
Model: Croma Factory Service Manual
Year: 2005–2010
Section: Engine › Engine idling too low

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Fault diagnosisEngine idling too low

ENGINE IDLING TOO LOW

1.9 JTD 8v, 1.9 JTD 16v, 2.4 JTD 20v

The customer complains of: Engine idle speed too low

1	AMBIENT PARAMETERS CHECK	All OK	Problems encountered	Operation
		Test results
	Select the following control unit at the diagnostic equipment: EDC16C39 Diesel electronic injection control unit. Check the value of the following parameters: . Battery voltage See Test 5530BB BATTERY VOLTAGE CHECK . Accelerator pedal . Accelerator position 1 AD/C . Accelerator position 2 AD/C See Test 1068AC ACCELERATOR PEDAL CHECKS . Engine rpm See Test 1060GI ENGINE SPEED CHECK . Target Diesel pressure . Measured Diesel pressure See Test 1060GH DIESEL FUEL PRESSURE CHECK	Move on to Step 2
2	CONFIGURATION TESTS	All OK	Problems encountered	Operation
	Select the following control unit at the diagnostic equipment: EDC16C39 Diesel electronic injection control unit. Check in the Configurations section whether the replacement of any of the following components was not followed by the subsequent configuration: . Flow meter . Fuel pressure sensor . Injector . Differential pressure sensor on the catalytic converter . Lambda sensor . Main catalytic converter with filter . Pre-catalyzer In this case, carry out the configuration checking that the outcome is positive	Move on to Step 4	The outcome of the configuration is not positive	Move on to Step 3
3	CONFIGURATION REPETITION	All OK	Problems encountered	Operation
	Repeat the configuration, check that the outcome is positive this time	Move on to Step 4	The outcome of the configuration is not positive	Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R
4	ELECTRICAL EQUIPMENT CHECK	All OK	Problems encountered	Operation
	Check that the fuses F1 (the last one at the bottom of the vertical row) and F20 (the first one on the right of the lower row) have not blown. The check on the following system is only necessary if the outside temperature is below 0 °C.	Move on to Step 6	Fuse F1 has blown	Restore the connections or, if necessary, replace the junction unit in the engine compartment Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R.
		Move on to Step 6	Fuse F20 has blown	Move on to Step 5
5	DIESEL PREHEATING FUSE CHECK	All OK	Problems encountered	Operation
	Check the circuit for the protective fuse for the diesel preheating relay, carrying out the See Test 5505AB CHECK DIESEL PREHEATING RELAY PROTECTIVE FUSE	Move on to Step 6
6	DIESEL PREHEATING RELAY CHECK	All OK	Problems encountered	Operation
	Check the diesel preheating relay circuit, carrying out the See Test 5505AC CHECK DIESEL PREHEATING RELAY	Move on to Step 7
7	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Carry out the active diagnosis for the E.G.R. solenoid valve	Move on to Step 8	Solenoid valve not working	Restore the wiring continuity See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the solenoid valve if necessary Op. 1080C24 E.G.R. SYSTEM SOLENOID - R + R
8	FUEL FILTER CHECK	All OK	Problems encountered	Operation
	Check fuel filter operation	Move on to Step 9	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
9	VALVE CLEARANCE CHECK	All OK	Problems encountered	Operation
	Check that the tappet clearance is correct Op. 1036H10 VALVE TAPPETS - CHECK AND ADJUST CLEARANCE, IF NECESSARY	Move on to Step 10	Valve clearance not correct	Adjust the tappets
10	CYLINDER COMPRESSION CHECK	All OK	Problems encountered	Operation
	Carry out the cylinder compression check Op. 0510A10 CYLINDER COMPRESSION - CHECK FOR LOOSE SPARK PLUGS OR INJECTORS	Move on to Step 12	Cylinder compression insufficient	Move on to Step 11
11	CHECK THE CAUSE OF THE INSUFFICIENT COMPRESSION	All OK	Problems encountered	Operation
	Carry out Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET to check the valve seal and check the condition of the cylinders/piston rings	Move on to Step 12	Valve seal insufficient	Overhaul the cylinder head Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
12	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R

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Parts & tools for this job For 2005 Fiat Croma

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