22 · Diagnostics

Engine idling too low

Make: Fiat
Model: Grande Punto Factory Service Manual
Year: 2005–2012
Section: Engine › Engine idling too low

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Fault diagnosisEngine idling too low

ENGINE IDLING TOO LOW

1.9 Multijet

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: Electronic injection control unit EDC16C39 CF4/EOBD CAN (EP engine 1.9). 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 CHECK ENGINE SPEED - Target Diesel pressure - Measured Diesel pressure See Test 1060GH DIESEL PRESSURE CHECK	Move on to Step 2
2	CONFIGURATION TESTS	All OK	Problems encountered	Operation
	Select the following control unit on the diagnostic tester. Diesel electronic injection control unit EDC16C39 CF4/EOBD CAN (EP engine 1.9) 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 fuse F59 has not blown (second from the left on the second row from the bottom)	Move on to Step 5	Fuse F59 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.
5	DIESEL PREHEATING RELAY CHECK	All OK	Problems encountered	Operation
	Check the diesel preheating relay circuit See Test 5505AC	Move on to Step 6
6	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 7	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
7	FUEL FILTER CHECK	All OK	Problems encountered	Operation
	Check fuel filter operation	Move on to Step 8	Water, petrol, paraffin or dirt found to be present	Clean the tank and pipes and replace the diesel filter cartridge Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE
8	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 9	Valve clearance not correct	Adjust the tappets
9	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 11	Cylinder compression insufficient	Move on to Step 10
10	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 11	Valve seal insufficient	Overhaul the cylinder head Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
11	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

1.3 Multijet

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: Diesel Injection Marelli 6F3 EOBD CAN (EP 1.3 JTD engine). Check the value of the following parameters: - Battery voltage See Test 5530BB BATTERY VOLTAGE CHECK - Engine rpm See Test 1060GI CHECK ENGINE SPEED	Move on to Step 2
2	CONFIGURATION TEST	All OK	Problems encountered	Operation
	Select the following control unit at the diagnostic equipment: Diesel Injection Marelli 6F3 EOBD CAN (EP 1.3 JTD engine). Check in the Configurations section whether the replacement of any of the following components was not followed by the subsequent configuration: - Injector In this case, carry out the configuration checking that the outcome is positive	Move on to Step 5	The outcome of the configuration is not positive	Move on to Step 3
3	ERRORS CHECK	All OK	Problems encountered	Operation
	Check whether any of the following errors are present using the diagnostic equipment: - P1301 - U0001 - U0426 - U1700	Move on to Step 5	1. Error P1301 is present 2. Error U0001 is present 3. Error U0426 is present 4. Error U1700 is present	1. Move on to Step 4 2. Continue as indicated See table U0001 CAN line error 3. Carry out the CODE programming. If this is not possible, replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R 4. Continue as indicated See table U1700 CAN network (NCM - NBC)
4	IMA CLASSIFICATION	All OK	Problems encountered	Operation
	Carry out the IMA classification again on the diagnostic equipment in the Configurations section checking that the outcome is successful	End of diagnosis	The classification is not successful	Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R
5	FUEL SUPPLY CIRCUIT CHECK	All OK	Problems encountered	Operation
	Check the condition of the fuel supply circuit and make sure that it is working properly Op. 1040OA FUEL SUPPLY CIRCUIT CHECK	End of diagnosis

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