22 · Diagnostics

Engine not running smoothly

Make: Fiat
Model: Grande Punto Factory Service Manual
Year: 2005–2012
Section: Engine › Engine not running smoothly

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Fault diagnosisEngine not running smoothly

ENGINE NOT RUNNING SMOOTHLY

1.9 Multijet

The customer complains of: Irregular engine operation, loss of power that can be reproduced

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Test results
	Check that the engine oil level is correct Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY Check that the air intake/vacuum circuit is working properly by carrying out the See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECK Check the condition of the fuel supply circuit and make sure that it is working properly See Test 1040OA FUEL SUPPLY CIRCUIT CHECK Check the operation of the low pressure supply circuit See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK	Move on to Step 1	Level irrregular	Restore the correct engine oil level Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY
1	AMBIENT PARAMETERS CHECK	All OK	Problems encountered	Operation
	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 . Atmospheric pressure See Test 1060GD ATMOSPHERIC PRESSURE CHECK - Turbo pressure Target - Turbo pressure Measured See Test 1060GF SUPERCHARGING PRESSURE CHECK . Measured air mass See Test 1060GG CHECK MEASURED AIR MASS . Diesel temperature See Test 1060EA DIESEL TEMPERATURE CHECK - Target Diesel pressure - Measured Diesel pressure See Test 1060GH DIESEL PRESSURE CHECK . Engine rpm See Test 1060GI CHECK ENGINE SPEED	Move on to Step 2
2	EGR AND TURBOCHARGER REGULATION CHECK	All OK	Problems encountered	Operation
	Select the following control unit at the diagnostic equipment: Diesel electronic injection control unit EDC16C39 CF4/EOBD CAN (EP engine 1.9) Check that the system is working properly Vedere Prova 5040OB <b>VERIFICA FUNZIONAMENTO IMPIANTO CONDIZIONATORE (PRESSIONI)</b>	Move on to Step 3
3	PREHEATING RELAY ACTIVE DIAGNOSIS	All OK	Problems encountered	Operation
	Carry out the active diagnosis for the preheating relay, checking that the result is positive. The check on the following system is only necessary if the outside temperature is below 0 °C.	Move on to Step 5	The result of the active diagnosis is negative	Move on to Step 4
4	HEATER PLUGS CHECK	All OK	Problems encountered	Operation
	Check that the heater plugs are working properly See Test 5520CA CHECK GLOW PLUG OPERATION	Move on to Step 5
5	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 6	Fuse F59 has blown	Restore the connections or, if necessary, replace the junction unit in the engine compartment Op. 5505A13 CENTRALINA DI DERIVAZIONE SUPPLEMENTARE NEL VANO MOTORE - S.R.
6	DIESEL PREHEATING RELAY CHECK	All OK	Problems encountered	Operation
	Check the diesel preheating relay circuit See Test 5505AC	Move on to Step 7
7	EGR AND TURBOCHARGER REGULATION CHECK	All OK	Problems encountered	Operation
	Keep the diagnotsic equipment connected to the diagnostic socket. Carry out the active diagnosis of the EGR solenoid valve Carry out the active diagnosis for the turbocharger regulation solenoid valve Check the operation of the variable geometry control actuator	Move on to Step 8	EGR 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
		Move on to Step 8	Variable geometry control solenoid does not work	Restore the wiring continuity See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the solenoid valve if necessary Op. 1064B42 SOLENOID CONTROLLING TURBOCHARGER VANE POSITION ACTUATOR - R.R
8	TURBOCHARGER CHECK	All OK	Problems encountered	Operation
	Check the operation of the turbocharger See Test 1064BA SUPERCHARGING PRESSURE CHECK	Move on to Step 9	Turbocharger faulty	Replace the turbocharger unit Op. 1064A27 TURBOCHARGER UNIT AND EXHAUST MANIFOLD - R.R.
9	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Replace the control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R

1.3 Multijet

The customer complains of: Irregular engine operation, missing that can be reproduced

1	AMBIENT PARAMETERS CHECK	All OK	Problems encountered	Operation
		Test results
	Select the following control unit at the diagnostic equipment: Marelli Diesel Injection 6F3 EOBD CAN (EP engine 1.3 JTD). Check the value of the following parameters: - Battery voltage See Test 5530BB BATTERY VOLTAGE CHECK - Clutch pedal See Test 1060GL CHECK OPERATION OF MAIN ENGINE CONTROL UNIT RELAY - Accelerator position 1 AD/C - Accelerator position 2 AD/C See Test 1068AC ACCELERATOR PEDAL CHECKS	Move on to Step 2
2	POWER SUPPLY CIRCUIT CHECK	All OK	Problems encountered	Operation
	Check the condition of the fuel supply circuit and make sure that it is working properly See Test 1040OA FUEL SUPPLY CIRCUIT CHECK	Move on to Step 3
3	AMBIENT PARAMETERS CHECK	All OK	Problems encountered	Operation
	Select the following control unit at the diagnostic equipment: Marelli Diesel Injection 6F3 EOBD CAN (EP engine 1.3 JTD). Check the value of the following parameters: - Measured Diesel pressure See Test 1060GH DIESEL PRESSURE CHECK - Pressure regulator opening (MPROP) See Test 1060GR CHECK OPERATION OF FUEL PRESSURE SENSOR ON RAIL - Air temperature (debimeter) See Test 1060GK CHECK CONTROL UNIT SOFTWARE AND HARDWARE - Diesel temperature See Test 1060EA DIESEL TEMPERATURE CHECK - Coolant temperature See Test 1060OE ENGINE COOLANT TEMPERATURE SENSOR OPERATION CHECK . Atmospheric pressure See Test 1060GD ATMOSPHERIC PRESSURE CHECK	Move on to Step 4
4	INTAKE CIRCUIT CHECK	All OK	Problems encountered	Operation
	Check that the air intake/vacuum circuit is working properly See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECK	Move on to Step 5
5	PREHEATING RELAY ACTIVE DIAGNOSIS	All OK	Problems encountered	Operation
	Carry out the active diagnosis of the preheating relay, checking that the result is positive The check on the following system is only necessary if the outside temperature is below 0 °C.	End of diagnosis	The result of the active diagnosis is negative	Move on to Step 6
6	HEATER PLUGS CHECK	All OK	Problems encountered	Operation
	Check that the heater plugs are working properly See Test 5520CA CHECK GLOW PLUG OPERATION	End of diagnosis

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Parts & tools for this job For 2005 Fiat Grande Punto

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