22 · Diagnostics

Engine knocking

Make: Fiat
Model: Grande Punto Factory Service Manual
Year: 2005–2012
Section: Noise / vibrations › Engine knocking

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Fault diagnosisEngine knocking

ENGINE KNOCKING

1.9 Multijet

The customer complains of: Irregular combustion noise, engine knock

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 carrying out the See Test 1040OA FUEL SUPPLY CIRCUIT CHECK Check the operation of the low pressure supply circuit by carrying out the See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK	Move on to Step 1	Oil level incorrect	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: Diesel 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 . Atmospheric pressure See Test 1060GD ATMOSPHERIC PRESSURE CHECK . Supercharging pressure Target . Supercharging pressure Measured See Test 1060GF SUPERCHARGING PRESSURE CHECK . Measured air mass See Test 1060GG CHECK MEASURED AIR MASS . Engine coolant temperature See Test 1060OE ENGINE COOLANT TEMPERATURE SENSOR OPERATION CHECK . Diesel temperature See Test 1060EA DIESEL TEMPERATURE CHECK . Objective 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	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.	End of diagnosis	The result of the active diagnosis is negative	Move on to Step 3
3	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

1.3 Multijet

The customer complains of: Irregular combustion noise, engine cylinder head knock

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: - Coolant temperature See Test 1060OE ENGINE COOLANT TEMPERATURE SENSOR OPERATION CHECK . Atmospheric pressure See Test 1060GD ATMOSPHERIC PRESSURE CHECK	Move on to Step 2
2	Intake circuit check	All OK	Problems encountered	Operation
	Check that the air intake/vacuum circuit is working properly by carrying out the See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECK	Move on to Step 3
3	Preheating relay active diagnosis	All OK	Problems encountered	Operation
	Carry out the active diagnosis of the preheating relay, checking that the result is positive	Move on to Step 5	The result of the active diagnosis is negative	Move on to Step 4
4	Check on operation of heater plugs	All OK	Problems encountered	Operation
	Check that the heater plugs are working properly, by carrying out the See Test 5520CA CHECK GLOW PLUG OPERATION	Move on to Step 5
5	Feed circuit check	All OK	Problems encountered	Operation
	Check the condition of the fuel supply circuit and make sure that it is working properly carrying out the See Test 1040OA FUEL SUPPLY CIRCUIT CHECK	Move on to Step 6
6	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: - Press. Diesel measured See Test 1060GH DIESEL PRESSURE CHECK - Pressure regulator opening (MPROP) See Test 1060GR CHECK OPERATION OF FUEL PRESSURE SENSOR ON RAIL	End of diagnosis

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Parts & tools for this job For 2005 Fiat Grande Punto

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