22 · Diagnostics

Black exhaust fumes

Make: Fiat
Model: Croma Factory Service Manual
Year: 2005–2010
Section: Emissions › Black exhaust fumes

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Fault diagnosisBlack exhaust fumes

BLACK EXHAUST FUMES

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

The customer complains of: Excessive black/grey fumes

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 CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUIT	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: EDC16C39 Diesel electronic injection control unit. Check the value of the following parameters: . Battery voltage See Test 5530BB BATTERY VOLTAGE CHECK . Engine coolant temperature See Test 1060OE CHECK ON OPERATION OF COOLANT TEMPERATURE SENSOR . Diesel temperature See Test 1060EA DIESEL FUEL TEMPERATURE CHECK . Engine rpm See Test 1060GI ENGINE SPEED CHECK	Move on to Step 2
2	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 4	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 4	Fuse F20 has blown	Move on to Step 3
3	DIESEL PREHEATING FUSE CHECK	All OK	Problems encountered	Operation
	Check the circuit for the protective fuse for the diesel preheating relay, conduct See Test 5505AB CHECK DIESEL PREHEATING RELAY PROTECTIVE FUSE	Move on to Step 4
4	DIESEL PREHEATING RELAY CHECK	All OK	Problems encountered	Operation
	Check the diesel preheating relay circuit, conduct See Test 5505AC CHECK DIESEL PREHEATING RELAY	End of diagnosis

1.8, 2.2

A high level of dark coloured exhaust fumes is noted

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Test results
	Check whether the problem is associated with oil consumption	Move on to Step 1	Excessive oil consumption	See table See table X05 EXCESSIVE OIL CONSUMPTION
1	AIR CIRCUIT CHECK	All OK	Problems encountered	Operation
	Check: The state of the air filter; The condition and seal of the air supply circuit	Move on to Step 2	Circuit component damaged	Replace the defective component
		Move on to Step 2	Filter element dirty or damaged	Replace the filter element
2	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic test equipment (Examiner or other instruments) to the tester input. Check that there are no faults in the engine management control unit.	Move on to Step 3	"Fuel system" error detected	See table Z50 ERRORE TITOLO MISCELA
			"Upstream Lambda sensor" error detected	See table Z56 ERRORE SEGNALE LAMBDA A MONTE
			"Downstream Lambda sensor" error detected	See table Z58 ERRORE SEGNALE LAMBDA A VALLE
			Another error detected in the control unit	Continue following the instructions for the diagnostic equipment
			No communication with the control unit	Restore the connection between the engine management control unit and the diagnostic connector See See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
3	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment (Examiner or other instruments) and carry out the active diagnosis for the injectors.	Move on to Step 4	Injector connection faulty	Restore the connection for the injectors with the control unit See See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
		Move on to Step 4	Injectors faulty	Replace the injectors Op. Op. 1056B70 INJECTOR (ONE) - R + R WITH FUEL MANIFOLD PIPE REMOVED - INCLUDES SEAL REPLACEMNT
4	FUEL PRESSURE CHECK	All OK	Problems encountered	Operation
	Check the fuel supply pressure Op. Op. 0510C10 FUEL SYSTEM - CHECK DELIVERY PRESSURE	Move on to Step 5	Pressure not correct	Replace the fuel pump assembly
5	CHECK CORRECT OPERATION	All OK	Problems encountered	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom

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Parts & tools for this job For 2005 Fiat Croma

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