16 · Diagnostics

W05 White smoke at exhaust

Make: Alfa Romeo
Model: 156 Factory Service Manual
Year: 1997–2002
Section: Emissions › W05 White smoke at exhaust

‹ Prev W02 Low co, high nox emission (1.6 TS/1.8 TS/2.0 TS/2.5 V6 Euro3)Next › W05 White smoke at exhaust (1.9 JTD/2.4 JTD Euro3)

Fault diagnosisW05 White smoke at exhaust

W05 White smoke at exhaust

There is a large amount of exhaust fumes, with light coloured smoke

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS First check that there is no water or other fluids in the fuel tank	OK	Move onto step 1
0		Presence of dirt in the fuel tank	Clean the fuel tank Op. 1040A10 End of diagnosis
1	CHECKING WITH DIAGNOSTIC EQUIPMENT Connect diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Check that there are no faults in the engine management control unit	OK	Move onto step 2
		An error is detected in the control unit	Continue following the instructions for the diagnostic equipment End of diagnosis
		Lack of dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector Wiring diagram E5030 PETROL ENGINES ELECTRONIC CONTROL End of diagnosis
1	CHECKING WITH DIAGNOSTIC EQUIPMENT Connect diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Check that there are no faults in the engine management control unit	OK	Move onto step 2
		An error is detected in the control unit	Continue following the instructions for the diagnostic equipment End of diagnosis
		Lack of dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector Wiring diagram E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT End of diagnosis
2	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the injectors	OK	Move onto step 3
		Injector connections faulty	Restore the connection of the injectors with the control unit, Wiring diagram E5030 PETROL ENGINES ELECTRONIC CONTROL End of diagnosis
		Injectors faulty	Replace injectors Op. 1056B70 End of diagnosis
2	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the injectors	OK	Move onto step 3
		Injector connections faulty	Restore the connection of the injectors with the control unit, Wiring diagram E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT End of diagnosis
		Injectors faulty	Replace injectors Op. 1060F10 End of diagnosis
3	CHECKING CYLINDER HEAD GASKET Verify: that the cylinder head tightening is correct the gasket seal	OK	Move onto step 4
		Cylinder head tightening not correct	Restore correct tightening End of diagnosis
		Gasket damaged	Replace the gasket Op. 1016C11 End of diagnosis
3	CHECKING CYLINDER HEAD GASKET Verify: that the cylinder head tightening is correct that the gasket is not leaking	OK	Move onto step 4
		Cylinder head tightening not correct	Restore correct tightening End of diagnosis
		Gasket damaged	Replace the gasket Op. 1016D11 End of diagnosis
4	CHECKING BLOW-BY CIRCUIT Check the condition of the blow-by gas intake circuit. In particular, check that there are no obstructions in the separator or in the pipes	OK	Move onto step 5
		Blow-by circuit faulty	Restore the operation of the circuit; if necessary, replace the pipes (see Assembly 1080D) End of diagnosis
		Fault in the separator	Replace the separator Op. 1080D34 End of diagnosis
5	CHECK ON CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
5		Fault persists	Incorrect selection of diagnostic procedure

‹ Prev W02 Low co, high nox emission (1.6 TS/1.8 TS/2.0 TS/2.5 V6 Euro3)Next › W05 White smoke at exhaust (1.9 JTD/2.4 JTD Euro3)

Parts & tools for this job For 1997 Alfa Romeo 156

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