22 · Diagnostics

Excessive exhaust fumes

Make: Fiat
Model: Doblò Factory Service Manual
Year: 2000–2010
Section: Emissions › Excessive exhaust fumes

‹ Prev Black exhaust fumes Next › Excessive fuel consumption

Fault diagnosisExcessive exhaust fumes

EXCESSIVE EXHAUST FUMES

Exhaust fume levelsl highs, with dense smoke and presence of particulate.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	First check: the engine oil level the condition of the air filter	Continue to Step 1	Oil level too high	Top up engine oil level
		Continue to Step 1	Filter element dirty or damaged	Replace the filter element Op. 1048A14
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect an Examiner tester to the tester connection and check the engine conntrol node: for faults in error mode; for plausibility of all parameters in parameter mode;	Continue to Step 2	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
		Continue to Step 2	Implausible parameters	Continue following the instructions for the diagnostic equipment
2	CHECKING BLOW-BY CIRCUIT	All OK	Problems met	Operation
	Check the condition of the blow-by gas intake circuit. In particular, check that there are no obstructions in the separator (cam cover) or in the pipes	Continue to Step 3	Fault in the pipe from the intake to the separator	Restore the correct operation of the circuit: if necessary, replace the pipes
		Continue to Step 3	Fault in separator (rocker cover)	Restore the correct operation of the circuit; if necessary replace the rocker cover
3	CHECKING AIR CIRCUIT	All OK	Problems met	Operation
	Check the condition and seal of the air supply circuit	Continue to Step 4	Circuit component damaged	Replace the damaged component
4	EGR actuator check	All OK	Problems met	Operation
	Carry out active diagnosis of EGR control solenoid	Continue to Step 7	Actuator does not work	Continue to Step 5
5	EGR ELECTRICAL CIRCUIT CHECK	All OK	Problems met	Operation
	Check continuity/insulation of connections between engine control unit and EGR solenoid See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT	Continue to Step 6	Electrical connection fault	Restore connections See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
6	EGR ASSEMBLY OPERATION CHECK	All OK	Problems met	Operation
	Detach actuator from vehicle and dismantle the valve unit to check correct operation.	Continue to Step 9	Valve blocked open	Eliminate the cause of the blockage and replace the actuator if necessary
		Continue to Step 9	Valve blocked open	Replace actuator Op. 1080C26
7	CHECKING CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test	Continue to Step 9	Insufficient cylinder compression	Continue to Step 8
8	CHECKING CAUSE OF INSUFFICIENT COMPRESSION	All OK	Problems met	Operation
	Carry out R.R. on head to check the valve seal Check the condition of the cylinders/piston rings	Continue to Step 9	Insufficient valve seal	Overhaul the cylinder head Op. 1016E10
		Continue to Step 9	Wear on cylinders/piston rings outside tolerance	Restore the correct clearances
9	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

‹ Prev Black exhaust fumes Next › Excessive fuel consumption

Parts & tools for this job For 2000 Fiat Doblò

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.