22 · Diagnostics

Co emissions low, nox emissions high

Make: Fiat
Model: Bravo Factory Service Manual
Year: 2007–2014
Section: Emissions › Co emissions low, nox emissions high

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Fault diagnosisCo emissions low, nox emissions high

CO EMISSIONS LOW, NOX EMISSIONS HIGH

1.4 16v, 1.4 16v TJet

The CO percentage measured is very low, whilst the NOX percentage is higher than recommended.

1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Check that there are no faults in the engine management control unit.	Move on to Step 2	Presence of faults	Continue following the instructions given by the diagnostic equipment.
		Move on to Step 2	No communication with the control unit	Restore the connection between the engine management control unit and the diagnostic connector See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
2		All OK	Problems encountered	Operation
	Connect the diagnostic equipment (Examiner or other instruments) and carry out active diagnosis of the injectors	Move on to Step 3	Connections faulty	Restore the connection between the injectors and the control unit See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
		Move on to Step 3	Injector fault	Replace the injector Op. 1056B70 INJECTOR (ONE) - R + R WITH FUEL MANIFOLD PIPE REMOVED - INCLUDES SEAL REPLACEMNT
3	UPSTREAM LAMBDA SENSOR CHECK	All OK	Problems encountered	Operation
	Check that the upstream Lambda sensor is working properly by performing See Test 1080BA Check on the operation of the upstream Lambda sensor	Move on to Step 4	Lambda sensor defective.	Replace the Lambda sensor Op. 1080B94 FRONT LAMBDA SENSOR TO WITH CATALYTIC CONVERTER - R.R
4	DOWNSTREAM LAMBDA SENSOR CHECK	All OK	Problems encountered	Operation
	Check that the downstream Lambda sensor is working properly by performing See Test 1080BD Check on the operation of the downstream Lambda sensor	Move on to Step 5	Lambda sensor defective.	Replace the Lambda sensor Op. 1080B95 REAR LAMBDA SENSOR TO CATALYTIC CONVERTER - R.R
5	AIR CIRCUIT CHECK	All OK	Problems encountered	Operation
	Check the condition of the air supply circuit.	Move on to Step 6	Circuit component damaged.	Replace the component involved.
6	BLOW-BY CIRCUIT CHECK	All OK	Problems encountered	Operation
	Check the condition of the blow-by gas intake circuit: in particular, check for obstructions in the separator or pipes.	Move on to Step 7	Circuit faulty.	Restore circuit to working order
		Move on to Step 7	Fault in the separator.	Replace the separator.
7	FUEL PRESSURE CHECK	All OK	Problems encountered	Operation
	Check the fuel supply pressure by performing Op. 0520G46 FUEL SYSTEM - CHECK SUPPLY PRESSURE USING THE EXAMINER	End of diagnosis	Pressure not correct.	Replace the fuel pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R

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Parts & tools for this job For 2007 Fiat Bravo

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