23 · Diagnostics

Engine not running smoothly

Make: Fiat
Model: Panda Factory Service Manual
Year: 2003–2012
Section: Engine › Engine not running smoothly

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Fault diagnosisEngine not running smoothly

ENGINE NOT RUNNING SMOOTHLY

1.3 JTD 16v

There are decreases in performance during acceleration

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check, in order: the condition of the air intake circuit that there are no faults in the air filter whether the diesel pipes are leaking the accelerator pedal travel that there is no water, petrol, paraffin or dirt in the fuel tank and filter that there no obstructions in the exhaust system	Continue to Step 1	Intake air circuit ducts obstructed	Repair the air intake circuit
			Leaks from intake ducts after the compressor	Repair the leak
			Air filter blocked	Replace the filter element
			Leak from diesel pipes	Eliminate the leaks
			Accelerator pedal travel incomplete	Eliminate the cause of the problem
			Presence of water, petrol, paraffin or dirt detected	Clean the tank and pipes and replace the filter element
			Obstruction in the exhaust system	Replace the damaged system component
1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket Check: for errors in control unit;	Continue to Step 2	Presence of error P0093	Continue to Step 2
			Presence of one of the following errors: P0262, P0265, P0268, P0271	Continue to Step 3
			Presence of error P0504	Continue to Step 4
			Presence of error P1237 or P0400	Continue to Step 6
			Presence of one of the following errors: P0101, P1102	Continue to Step 7
			Presence of one of the following errors: P0120, P0220, P0226	Continue to Step 8
			Presence of other errors	Continue according to the instructions for the diagnostic equipment
2	HIGH RESSURE CIRCUIT CHECK	All OK	Problems met	Operation
	With the Examiner tester connected to the tester input check: that the diesel pressure parameter is as described in the test See Test 1060D Check high pressure fuel circuit the correct operation of the pressure regulator by means of active diagnostics Check that there are no leaks in high pressure circuit	Continue to Step 4	Diesel pressure parameter incorrect	Continue to Step 3
			Pressure regulator defective	Replace the pressure regulator
			Leaks in high pressure circuit	Restore system seal
3	INJECTOR HIGH PRESSURE CHECK	All OK	Problems met	Operation
	Check, as described in the test See Test 1060C Injector high pressure fuel circuit check, that diesel leaks from the injector recirculation connections are small and about the same as one another.	Continue to Step 4	Large leak from one injector	Replace the injector
4	BRAKE SWITCH CHECK	All OK	Problems met	Operation
	With the Examiner connected to the diagnostic socket, check that the brake switch is working properly	Continue to Step 5	Faulty switch	Replace switch
		Continue to Step 5	Faulty wiring	Renew the wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
5	CHECK FUEL PUMP	All OK	Problems met	Operation
	Use an Examiner to check fuel pump power uptake is correct by performing the test See Test 1040AA Check supply voltage and absorption current	Continue to Step 6	Absorption not correct	Replace the pump
6	CHECK EGR	All OK	Problems met	Operation
	With an Examiner connected to the tester output, perform: active testing of the electric EGR valve Check the condition of the EGR system, particularly to ensure that the EGR is not blocked open	Continue to Step 7	EGR wiring broken	Restore correct operation See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
			EGR valve fault	Replace EGR Op. 1080C74
			EGR system mechanical fault	Restore correct operation
7	CHECK FLOW METER	All OK	Problems met	Operation
	Check that the flow meter is working properly by carrying out the test See Test 1060GB Check on operation of air flow meter	Continue to Step 8	Flow meter signal too high with consequent increased exhaust gas recirculation	Replace the flow meter
8	CHECK ACCELERATOR PEDAL POTENTIOMETER	All OK	Problems met	Operation
	Check the correct operation of the accelerator pedal potentiometer as described in the test See Test 1068AB Check operation of accelerator pedal potentiometer	Continue to Step 9	Anomalous potentiometer operation	Replace potentiometer
		Continue to Step 9	Electrical wiring defective	Renew the wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
9	CHECK ON TURBOCHARGER	All OK	Problems met	Operation
	Check the operation of the turbocharger as described in the Test See Test 1064BA Check turbo presure	Continue to Step 11	Turbocharger faulty	Replace the turbocharger unit
10	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists: control unit faulty	Replace control unit Op. 1060G80

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