D002 ENGINE NOT RUNNING SMOOTHLY / (LOSING POWER) - Fiat - NUOVA 500 - eLearn

312000555 - D002 ENGINE NOT RUNNING SMOOTHLY / (LOSING POWER)

Prolonged performance reductions occur under constant load and speed conditions

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Test results
	Check the following, in order: condition of the air intake circuit; no obstructions in the catalytic converter; no water or impurities in the diesel fuel diesel filter blocked	Move on to Step 1	1. Fault in the air intake circuit2. Obstruction in the catalytic converter3. Water in diesel fuel4. Diesel filter blocked	1. Renew the air intake circuit2. Replace the catalytic converter Op. 1080B62 CATALYTIC CONVERTER - R + R 3. Remove water from diesel fuel4. Replace the fuel filter Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE
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 errors in the control unit; parameter plausibility.	Move on to Step 3	1. Error detected in the control unit2. Parameters not plausible	1. Continue following the instructions on the diagnostic equipment2. Continue following the instructions on the diagnostic equipment
2	DIESEL PRESSURE CHECK ON RAIL	All OK	Problems encountered	Operation
	Check the high pressure diesel circuitCheck that the pressurein the rail is not fluctuating with the Examiner connected to the engine management control unitCheck pressure sensor wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Check that the pressure sensor on the rail is working properly by carrying out the See Test 1060GR FUEL PRESSURE SENSOR ON RAIL OPERATION CHECK	Move on to Step 3	1. Leaks from the high pressure circuit2. High pressure regulator on the rail defective3. Rail pressure sensor wiring defective4. Rail pressure sensor defective	1. Restore high pressure circuit seal2. Replace the pressure regulator Op. 1060G31 FUEL PRESSURE REGULATOR ON SINGLE MANIFOLD TO INJECTORS - R R 3. Restore correct wiring4. Replace the pressure sensor Op. 1060G28 FUEL PRESSURE SENSOR ON FUEL MANIFOLD TO INJECTORS - R.R
3	INJECTOR CHECK	All OK	Problems encountered	Operation
	Using the Examiner, check in active diagnosis that all the injectors are working properly. Identify any injector that may be mechanically stuck shut by carrying outSee Test Check for any leaks from the injectors See Test 1060OC INJECTOR SEAL TEST	Move on to Step 4	Poor fuel atomization/poor injection due to defective injectors	Replace the injectorsOp. 1060F10
4	EGR VALVE CHECK	All OK	Problems encountered	Operation
	Using the Examiner, check in active diganosis that the EGR solenoid valve is working properly by carrying outSee Test 1080CB E.G.R. SOLENOID FUNCTIONAL TEST	Move on to Step 5	1. EGR solenoid defective2. Wiring between solenoid and engine management control unit interrupted	1. Replace the EGR solenoid Op. 1080C82 E.G.R. - VALVE HEAT EXCHANGER ASSEMBLY - CONNECTOR PIPES - R.R. 2. Restore the correct wiring
5	BRAKE PEDAL SWITCH CHECK	All OK	Problems encountered	Operation
	Check that the brake pedal switch is working properly See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT	Move on to Step 6	1. Brake pedal does not return2. Switch stuck closed3. Wiring short-circuited	1. Eliminate the cause of the sticking2. Replace the brake pedal switch Op. 5550D10 BRAKE LIGHT SWITCH - R+R 3. Eliminate the cause of the problem See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
6	ELECTRIC PUMP CHECK	All OK	Problems encountered	Operation
	Check that the pump is working properly by carrying outSee Test 1040AA	Move on to Step 7	The electric pump is not receiving an electrical power supply because the wiring between the control relay and the pump is defective	Restore the correct wiring
7	CHECK ON CORRECT OPERATION OF FLOW METER	All OK	Problems encountered	Operation
	Check thta the flow meter is working properly and that the signal is not too high by carrying out See Test 1060GS FLOW METER OPERATION CHECKCheck the continuity of the wiring between the flow meter and the engine management control unit	Move on to Step 8	1. Flow meter defective with signal too high2. Wiring defective	1. Replace the flow meter Op. 1060G10 AIR FLOW METER - R.R. 2. Restore the correct wiring
8	CORRECT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R if the previous checks have not given results.