D005 ENGINE DOES NOT PRODUCE BEST PERFORMANCE - Fiat - NUOVA 500 - eLearn

312000557 - D005 ENGINE DOES NOT PRODUCE BEST PERFORMANCE

The customer complains of: Poor engine performance

0	Preliminary checks	All OK	Problems encountered	Operation
		Test results
	Check that the air intake/vacuum circuit is working properly.Check for leaks from the inlet ducts after the compressor.Check for any fuel leaks from the pipes	Move on to Step 1	1. Leaks from the air intake circuit2. Fuel leaks from the pipes	1. Restore the seal on the air intake system.2. Restore the seal for the pipes
1	Checks using diagnostic equipment	All OK	Problems encountered	Operation
	Check that there are no errors by connecting to the engine management control unit using the Examiner	Move on to Step 2	Presence of errors	Continue as instructed by the diagnostic equipment.
2	Timing sensor check	All OK	Problems encountered	Operation
	Check correct operation of the timing sensor by carrying out See Test 1060GC TIMING SENSOR OPERATION CHECK	Move on to Step 3	Timing sensor not working	Replace the timing sensor Op. 1060G22 CAM ANGLE SENSOR - R.R
3	Accelerator pedal check	All OK	Problems encountered	Operation
	Check by connecting to the engine management control unit using the Examiner that the accelerator pedal sensor is working properly by carrying out See Test 1068AC ACCELERATOR PEDAL CHECKS	Move on to Step 4	Sensor defective	Replace the accelerator pedal Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R
4	EGR valve check	All OK	Problems encountered	Operation
	Check that the EGR valve is not stuck open by carrying outSee Test 1080CB	Move on to Step 5	Valve stuck open	Replace EGR valve Op. 1080C82 E.G.R. - VALVE HEAT EXCHANGER ASSEMBLY - CONNECTOR PIPES - R.R.
5	Turbocharger adjustment check	All OK	Problems encountered	Operation
	Using the Examiner carry out the active diagnosis for the turbocharger regulating valve.Check the operation of the turbo pressure control valve See Test 1064BB TURBOCHARGING PRESSURE SOLENOID (PIERBURG) VALVE OPERATION CHECKCheck the maximum turbocharger supercharging pressure by carrying out See Test 1064BA TURBOCHARGING PRESSURE CHECK	Move on to Step 6	1. Solenoid not working2. Fuse blown3. Turbine control actuator not working properly4. Vacuum circuit defective	1. Restore the wiring continuity See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the solenoid if necessaryOp. 1064B42 SOLENOID CONTROLLING TURBOCHARGER VANE POSITION ACTUATOR - R.R2. Replace the fuse after having identified what caused it to blow3. Change the turbocharger Op. 1064A11 TURBOCHARGER WITH CATALYTIC CONVERTER - R.R. 4. Restore the vacuum circuit
6	Check brake pedal switch	All OK	Problems encountered	Operation
	Check that the brake pedal switch is working properly.	Move on to Step 7	1. Brake pedal does not return2. Switch stuck closed3. Wiring short circuited	Eliminate the cause of the stickingReplace the switch Op. 5550D10 BRAKE LIGHT SWITCH - R+R Restore correct insulation See E2021 BRAKE LIGHTS
7	Injector seal check	All OK	Problems encountered	Operation
	Check that the injectors are not leaking See Test 1060OC INJECTOR SEAL TEST	Move on to Step 8	Injectors defective	Replace the injectorsOp. 1060F10
8	Flow meter check	All OK	Problems encountered	Operation
	Check that the flow meter is working properly, carrying out See Test 1060GS FLOW METER OPERATION CHECK(checking that the flow meter signal is not too low)	Move on to Step 9	Air flow meter defective	Replace the flow meter Op. 1060G10 AIR FLOW METER - R.R.
9	High pressure check	All OK	Problems encountered	Operation
	Connect an Examiner to the engine control unitCheck, as described, See Test 1060OD HIGH PRESSURE FUEL CIRCUIT CHECKthat the diesel pressure parameter is correct	Move on to Step 15	Pressure not correct	Move on to Step 10
10	Low return pressure check	All OK	Problems encountered	Operation
	Check that the pressure in the return pipe to the tank is correct See Test 1060OA LOW FUEL RETURN PRESSURE CIRCUIT CHECK	Move on to Step 11	Pressure above the maximum limit: return pipe to the tank obstructed	Repair the pipe and replace if necessary.
11	Low supply pressure check	All OK	Problems encountered	Operation
	Check, as described, See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECKthat the diesel pressure is correct	Move on to Step 12	Pressure not correct	Move on to Step 13
12	Check change in supply pressure	All OK	Problems encountered	Operation
	Check that the difference in pressure upstream and downstream of the filter is less than 1 bar by carrying outSee Test	Move on to Step 14	Difference in pressure more than 1 bar	Replace the fuel filter cartridge Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE
13	Check on operation of low pressure supply pump	All OK	Problems encountered	Operation
	Check that the pump supply voltage is correct Check that the current absorbed by the pump is correct by carrying outSee Test 1040AA	Move on to Step 15	1. Voltage lower than 12 V2. Current greater than 10 A: pump defective3. Current less than 2 A: pump obstructed	1. Check electrical wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT 2. Replace the fuel pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R 3. Replace the fuel pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R and clean the fuel tank
14	Check on correct operation of high pressure pump.	All OK	Problems encountered	Operation
	Check that the high pressure pump is working properly	End of diagnosis	High pressure pump defective	Replace the high pressure pump Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R.
15	Check on correct operation of engine management control unit	All OK	Problems encountered	Operation
	Check that the engine control unit is working properly.	End of diagnosis	Engine control unit defective	If the previous checks have not given any resultsReplace the engine control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R