939003569 - D005 ENGINE DOES NOT PRODUCE BEST PERFORMANCE

The customer complains of: Reduced engine performance in all operating conditions

		Results of the tests
0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
	Check that the engine oil level is correct    Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY Check that the air intake/vacuum circuit is working properly    See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECKCheck the condition of the fuel supply circuit and make sure that it is working properly    See Test 1040OA FUEL SUPPLY CIRCUIT CHECKCheck the operation of the low pressure supply circuit    See Test 1060OB CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUIT	Move on to Step 1	Oil level incorrect	Restore the correct engine oil level    Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY
1	AMBIENT PARAMETERS CHECK	All OK	Problems encountered	Operation
	Select the following control unit at the diagnostic equipment: EDC16C39 Diesel electronic injection control unit.Check the value of the following parameters:. Battery voltage    See Test 5530BB BATTERY VOLTAGE CHECK. Accelerator pedal. Accelerator position 1 AD/C. Accelerator position 2 AD/C    See Test 1068AC ACCELERATOR PEDAL CHECKS. Atmospheric pressure    See Test 1060GD ATMOSPHERIC PRESSURE CHECK. Supercharging pressure Objective. Supercharging pressure Measured    See Test 1060GF SUPERCHARGING PRESSURE CHECK. Measured air mass    See Test 1060GG MEASURED AIR MASS CHECK. Air temperature in the intake manifold    See Test 1064BD SUPERCHARGING TEMPERATURE CHECK. Engine coolant temperature    See Test 1060OE CHECK ON OPERATION OF COOLANT TEMPERATURE SENSOR. Diesel temperature    See Test 1060EA DIESEL FUEL TEMPERATURE CHECK. Objective Diesel pressure. Measured Diesel pressure    See Test 1060GH DIESEL FUEL PRESSURE CHECK. Engine rpm    See Test 1060GI ENGINE SPEED CHECK	Move on to Step 2
2	ELECTRICAL EQUIPMENT CHECK	All OK	Problems encountered	Operation
	Check that fuse F1 has not blown (it is the last one at the bottom of the vertical row). The check on the following system is only necessary if the outside temperature is below 0 °C.	Move on to Step 3	Fuse F1 has blown	Restore the connections or, if necessary, replace the junction unit in the engine compartment    Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R.
					3	TURBOCHARGER ADJUSTMENT CHECK	All OK	Problems encountered	Operation
	Using the diagnostic equipment carry out the active diagnosis for the turbocharger regulating solenoid valve.Check the operation of the variable geometry control actuator    See Test 1064BC VARIABLE GEOMETRY TURBOCHARGER ACTUATOR SEAL TEST	Move on to Step 4	Solenoid valve not working	Restore the wiring continuity    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the solenoid valve if necessary    Op. 1064B42 SOLENOID CONTROLLING TURBOCHARGER VANE POSITION ACTUATOR - R.R
			Actuator not working properly	Check the condition of the vacuum circuit, if necessary, replace the damaged components
4	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Carry out the active diagnosis for the E.G.R. solenoid valve	Move on to Step 5	E.G.R. solenoid valve not working	Restore the wiring continuity    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the solenoid valve if necessary    Op. 1080C24 E.G.R. SYSTEM SOLENOID - R + R
5	BRAKE PEDAL SWITCH CHECK	All OK	Problems encountered	Operation
	Check that the brake pedal switch is working properly	Move on to Step 6	Brake pedal does not return	Eliminate the cause of the sticking
			Switch stuck closed	Replace the switch    Op. 1060G38 BRAKE PEDAL SWITCH - R.R
			Wiring short circuited	Restore the correct connection    See E2021 BRAKE LIGHTS - DESCRIPTION
6	TURBOCHARGER CHECK	All OK	Problems encountered	Operation
	Check    See Test 1064BA SUPRECHARGING PRESSURE CHECKthe operation of the turbocharger	Move on to Step 7	Turbocharger faulty	Replace the turbochargerSee Test 1064A10 TURBO CHARGER - R + R
7	HIGH PRESSURE CHECK	All OK	Problems encountered	Operation
	Connect the diagnotsic equipment to the diagnostic socket.Check    See Test 1060OD INSPECTION OF THE HIGH PRESSURE FUEL CIRCUITthat the diesel pressure parameter is correct	Move on to Step 15	Pressure not correct	Move on to Step 8
8	LOW RETURN PRESSURE CHECK	All OK	Problems encountered	Operation
	Check    See Test 1060OA CHECK ON RETURN LOW PRESSURE FUEL CIRCUITthat the pressure in the return pipe to the tank is less than 1 bar	Move on to Step 9	Pressure above the maximum limit: return pipe to the tank obstructed	Repair the pipe and replace if necessary.
9	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check    See Test 1060OB CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUITthat the diesel pressure between the filter and the pressure pump is between 2 and 3 bar	Move on to Step 15	Pressure below the minimum limit or above the maximum value	Move on to Step 10
10	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Constrict the return pipe from the pressure relief valve and carry out the test again    See Test 1060OB CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUITwith the pipe constricted, checking that the filter outlet pressure remains below 2 bar	Move on to Step 11	Pressure rises to 5 bar: pressure regulator valve on filter mounting incorrectly adjusted	Replace the valveSee Test 1044B16
11	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the difference in pressure upstream and downstream of the filter is less than 1 bar	Move on to Step 12	Difference in pressure more than 1 bar	Replace the fuel filter cartridgeOp. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE
12	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the supply pump pressure at the filter inlet is more than 2.2 bar	Move on to Step 15	Pressure below 2 bar	Move on to Step 13
13	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Measure the difference in pressure between the electrical pump outlet and the filter inlet checking that it is less than 0.3 bar	Move on to Step 14	Difference in pressure more than 0.3 bar	Replace the pipe
14	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check    See Test 1040AA SUPPLY VOLTAGE AND ABSORPTION CURRENT CHECKS that the pump supply voltage is equal to 12V and that the current uptake is between 2 and 10 A	Move on to Step 15	Voltage lower than 12 V	Check electrical wiring    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
			Current greater than 10 A: pump defective	Replace the fuel pump    Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
			Current less than 2 A: pump obstructed	Replace the fuel pump    Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R and clean the fuel tank
15	CHECK CORRECT OPERATION	All OK	Problems encountered	Operation
	Replace the high pressure DRV valve    Op. 1060E50 PRESSURE REGULATOR ON PRESSURE PUMP - R.R. and check that the fault is no longer present	End of diagnosis	Fault persists	Move on to Step 16
16	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Replace the high pressure pump    Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R. and check that the fault is no longer present	End of diagnosis	Fault persists	Move on to Step 17
17	TIMING CHECK	All OK	Problems encountered	Ope

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