72409 - D05 ENGINE DOES NOT ACHIEVE MAXIMUM PERFORMANCE

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	First, check: the condition of the air filter; the condition of the air intake circuit; that there are no obstructions in the exhaust pipe	Move on to Step	1. Air intake circuit faulty	1. Eliminate the problem, if necessary, replace the filter element    See in Op. 1048A14 air cleaner filtering element - replace.
			2. Pipe obstructed	2. Restore the operation of the exhaust pipes
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check: that there are no faults in the engine management control unit; parameter plausibility	Move on to Step	1. "Fuel system" error detected	1. Continue following the instructions in Table Z050
			2. Another error detected in the control unit	2. Continue following the instructions for the diagnostic equipment
			3. Parameter not consistent	3. Continue following the instructions for the diagnostic equipment
2	ROAD TEST USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Carry out a road test keeping the diagnostic equipment connected.Check: that there are no faults in the engine management control unit; parameter plausibility	Move on to Step	1. "Fuel system" error detected	1. Continue following the instructions in Table Z050
			2. The sudden onset of another error is detected	2. Continue following the instructions for the diagnostic equipment
			3. Parameters not consistent	3. Continue following the instructions for the diagnostic equipment
3	FUEL PRESSURE ROAD TEST	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 20 V,2.0 TB	Carry out a road test and check the fuel supply pressure in the conditions in which the problem occurs    See in Op. 0510C10 FUEL SYSTEM - Check DELIVERY PRESSURE	Move on to Step	1. Fuel pressure too low: pipes obstructed	1. Eliminate the constrictions
			2. Fuel pressure too low: pump defective	2. Replace the pump assembly    See in Op. 1040A70 SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R.
3	FUEL PRESSURE ROAD TEST	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Carry out a road test and check the fuel supply pressure in the conditions in which the problem occurs    See in Op. 0510C10 FUEL SYSTEM - Check DELIVERY PRESSURE	Move on to Step	1. Fuel pressure too low: pipes obstructed	1. Eliminate the constrictions
			2. Fuel pressure too low: pump defective	2. Replace the pump assembly    See in Op. 1040A70 SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R.
4	MODULAR MANIFOLD SOLENOID VALVE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 20 V,2.0 TB	Carry out the active diagnosis of the modular manifold solenoid valve	Move on to Step	Solenoid valve not working	Move on to Step
5	MODULAR MANIFOLD SOLENOID VALVE CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 20 V,2.0 TB	Check the supply and earth for the modular manifold solenoid valve (Wiring Diagram ) E5030 PETROL ENGINE ELECTRONIC MANAGEMENT	Move on to Step	1. Solenoid valve faulty	1. Replace the solenoid valve
			2. Connections not correct	2. Renew the connections (Wiring Diagram ) E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
6	MODULAR MANIFOLD CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 20 V,2.0 TB	Check that the modular manifold is working properly	Move on to Step	1. Pneumatic actuator not working	1. Restore the correct connection. If necessary, replace the actuator (Wiring Diagram ) E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
			2. Manifold not working	2. Replace the manifold
7	PHASE TRANSFORMER SOLENOID VALVE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 20 V,2.0 TB	Carry out the active diagnosis of the phase transformer solenoid valve	Move on to Step	Solenoid valve not working	Move on to Step
8	PHASE TRANSFORMER ELECTRICAL CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 20 V,2.0 TB	Check the supply and earth for the phase transformer solenoid valve (Wiring Diagram ) E5030 PETROL ENGINE ELECTRONIC MANAGEMENT	Move on to Step	1. Phase transformer faulty	1. Replace the phase transformer
			2. Connections not correct	2. Renew the connections (Wiring Diagram ) E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
9	PHASE TRANSFORMER CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 20 V,2.0 TB	Check the operation of the phase transformer supplying the phase transformer solenoid avlve directly whilst idlingThe engine speed should vary considerably (very irregular idling)	Move on to Step	There are no speed variations: phase transformer stuck	Replace the phase transformer
10	TIMING CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the valve gear timing is correct	Move on to Step	Valve gear timing not correct	Restore the correct valve gear timing
11	CYLINDER COMPRESSION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Carry out the cylinder compression check    See in Op. 0510A10 CYLINDER COMPRESSION - Check with spark plugs or injectors removed	Move on to Step	Cylinder compression insufficient	Move on to Step
12	CHECK ON CAUSE OF INSUFFICIENT COMPRESSION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	R/R head for valve leakage test Check condition of cylinders/piston rings	Move on to Step	1. Valve seal insufficient	1. Overhaul the head
			2. Cylinders/piston rings worn	2. Restore the seal
13	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present		Fault persists control unit defective	Replace the control unit    See in Op. 1056B82 Injection/ignition system CONTROL UNIT (one) - R.R.