199002956 - D005 ENGINE DOES NOT PRODUCE BEST PERFORMANCE

		Test results
0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
	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	Eliminate the problem, if necessary, replace the filter element    Op. 1048A14 AIR CLEANER FILTER ELEMENT - REPLACE.
			Pipe obstructed	Restore the operation of the exhaust pipes
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 faults in the engine management control unit;- parameter plausibility	Move on to Step 2	Error detected in the control unit	Continue following the instructions on the diagnostic equipment
			Parameter not consistent	Continue following the instructions on the diagnostic equipment
2	ROAD TEST USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	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 3	The sudden onset of another error is detected	Continue following the instructions on the diagnostic equipment
			Parameters not consistent	Continue following the instructions on the diagnostic equipment
3	FUEL PRESSURE ROAD TEST	All OK	Problems encountered	Operation
	Carry out a road test and check the fuel supply pressure    Op. 0510C10 FUEL SYSTEM - CHECK DELIVERY PRESSURE under the conditions in which the fault occurs	Move on to Step 4	Fuel pressure too low: pipes obstructed	Eliminate the constrictions
			Fuel pressure too low: pump defective	Replace the pump assembly    Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
4	TIMING CHECK	All OK	Problems encountered	Operation
	Check that the timing system timing is correct    Op. 0510A20 TIMING GEAR WITH BELT DRIVE - CHECK - CARRY OUT OPERATION WITH TAPPET COVER(S) REMOVED AND TAPPETS ADJUSTED AND CRANKSHAFT PULLEY DETACHED (IF NECESSARY)	Move on to Step 5	Timing system timing not correct	Restore the correct timing system timing
5	CYLINDER COMPRESSION CHECK	All OK	Problems encountered	Operation
	Carry out the cylinder compression check    Op. 0510A10 CYLINDER COMPRESSION - CHECK FOR LOOSE SPARK PLUGS OR INJECTORS	Move on to Step 7	Cylinder compression insufficient	Move on to Step 6
6	CHECK ON CAUSE OF INSUFFICIENT COMPRESSION	All OK	Problems encountered	Operation
	R.R. the head to check the valve seal. Check the condition of the cylinders/piston rings	Move on to Step 7	Valve seal insufficient	Overhaul the head
			Cylinders/piston rings worn	Restore the seal
7	CORRECT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists: control unit defective	Replace the control unit    Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R