312000557 - D005 ENGINE DOES NOT PRODUCE BEST PERFORMANCE

Test results
0PRELIMINARY CHECKSAll OKProblems encounteredOperation

First, check:

  • condition of the air filter;
  • the condition of the air intake circuit;
  • that there are no obstructions in the exhaust pipe
  • Check that the brakes do not offer resistance to the wheels
Move on to Step 11. Obstruction in the air intake circuit2. Air intake via the inlet manifold/throttle body3. Exhaust pipe blocked4. Wheels braked1. Eliminate the obstruction; if necessary, replace the filter element    Op. 1048A14 AIR CLEANER FILTER ELEMENT - REPLACE. 2. Restore the correct seal.3. Restore the operation of the exhaust pipe.4. Restore the correct operation of the braking system.
1CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation

Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket and check:

  • no faults in the engine management control unit;
  • parameter plausibility
End of diagnosis1. Error detected in the control unit2. Parameter not consistent1. Continue following the instructions on the diagnostic equipment2. Continue following the instructions on the diagnostic equipment
2FUEL PRESSURE TESTAll OKProblems encounteredOperation
Check the fuel supply pressure by carrying out    See Test 1056BY FUEL SYSTEM SUPPLY PRESSURE CHECKMove on to Step 31. Fuel pressure too low: pipes obstructed2. Fuel pressure too low: pump defective1. Eliminate the constrictions2. Replace the pump assembly    Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
3IGNITION SYSTEM CHECKAll OKProblems encounteredOperation
Inspect the spark plugs and check that they are working properly Check the operation of the ignition coils by carrying out the    See Test 5510CE IGNITION CONTROL SIGNAL CHECK,    See Test 5510CI IGNITION COIL OPERATION CHECKand the    See Test 5510OB IGNITION COIL RESISTANCE CHECKMove on to Step 41. Spark plugs defective2. Coil defective1. Replace spark plugs    Op. 5510D10 SPARK PLUGS - R+R2. Replace coils    Op. 5510C14 IGNITION COIL/S - R.R.
4KNOCK SENSOR CHECKAll OKProblems encounteredOperation
Check the detonation sensor is working properlyMove on to Step 51. Connection defective.2. Wiring defective.3. Detonation sensor defective.1. Restore correct connection.2. Restore the correct wiring.3. Replace the knock sensor    Op. 5510C42 DETONATION SENSOR (SINGLE) - R.R.
5AIR/TEMPERATURE PRESSURE SENSOR CHECKAll OKProblems encounteredOperation
- Check that the air pressure/temperature sensor is working properly by carrying out the    See Test 1056BU ASPIRATED AIR TEMPERATURE SENSOR OPERATION CHECK Check the continuity of the wiring between the sensor and the engine control unit    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT Move on to Step 61. Sensor defective2. Wiring broken1. Replace the sensor    Op. 1056B54 INTAKE AIR PRESSURE/TEMPERATURE SENSOR - R.R. 2. Restore the correct wiring continuity.
6INJECTOR CHECKAll OKProblems encounteredOperation
Check that the injectors are working correctlyCheck that the injector needle seal is correct by carrying out the    See Test 1056BA INJECTOR OPERATION CHECKMove on to Step 71. Injector stuck/incorrectly adjusted2. Connections not correct1. Replace the injector    Op. 1056B70 INJECTOR (ONE) - R + R WITH FUEL MANIFOLD PIPE REMOVED - INCLUDES SEAL REPLACEMNT 2. Restore the correct connections    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
7ENGINE TEMPERATURE SENSOR CHECKAll OKProblems encounteredOperation
Check that the sensor operates correctly by carrying out    See Test 1056BC ENGINE COOLANT TEMPERATURE SENSOR OPERATION CHECKMove on to Step 81. Temperature sensor defective2. Connections not correct1. Replace the sensorOp. 1056B50 2. Restore the correct connections    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
8ACCELERATOR PEDAL CHECKAll OKProblems encounteredOperation
Check that the accelerator pedal is working correctly    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT Move on to Step 91. Accelerator pedal potentiometer defective2. Connections not correct1. Replace the accelerator pedalOp. 1068A14 2. Restore the correct connections    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
9MOTORIZED THROTTLE CHECKAll OKProblems encounteredOperation
Check that the motorized throttle is working properly, carrying out    See Test 1056BW THROTTLE BODY ACTUATOR OPERATION CHECKMove on to Step 101. Motorized throttle defective2. Connections not correct1. Replace the motorized throttleOp. 1056B14 2. Restore the correct connections    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
10CYLINDER COMPRESSION CHECKAll OKProblems encounteredOperation
Carry out the cylinder compression checkOp. 0520G15 Move on to Step 12Cylinder compression insufficientMove on to Step 11
11CHECK ON CAUSE OF INSUFFICIENT COMPRESSIONAll OKProblems encounteredOperation
R.R. head    Op. 1016C11 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET ON VERSIONS WITH AIR CONDITIONING to check the valve seal.Check condition of cylinders/piston ringsMove on to Step 121. Valve seal insufficient2. Cylinders/piston rings worn1. Overhaul the headOp. 1016E20 CYLINDER HEAD (ONE), LEFT OR RIGHT, REMOVED - OVERHAUL2. Restore the correct seal.
12ENGINE CONTROL UNIT CHECKAll OKProblems encounteredOperation
Check that the engine control unit is working properlyEnd of diagnosisEngine management control unit defectiveReplace the engine management control unit    Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R