312000739 - D003 ENGINE NOT RUNNING SMOOTHLY / (IRREGULAR OPERATION)

Test results
0PRELIMINARY CHECKSAll OKProblems encounteredOperation

First, check:

  • the condition of the air intake circuit
  • for fuel leaks in the low pressure circuit
  • for the presence of water in the diesel
Move on to Step 11. Air intake circuit faulty, drainage pipe blocked/distorted2. Leaks from the low pressure circuit3. Traces of water in the diesel1. Replace the exhaust pipe2. Restore the correct seal.3. Replace diesel in the tank
1CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.

Check:

  • no faults in the engine management control unit;
  • no errors on the CAN line between the engine management control unit and the ABS control unit.
  • parameter plausibility
Move on to Step 2Presence of errorsContinue following the instructions on the diagnostic equipment
2CLUTCH SWITCH CHECKAll OKProblems encounteredOperation
Using the Examiner check that the clutch switch is working properly by connecting to the engine management control unitMove on to Step 31. Switch not correctly adjusted2. Switch wiring broken3. Switch defective1. Adjust the switch2. Restore wiring continuity3. Replace the switchOp. 1060D42 SWITCH ON CLUTCH PEDAL- R. R (DIESEL ENGINES)
3FUEL HIGH PRESSURE CHECKAll OKProblems encounteredOperation
Check that the high fuel pressure is correct by carrying out    See Test 1060OD HIGH PRESSURE FUEL CIRCUIT CHECKMove on to Step 5Diesel pressure not correctMove on to Step 4
4FUEL LOW PRESSURE CHECKAll OKProblems encounteredOperation
Carry out a road test, reproducing the conditions in which the fault occurs.Check that the fuel supply pressure is correct by carrying out    See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECKMove on to Step 51. Pressure not correct: obstructions in the fuel supply pipe.2. Pressure not correct: tank not sufficiently ventilated.3. Pressure not correct: electric pump defective.1. Remove the obstructions in the fuel pipe, replace it if necessary.2. Restore the tank ventilation3. Replace electric pump    Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
5ACCELERATOR PEDAL CHECKAll OKProblems encounteredOperation
Using the Examiner check that the accelerator pedal is working properly by connecting to the engine management control unit by carrying out    See Test 1068AC ACCELERATOR PEDAL CHECKSMove on to Step 61. Accelerator pedal position incorrect2. Wiring defective3. Accelerator pedal sensor defective1. Restore the seal for the pipesRestore wiring2. Replace the accelerator pedal    Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R
6FLOW METER CHECKAll OKProblems encounteredOperation

Check:

Move on to Step 71. Presence of water in the intake circuit.2. Wiring defective3. Air flow meter defective4. Flow meter supply not correct1.Eliminate the water penetration and replace the flow meter.2.Restore correct wiring.3.Replace flow meter    Op. 1060G10 AIR FLOW METER - R.R. 4.Restore correct power supply
7EGR VALVE CHECKAll OKProblems encounteredOperation
With an Examiner in active diagnosis, check the correct operation of the EGR valveCheck the wiring continuityCheck that the EGR solenoid valve supply is correct by carrying outSee Test 1080CB Move on to Step 81. Wiring between EGR valve and engine management control unit interrupted2. EGR valve defective3. Signal from engine management control unit interrupted1. Restore correct wiring2. Replace EGR solenoid    Op. 1080C82 E.G.R. - VALVE HEAT EXCHANGER ASSEMBLY - CONNECTOR PIPES - R.R. 3. Replace the engine control unit    Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R
8INJECTOR CHECKAll OKProblems encounteredOperation
Using the Examiner check that the injectors are working properly by carrying outSee Test Check the wiring continuity    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Move on to Step 91. Injectors defective2. Injector wiring defective1. Replace the injectorsOp. 1060F10 2. Restore correct wiring.
9HIGH PRESSURE PUMP CHECKAll OKProblems encounteredOperation
Check that the high pressure pump is working properly.Move on to Step 10High pressure pump defectiveReplace the high pressure pump    Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R.
10CORRECT OPERATION CHECKAll OKProblems encounteredOperation
Check that the engine control unit is working properlyEnd of diagnosisEngine management control unit defectiveReplace the engine management control unit    Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R