312000559 - D010 ENGINE IDLE IRREGULAR

The engine idle speed is not correct or the engine does not stick to the idle speed
Test results
0PRELIMINARY CHECKSAll OKProblems encounteredOperation

First, check:

  • leaks from the manifold gasket;
  • leaks from the throttle body;
  • leaks from the cylinder head.
Move on to Step 11. Leaks from the manifold gasket.2. Leaks from the throttle body gasket.3. Leaks from the cylinder head.1. Restore the correct gasket.2. Restore the correct gasket.3. Eliminate the leak
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
Move on to Step 21. 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
2PETROL VAPOUR RECOVERY SOLENOID CHECKAll OKProblems encounteredOperation
Carry out the active diagnosis of the solenoid valveMove on to Step 4Solenoid not workingMove on to Step 3
3VAPOUR SOLENOID ELECTRICAL CIRCUIT CHECKAll OKProblems encounteredOperation
Check the wiring between the valve and the engine compartment control unitCheck the wiring between the valve and the engine control unit    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT Move on to Step 41. Solenoid faulty2. Connections not correct1. Replace the solenoid valve    Op. 1080E28 ENABLEMENT SOLENOID FOR FLOW OF FUEL VAPOUR TO INLET - R+R 2. Restore the correct connections    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
4IGNITION SYSTEM CHECKAll OKProblems encounteredOperation
Inspect the spark plugs and check they are working properly Check the operation of the coils by carrying out the    See Test 5510CI IGNITION COIL OPERATION CHECK,    See Test 5510OB IGNITION COIL RESISTANCE CHECKand the    See Test 5510CE IGNITION CONTROL SIGNAL CHECKMove on to Step 51. Spark plugs defective2. Coil defective1. Replace spark plugs    Op. 5510D10 SPARK PLUGS - R+R2. Replace coil    Op. 5510C14 IGNITION COIL/S - R.R.
5FUEL PRESSURE CHECKAll OKProblems encounteredOperation
Check the fuel supply pressure by performing the    See Test 1056BY FUEL SYSTEM SUPPLY PRESSURE CHECKMove on to Step 61. Fuel pressure too low: pipe obstructed2. Fuel pressure too low: pump defective1. Eliminate the obstructions; if necessary, replace the pipe2. Replace the pump assembly    Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
6ENGINE TEMPERATURE CHECKAll OKProblems encounteredOperation
Check that the engine temperature sensor is working correctly by carrying out the    See Test 1056BC ENGINE COOLANT TEMPERATURE SENSOR OPERATION CHECKMove on to Step 71. Engine overheating2. Engine temperature sensor defective1. Restore the engine cooling system    See E5020 ENGINE COOLING 2. Replace the engine temperature sensorOp. 1056B50
7INJECTOR CHECKAll OKProblems encounteredOperation
Check the injectors are working correctly    See Test 1056BA INJECTOR OPERATION CHECKMove on to Step 81. 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. Repair the connections    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
8ACCELERATOR PEDAL CHECKAll OKProblems encounteredOperation
Check that the accelerator pedal is working correctly.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
9CHECK THE OPERATION OF THE MOTORIZED THROTTLEAll OKProblems encounteredOperation
Check the condition of the motorized throttle actuator connectionCheck the condition of the wiringCheck that the motorized throttle is working properly, carrying out    See Test 1056BW THROTTLE BODY ACTUATOR OPERATION CHECKMove on to Step 101. Connection defective2. Wiring defective3. Motorized throttle defective1. Restore correct connection.2. Restore the correct wiring.3. Replace the motorized throttleOp. 1056B14
10CYLINDER COMPRESSION CHECKAll OKProblems encounteredOperation
Check that the cylinder compression is not too lowOp. 0520G15 Move on to Step 11Compression too lowOverhaul the engine
11ENGINE CONTROL UNIT OPERATION CHECKAll OKProblems encounteredOperation
Check that the engine control unit is working properlyEnd of diagnosisControl unit defective.Replace the engine management control unit    Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R