198001696 - 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 for:-leaks from the manifold gasket;-leaks from the throttle body;-leaks from the cylinder head.Move on to Step 1Leaks from the manifold gasketRestore the correct gasket.
Leaks from the throttle body gasketRestore the correct gasket.
Leaks from the cylinder headEliminate the leak
1CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket and check:- that there are no errors in the engine management control unit;- parameter plausibilityMove on to Step 2Error detected in the control unitContinue following the instructions on the diagnostic equipment
Parameter not consistentContinue 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 control unit    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT Move on to Step 4Solenoid faultyReplace the solenoid valve    Op. 1080E28 ENABLEMENT SOLENOID FOR FLOW OF FUEL VAPOUR TO INLET - R+R
Connections not correctRestore the correct connections    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
4IGNITION SYSTEM CHECKAll OKProblems encounteredOperation
Inspect the spark plugs and check that they are working properlyCheck that the coils are working by carrying out    See Test 5510CI IGNITION COIL OPERATION CHECKMove on to Step 5Spark plugs defectiveReplace spark plugs    Op. 5510D10 SPARK PLUGS - R+R
Coil defectiveReplace coil    Op. 5510C14 IGNITION COIL/S - R.R.
5FUEL PRESSURE CHECKAll OKProblems encounteredOperation
Check the fuel supply pressure by performing the following:    See Test 1056BI FUEL SYSTEM RETURN PRESSURE CHECK    See Test 1056BY FUEL SYSTEM SUPPLY PRESSURE CHECKMove on to Step 6Fuel pressure too low: pipe obstructedEliminate the obstructions; if necessary, replace the pipe
Fuel pressure too low: pump defectiveReplace the pump assembly    Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
6ENGINE COOLANT 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 7Engine overheatingRestore the engine cooling system    See E5020 ENGINE COOLING
Engine temperature sensor defectiveReplace the engine temperature sensor    Op. 1056B50 ENGINE COOLANT TEMPERATURE SENSOR - R + R
7INJECTOR CHECKAll OKProblems encounteredOperation
Check that the injectors are operating correctly by carrying out    See Test 1056BA Injector operation checkMove on to Step 8Injector stuck/incorrectly adjustedReplace the injector    Op. 1056B70 INJECTOR (ONE) - R + R WITH FUEL MANIFOLD PIPE REMOVED - INCLUDES SEAL REPLACEMNT
Connections not correctRestore the correct connections    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
8ACCELERATOR PEDAL CHECKAll OKProblems encounteredOperation
Check that the accelerator pedal is working correctly.Move on to Step 9Accelerator pedal potentiometer defectiveReplace the accelerator pedal    Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R
Connections not correctRestore the correct connections    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
9MOTORIZED THROTTLE OPERATION CHECKAll 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 Check on the throttle body actuator operationMove on to Step 10Connection defectiveRestore correct connection.
Wiring defectiveRestore the correct wiring.
Motorized throttle defectiveReplace the motorized throttle    Op. 1056B14 THROTTLE CASE - R + R
10CYLINDER COMPRESSION CHECKAll OKProblems encounteredOperation
Check that the cylinder compression is not too low    Op. 0520G15 COMPRESSION TEST - CHECK WITH EXAMINER WITH SPARK PLUGS/INJECTORS REMOVEDMove 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