939003571 - D010 ENGINE IDLE IRREGULAR

The engine does not run smoothly whilst idling. If this condition is serious, the engine or the vehicle may shudder. The engine idle speed may vary. Any condition may be serious enough to cause the engine to cut out.
0PRELIMINARY CHECKSAll OKProblems encounteredOperation
Check that the MIL warning light is on before starting and that it goes out once the engine has been started.Also check that no accessories have been fitted in the after-marketMove on to Step 1The MIL warning lights does not come on when the key is insertedContinue as instructed in the    See table K100 MIL WARNING LIGHT NOT WORKING (REMAINS OFF BEFORE STARTING)
The MIL warning light remains on with the engine startedContinue as instructed in the    See table K101 MIL WARNING LIGHT STAYS ON (ENGINE STARTS)
There are accessories that have been fitted in the after-marketCheck that these accessories have been fitted correctly
1CONTROL UNIT ELECTRICAL CONNECTIONS CHECKAll OKProblems encounteredOperation
Check that the electrical connections for the engine management control unit are correct    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT In particular, check that:- the earth is correctly connected- the resistance between the control unit    See M010 ENGINE MANAGEMENT ECU and the battery negative    See A001 BATTERY is less than 0.5 OhmMove on to Step 2Connection to earth incorrectRestore the correct connections
Resistance to battery negative more than 0.5 OhmRestore the correct connections
2CONTROL UNIT FASTENING CHECKAll OKProblems encounteredOperation
Check that the control unit is correctly fastened in its housing    Op. 1056F82 CONTROL UNIT SINGLE OF INJECTION IGNITION SYSTEM R R Move on to Step 3Control unit fastening incorrectRenew the correct fastening of the control unit    Op. 1056F82 CONTROL UNIT SINGLE OF INJECTION IGNITION SYSTEM R R
3AIR INTAKE CIRCUIT CHECKAll OKProblems encounteredOperation
Check there are no faults in the air intake circuit.In particular, check:- that the air filter is not blocked or fitted incorrectly- that the air intake circuit does not have any irregular constrictions, leaks or is fitted incorrectlyMove on to Step 4Air filter blockedReplace the filter element    Op. 1048A14 AIR CLEANER FILTER ELEMENT - REPLACE.
Irregular componentReplace the faulty component    Op. 1048 ENGINE AIR SUPPLY CIRCUIT
Component incorrectly positionedRefit the component correctly    Op. 1048 ENGINE AIR SUPPLY CIRCUIT
4FUEL FEED CIRCUIT CHECKAll OKProblems encounteredOperation
Check there are no faults in the fuel supply circuit by performing the    See Test 1040OA FUEL SUPPLY CIRCUIT CHECKMove on to Step 5Faults presentThe operation to solve the problem is described in the actual test
5CHECK FOR THE PRESENCE OF IMPURITIES IN THE FUELAll OKProblems encounteredOperation
Check that there are no impurities such as water, alcohol or particles in suspension in the fuel by carrying out the test    See T FUEL QUALITY CHECKMove on to Step 6Faults presentThe operation to solve the problem is described in the actual test
6INJECTOR CHECKAll OKProblems encounteredOperation
Check that the injectors are not stuck shut or not perfectly closed by carrying out the    See Test 1056BA INJECTOR OPERATION CHECKMove on to Step 7Faults presentThe operation to solve the problem is described in the actual test
7THROTTLE CASING ERRORS CHECKAll OKProblems encounteredOperation
Connect the diagnostic equipment and check that error P0505 is not presentMove on to Step 8Error P0505 is presentContinue as described by the diagnostic equipment
8DETNATION SENSOR ERRORS CHECKAll OKProblems encounteredOperation
Connect the diagnostic equipment and check that none of the following errors is present: P0325, P0330Move on to Step 9One or more of the errors indicated is presentContinue as described by the diagnostic equipment
9IGNITION COIL CHECKAll OKProblems encounteredOperation
Check that the ignition coils are correctly fitted in their seats.Also check that they do not show any signs of corrosion or dampness.Lastly, check that the ignition coils are working properly, by carrying out the test    See Test 5510CC IGNITION COIL CHECKMove on to Step 10One of the coils is not fitted correctlyRefit the coil correctly    Op. 5510C14 IGNITION COIL/S - R.R.
One of the coils shows signs of corrosion/dampnessReplace the coil    Op. 5510C14 IGNITION COIL/S - R.R.
One of the coils is not working properlyThe operation to solve the problem is described in the actual test
10SPARK PLUGS CHECKAll OKProblems encounteredOperation
Remove the spark plugs    Op. 5510D10 SPARK PLUGS - R+Rand check that they are no signs of faults, following the instructions in the test    See T SPARK PLUG STATE CHECKMove on to Step 11Faults presentThe operation to solve the problem is described in the actual test
11RPM SENSOR CHECKAll OKProblems encounteredOperation
Check that the resistance value of the rpm sensor in all temperature ranges is between 700 and 1200 OhmMove on to Step 12Resistance values outside of the rangeChange the rpm sensor    Op. 5510C26 ENGINE RPM SENSOR - R+R
12PHASE TRANSFORMER ERRORS CHECKAll OKProblems encounteredOperation
Connect the diagnostic equipment and check that none of the following errors is present: P0011, P0014, P0021, P0024Move on to Step 13One or more of the errors indicated is presentContinue as described by the diagnostic equipment
13CYLINDER COMPRESSION CHECKAll OKProblems encounteredOperation
Carry out the cylinder compression check    Op. 0510A10 CYLINDER COMPRESSION - CHECK FOR LOOSE SPARK PLUGS OR INJECTORS Move on to Step 15Cylinder compression insufficientMove on to Step 14
14CHECK ON CAUSE OF INSUFFICIENT COMPRESSIONAll OKProblems encounteredOperation
R/R head for valve leakage test    Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET Check condition of cylinders/piston ringsMove on to Step 15Valve seal insufficientOverhaul the head    Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
Cylinders/piston rings wornRestore the seal
Cylinder head/cylinder block-crankcase matching faultyRestore correct matching
15TIMING CHECKAll OKProblems encounteredOperation
Check that the valve gear timing is correct    Op. 0510A20 TIMING GEAR WITH BELT DRIVE - CHECK - CARRY OUT OPERATION WITH CAM COVER(S) REMOVED AND TAPPETS ADJUSTED AND CRANKSHAFT PULLEY DETACHED (IF NECESSARY) Move on to Step 16Valve gear timing not correctRestore the correct valve gear timing
16EXHAUST SYSTEM CHECKAll OKProblems encounteredOperation
Check that the exhaust circuit is not leaking, there are no loose connections, constrictions, deformations or damageMove on to Step 17Faults presentRestore the correct fastening of the problem components. Replace them if necessary
17ENGINE FASTENINGS CHECKAll OKProblems encounteredOperation
Check that the engine fastenings are not faulty and are tightened to the recommended torqueMove on to Step 18There are faults in the fastenings at the supports, mountings or reaction rodsRestore the correct fastening of the problem components. Replace them if necessary
18CHECK ON CORRECT OPERATIONAll OKProblems encounteredOperation
Check the fault has disappearedEnd of diagnosisThe fault persistsContact the Technical Expert for further information on the problem