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| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| 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-market | Move on to Step 1 | The MIL warning lights does not come on when the key is inserted | Continue 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 started | Continue as instructed in the See table K101 MIL WARNING LIGHT STAYS ON (ENGINE STARTS) |
| There are accessories that have been fitted in the after-market | Check that these accessories have been fitted correctly |
| 1 | CONTROL UNIT ELECTRICAL CONNECTIONS CHECK | All OK | Problems encountered | Operation |
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| 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 Ohm | Move on to Step 2 | Connection to earth incorrect | Restore the correct connections |
| Resistance to battery negative more than 0.5 Ohm | Restore the correct connections |
| 2 | CONTROL UNIT FASTENING CHECK | All OK | Problems encountered | Operation |
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| 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 3 | Control unit fastening incorrect | Renew the correct fastening of the control unit Op. 1056F82 CONTROL UNIT SINGLE OF INJECTION IGNITION SYSTEM R R |
| 3 | AIR INTAKE CIRCUIT CHECK | All OK | Problems encountered | Operation |
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| 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 incorrectly | Move on to Step 4 | Air filter blocked | Replace the filter element Op. 1048A14 AIR CLEANER FILTER ELEMENT - REPLACE. |
| Irregular component | Replace the faulty component Op. 1048 ENGINE AIR SUPPLY CIRCUIT |
| Component incorrectly positioned | Refit the component correctly Op. 1048 ENGINE AIR SUPPLY CIRCUIT |
| 4 | FUEL FEED CIRCUIT CHECK | All OK | Problems encountered | Operation |
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| Check there are no faults in the fuel supply circuit by performing the See Test 1040OA FUEL SUPPLY CIRCUIT CHECK | Move on to Step 5 | Faults present | The operation to solve the problem is described in the actual test |
| 5 | CHECK FOR THE PRESENCE OF IMPURITIES IN THE FUEL | All OK | Problems encountered | Operation |
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| 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 CHECK | Move on to Step 6 | Faults present | The operation to solve the problem is described in the actual test |
| 6 | INJECTOR CHECK | All OK | Problems encountered | Operation |
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| Check that the injectors are not stuck shut or not perfectly closed by carrying out the See Test 1056BA INJECTOR OPERATION CHECK | Move on to Step 7 | Faults present | The operation to solve the problem is described in the actual test |
| 7 | THROTTLE CASING ERRORS CHECK | All OK | Problems encountered | Operation |
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| Connect the diagnostic equipment and check that error P0505 is not present | Move on to Step 8 | Error P0505 is present | Continue as described by the diagnostic equipment |
| 8 | DETNATION SENSOR ERRORS CHECK | All OK | Problems encountered | Operation |
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| Connect the diagnostic equipment and check that none of the following errors is present: P0325, P0330 | Move on to Step 9 | One or more of the errors indicated is present | Continue as described by the diagnostic equipment |
| 9 | IGNITION COIL CHECK | All OK | Problems encountered | Operation |
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| 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 CHECK | Move on to Step 10 | One of the coils is not fitted correctly | Refit the coil correctly Op. 5510C14 IGNITION COIL/S - R.R. |
| One of the coils shows signs of corrosion/dampness | Replace the coil Op. 5510C14 IGNITION COIL/S - R.R. |
| One of the coils is not working properly | The operation to solve the problem is described in the actual test |
| 10 | SPARK PLUGS CHECK | All OK | Problems encountered | Operation |
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| 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 CHECK | Move on to Step 11 | Faults present | The operation to solve the problem is described in the actual test |
| 11 | RPM SENSOR CHECK | All OK | Problems encountered | Operation |
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| Check that the resistance value of the rpm sensor in all temperature ranges is between 700 and 1200 Ohm | Move on to Step 12 | Resistance values outside of the range | Change the rpm sensor Op. 5510C26 ENGINE RPM SENSOR - R+R |
| 12 | PHASE TRANSFORMER ERRORS CHECK | All OK | Problems encountered | Operation |
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| Connect the diagnostic equipment and check that none of the following errors is present: P0011, P0014, P0021, P0024 | Move on to Step 13 | One or more of the errors indicated is present | Continue as described by the diagnostic equipment |
| 13 | CYLINDER COMPRESSION CHECK | All OK | Problems encountered | Operation |
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| Carry out the cylinder compression check Op. 0510A10 CYLINDER COMPRESSION - CHECK FOR LOOSE SPARK PLUGS OR INJECTORS | Move on to Step 15 | Cylinder compression insufficient | Move on to Step 14 |
| 14 | CHECK ON CAUSE OF INSUFFICIENT COMPRESSION | All OK | Problems encountered | Operation |
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| R/R head for valve leakage test Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET Check condition of cylinders/piston rings | Move on to Step 15 | Valve seal insufficient | Overhaul the head Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL |
| Cylinders/piston rings worn | Restore the seal |
| Cylinder head/cylinder block-crankcase matching faulty | Restore correct matching |
| 15 | TIMING CHECK | All OK | Problems encountered | Operation |
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| 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 16 | Valve gear timing not correct | Restore the correct valve gear timing |
| 16 | EXHAUST SYSTEM CHECK | All OK | Problems encountered | Operation |
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| Check that the exhaust circuit is not leaking, there are no loose connections, constrictions, deformations or damage | Move on to Step 17 | Faults present | Restore the correct fastening of the problem components. Replace them if necessary |
| 17 | ENGINE FASTENINGS CHECK | All OK | Problems encountered | Operation |
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| Check that the engine fastenings are not faulty and are tightened to the recommended torque | Move on to Step 18 | There are faults in the fastenings at the supports, mountings or reaction rods | Restore the correct fastening of the problem components. Replace them if necessary |
| 18 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
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| Check the fault has disappeared | End of diagnosis | The fault persists | Contact the Technical Expert for further information on the problem |