Engine not running smoothly / (irregular operation)
- Make
- Fiat
- Model
- Grande Punto Factory Service Manual
- Year
- 2005–2012
- Section
- Engine › Engine not running smoothly / (irregular operation)
ENGINE NOT RUNNING SMOOTHLY / (IRREGULAR OPERATION)
The customer complains of: The engine is not running smoothly
| Test results | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
Check that the engine oil level is correct Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY Check that the air intake/vacuum circuit is working properly See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECK Check the condition of the fuel supply circuit and make sure that it is working properly See Test 1040OA FUEL SUPPLY CIRCUIT CHECK Check the operation of the low pressure supply circuit See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK Check the fastening of the battery earth terminal | Move on to Step 1 | Oil level incorrect Battery earth terminal insecure | Restore the correct engine oil level See Test 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY Restore the correct earth lead fastening | |
| 1 | AMBIENT PARAMETERS CHECK | All OK | Problems encountered | Operation |
Select the following control unit at the diagnostic equipment: Electronic injection control unit EDC16C39 CF4/EOBD CAN (EP engine 1.9). Check the value of the following parameters: . Battery voltage See Test 5530BB BATTERY VOLTAGE CHECK . Accelerator pedal . Accelerator position 1 AD/C . Accelerator position 2 AD/C See Test 1068AC ACCELERATOR PEDAL CHECKS . Engine coolant temperature See Test 1060OE ENGINE COOLANT TEMPERATURE SENSOR OPERATION CHECK . Diesel temperature See Test 1060EA DIESEL TEMPERATURE CHECK . Measured air mass See Test 1060GG CHECK MEASURED AIR MASS . Engine rpm See Test 1060GI CHECK ENGINE SPEED Reach a constant speed of around 30 km/h and check that the reading on the diagnostic equipment for the vehicle speed coincides more or less with the speed shown on the instrument panel | Move on to Step 4 | The vehicle speed is not measured correctly | Move on to Step 2 | |
| 2 | ABS CHECKS | All OK | Problems encountered | Operation |
Select the following control unit at the diagnostic equipment: Bosch 8 ABS control unit ESP (EP). Check that the system is working properly | Move on to Step 3 | |||
| 3 | SOFTWARE VERSION CHECK | All OK | Problems encountered | Operation |
Check the software version of the Diesel electronic injection control unit EDC16C39 CF4/EOBD CAN (EP engine 1.9) | Move on to Step 4 | |||
| 4 | CLIMATE CONTROL SYSTEM CHECKS | All OK | Problems encountered | Operation |
Select the following control unit at the diagnostic equipment: Diesel electronic injection control unit EDC16C39 CF4/EOBD CAN (EP engine 1.9) Check that the system is working properly See Test 5040OB AIR CONDITIONING SYSTEM OPERATION CHECK (PRESSURE) | Move on to Step 5 | |||
| 5 | PREHEATING RELAY ACTIVE DIAGNOSIS | All OK | Problems encountered | Operation |
Carry out the active diagnosis for the preheating relay, checking that the result is positive. The check on the following system is only necessary if the outside temperature is below 0 °C. | Move on to Step 7 | The result of the active diagnosis is negative | Move on to Step 6 | |
| 6 | HEATER PLUGS CHECK | All OK | Problems encountered | Operation |
Check that the heater plugs are working properly | Move on to Step 7 | |||
| 7 | ELECTRICAL EQUIPMENT CHECK | All OK | Problems encountered | Operation |
| Check that fuse F59 has not blown (second from the left on the second row from the bottom) | Move on to Step 8 | Fuse F59 has blown | Restore the connections or, if necessary, replace the junction unit in the engine compartment Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. | |
| 8 | DIESEL PREHEATING RELAY CHECK | All OK | Problems encountered | Operation |
Check the diesel preheating relay circuit See Test 5505AC | End of diagnosis | |||
The customer complains of: The engine is not running smoothly
| Test results | ||||
| 1 | AMBIENT PARAMETERS CHECK | All OK | Problems encountered | Operation |
|---|---|---|---|---|
Select the following control unit at the diagnostic equipment: Marelli Diesel Injection 6F3 EOBD CAN (EP engine 1.3 JTD). Check the value of the following parameters: - Battery voltage See Test 5530BB BATTERY VOLTAGE CHECK - Clutch pedal See Test 1060GL CHECK OPERATION OF MAIN ENGINE CONTROL UNIT RELAY - Brake pedal status See Test 5550DA BRAKE PEDAL SWITCH OPERATION CHECK - Accelerator position 1 AD/C - Accelerator position 2 AD/C | Move on to Step 2 | |||
| 2 | CONFIGURATION TESTS | All OK | Problems encountered | Operation |
Select the following control unit at the diagnostic equipment: Marelli Diesel Injection 6F3 EOBD CAN (EP engine 1.3 JTD). Check in the Configurations section whether the replacement of any of the following components was not followed by the subsequent configuration: - injector In this case, carry out the configuration checking that the outcome is positive | Move on to Step 5 | The outcome of the configuration is not positive | Move on to Step 3 | |
| 3 | ERRORS CHECK | All OK | Problems encountered | Operation |
Check whether any of the following errors are present using the diagnostic equipment: - P1301 - U0001 - U0426 - U1700 | Move on to Step 5 | 1. Error P1301 is present 2. Error U0001 is present 3. Error U0426 is present 4. Error B1700 is present | 1. Move on to Step 4 2. Continue as indicated See table U0001 CAN line 3. Memorise the CODE. If it is not possible, replace the engine control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R 4. Continue as indicated See table U1700 Communic. with Body Computer (NBC) | |
| 4 | IMA CLASSIFICATION | All OK | Problems encountered | Operation |
| In the Configurations section on the diagnostic tester, rerun the IMA classification and ensure it is successful | End of diagnosis | The classification is unsuccessful | Replace the engine management control unit | |
| 5 | POWER SUPPLY CIRCUIT CHECK | All OK | Problems encountered | Operation |
Check the condition of the fuel supply circuit and make sure that it is working properly See Test 1040OA FUEL SUPPLY CIRCUIT CHECK Check the fastening of the battery earth terminal | Move on to Step 6 | Battery earth terminal insecure | Restore the correct earth lead fastening | |
| 6 | AMBIENT PARAMETERS CHECK | All OK | Problems encountered | Operation |
Select the following control unit at the diagnostic equipment: Marelli Diesel Injection 6F3 EOBD CAN (EP engine 1.3 JTD). Check the value of the following parameters: - Measured Diesel pressure See Test 1060GH DIESEL PRESSURE CHECK - Pressure regulator opening (MPROP) See Test 1060GR CHECK OPERATION OF FUEL PRESSURE SENSOR ON RAIL - Coolant temperature See Test 1060OE ENGINE COOLANT TEMPERATURE SENSOR OPERATION CHECK | Move on to Step 7 | |||
| 7 | INTAKE CIRCUIT CHECK | All OK | Problems encountered | Operation |
| Check that the air intake/vacuum circuit is working properly | Move on to Step 8 | |||
| 8 | AMBIENT PARAMETERS CHECK | All OK | Problems encountered | Operation |
Select the following control unit at the diagnostic equipment: Marelli Diesel Injection 6F3 EOBD CAN (EP engine 1.3 JTD). Check the value of the following parameters: - Engine rpm | End of diagnosis | |||
| Test results | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
First, check: - condition of the air filter; - status of spark plugs and leads; - battery correctly fastened to earth | Move on to Step 1 | Filter element dirty, damaged or not correctly fitted | Replace or restore the correct filter element fitting | |
| Spark plugs dirty or damaged | Replace the spark plugs | |||
| Spark plug leads damaged | Replace spark plug leads | |||
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
Connect the Examiner diagnostic equipment to the diagnostic socket. Check: - that there are no faults in the engine management control unit; - parameter plausibility | Move on to Step 2 | Error detected in the control unit | Continue following the instructions for the diagnostic equipment | |
| Parameter not consistent | Continue following the instructions for the diagnostic equipment | |||
| 2 | ROAD TEST USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
Carry out a road test by reproducing the conditions in which the fault occurs, keeping the tester connected. Check: - that there are no faults in the engine management control unit; - parameter plausibility | Move on to Step 3 | The sudden onset of an error in the control unit is detected | Continue following the instructions for the diagnostic equipment | |
| Parameter not consistent | Continue following the instructions for the diagnostic equipment | |||
| 3 | FUEL PRESSURE CHECK | All OK | Problems encountered | Operation |
Check the fuel supply pressure, if necessary on the road (to reproduce the conditions in which the problem occurs) | Move on to Step 4 | Pressure not correct: obstructions in the fuel supply pipe | Remove the obstructions in the fuel pipe, replace it if necessary | |
| Pressure not correct: tank not sufficiently ventilated | Restore the tank ventilation | |||
| Pressure not correct: fuel pump electric circuit interrupted | Restore fuel pump electric circuit | |||
| Pressure not correct: petrol pump damaged | Replace the petrol pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R | |||
| 4 | AIR CONDITIONING SYSTEM CHECK | All OK | Problems encountered | Operation |
| Road test the vehicle, checking that the irregular behaviour does not occur when the air conditioning is switched on or off | Move on to Step 5 | Fault only present with the air conditioning switched on | Proceed as instructed in the | |
| 5 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists: control unit defective | Replace the control unit | |
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