Workshop Manuals Factory service & repair Fiat
01 General information02 Specifications03 Manufacturing data and tolerances04 Tightening torques05 Fluids and lubricants06 Maintenance07 Diagnostic checks08 Engine09 Clutch10 Gearbox and differential11 Axles and driveshafts12 Brakes13 Steering14 Suspension and wheels15 Heating, air conditioning and auxiliary units16 Electrical equipment17 Body fittings18 Body panels and frame19 Wiring diagrams and electrical functions20 Wiring harnesses21 Connectors and pin-outs22 Fault diagnosis23 Special tools
Fiat Grande Punto Factory Service Manual (2005-2012)22 · Fault diagnosis
22 · Diagnostics

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)
Fault diagnosisEngine not running smoothly / (irregular operation)

ENGINE NOT RUNNING SMOOTHLY / (IRREGULAR OPERATION)

1.9 Multijet

The customer complains of: The engine is not running smoothly

Test results
0PRELIMINARY CHECKSAll OKProblems encounteredOperation

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

See E1020 EARTHS

1AMBIENT PARAMETERS CHECKAll OKProblems encounteredOperation

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 4The vehicle speed is not measured correctlyMove on to Step 2
2ABS CHECKSAll OKProblems encounteredOperation

Select the following control unit at the diagnostic equipment: Bosch 8 ABS control unit ESP (EP).

Check that the system is working properly

See Test 3340AB SPEED SIGNAL CHECK

Move on to Step 3
3SOFTWARE VERSION CHECKAll OKProblems encounteredOperation

Check the software version of the Diesel electronic injection control unit EDC16C39 CF4/EOBD CAN (EP engine 1.9)

See Test 1060GJ CHECK ENGINE CONTROL UNIT SOFTWARE RELEASE

Move on to Step 4
4CLIMATE CONTROL SYSTEM CHECKSAll OKProblems encounteredOperation

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
5PREHEATING RELAY ACTIVE DIAGNOSISAll OKProblems encounteredOperation

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 7The result of the active diagnosis is negativeMove on to Step 6
6HEATER PLUGS CHECKAll OKProblems encounteredOperation

Check that the heater plugs are working properly

See Test 5520CA CHECK GLOW PLUG OPERATION

Move on to Step 7
7ELECTRICAL EQUIPMENT CHECKAll OKProblems encounteredOperation
Check that fuse F59 has not blown (second from the left on the second row from the bottom)Move on to Step 8Fuse 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.

8DIESEL PREHEATING RELAY CHECKAll OKProblems encounteredOperation

Check the diesel preheating relay circuit

See Test 5505AC

End of diagnosis

1.3 Multijet

The customer complains of: The engine is not running smoothly

Test results
1AMBIENT PARAMETERS CHECKAll OKProblems encounteredOperation

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

See Test 1068AC ACCELERATOR PEDAL CHECKS

Move on to Step 2
2CONFIGURATION TESTSAll OKProblems encounteredOperation

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 5The outcome of the configuration is not positiveMove on to Step 3
3ERRORS CHECKAll OKProblems encounteredOperation

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)

4IMA CLASSIFICATIONAll OKProblems encounteredOperation
In the Configurations section on the diagnostic tester, rerun the IMA classification and ensure it is successfulEnd of diagnosisThe classification is unsuccessful

Replace the engine management control unit

Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R

5POWER SUPPLY CIRCUIT CHECKAll OKProblems encounteredOperation

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 6Battery earth terminal insecure

Restore the correct earth lead fastening

See E1020 EARTHS

6AMBIENT PARAMETERS CHECKAll OKProblems encounteredOperation

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
7INTAKE CIRCUIT CHECKAll OKProblems encounteredOperation
Check that the air intake/vacuum circuit is working properlyMove on to Step 8
8AMBIENT PARAMETERS CHECKAll OKProblems encounteredOperation

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

See Test 1060GI CHECK ENGINE SPEED

End of diagnosis

1.2 8v, 1.4 8v

Test results
0PRELIMINARY CHECKSAll OKProblems encounteredOperation

First, check:

- condition of the air filter;

- status of spark plugs and leads;

- battery correctly fastened to earth

Move on to Step 1Filter element dirty, damaged or not correctly fittedReplace or restore the correct filter element fitting
Spark plugs dirty or damaged

Replace the spark plugs

Op. 5510D10 SPARK PLUGS - R+R

Spark plug leads damagedReplace spark plug leads
1CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation

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 2Error detected in the control unitContinue following the instructions for the diagnostic equipment
Parameter not consistentContinue following the instructions for the diagnostic equipment
2ROAD TEST USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation

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 3The sudden onset of an error in the control unit is detectedContinue following the instructions for the diagnostic equipment
Parameter not consistentContinue following the instructions for the diagnostic equipment
3FUEL PRESSURE CHECKAll OKProblems encounteredOperation

Check the fuel supply pressure, if necessary on the road (to reproduce the conditions in which the problem occurs)

Op. 0510C10 FUEL SYSTEM - CHECK DELIVERY PRESSURE

Move on to Step 4Pressure not correct: obstructions in the fuel supply pipeRemove the obstructions in the fuel pipe, replace it if necessary
Pressure not correct: tank not sufficiently ventilatedRestore the tank ventilation
Pressure not correct: fuel pump electric circuit interruptedRestore 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

4AIR CONDITIONING SYSTEM CHECKAll OKProblems encounteredOperation
Road test the vehicle, checking that the irregular behaviour does not occur when the air conditioning is switched on or offMove on to Step 5Fault only present with the air conditioning switched on

Proceed as instructed in the

See table L010 CLIMATE CONTROL NOT COOLING

5CHECK ON CORRECT OPERATIONAll OKProblems encounteredOperation
Check that the fault is no longer presentEnd of diagnosisFault persists: control unit defective

Replace the control unit

Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R

Parts & tools for this job For 2005 Fiat Grande Punto

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