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Fiat 500 Factory Service Manual (2007-2024)22 · Fault diagnosis
22 · Diagnostics

Electric fan stays on all the time

Make
Fiat
Model
500 Factory Service Manual
Year
2007–2024
Section
Engine › Electric fan stays on all the time
Fault diagnosisElectric fan stays on all the time

ELECTRIC FAN STAYS ON ALL THE TIME

1.2 8v, 1.4 16v

Test results
0PRELIMINARY CHECKSAll OKProblems encounteredOperation

Check the following, in order:

  • Correct engine oil level
  • Possible oil leaks
  • Correct coolant level
  • Possible coolant leaks
  • Radiator blocked
Move on to Step 1

1. Engine oil level not correct

2. Oil leaks

3. Coolant level not correct

4. Coolant leaks

5. Radiator blocked

1. Top up to the correct oil level

2. Eliminate leaks

3. Top up level

4. Eliminate leaks

5. Descale radiator

1CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation

Connect the Examiner diagnostic equipment to the engine control unit.

Check:

  • that there are no errors in the control unit;
  • parameter plausibility.
Move on to Step 2

1. Error detected in the control unit

2. Parameters not plausible

1. Continue following the instructions on the diagnostic equipment

2. Continue following the instructions on the diagnostic equipment

2CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation

Connect the Examiner diagnostic equipment to the climate control system control unit.

Check:

  • that there are no errors in the control unit;
  • parameter plausibility.
Move on to Step 3

1. Onset of the error detected in the control unit

2. Parameters not plausible

1. Continue following the instructions on the diagnostic equipment

2. Continue following the instructions on the diagnostic equipment

3WATER TEMPERATURE SENSOR CHECKAll OKProblems encounteredOperation

Check that the water temperature sensor is working properly by carrying out the

See Test 1056BC ENGINE COOLANT TEMPERATURE SENSOR OPERATION CHECK

Move on to Step 4

1. Sensor defective

2. Sensor wiring connection irregular

1. Replace the sensor

Op. 1056B50

2. Restore the correct connection.

4WIRING CHECKAll OKProblems encounteredOperation

Check the continuity of the connections between the engine management control unit and fuse control unit

Check that the fan control relays are working properly

See E5020 ENGINE COOLING

Move on to Step 5

1. Wiring defective

2. Relays defective

1. Restore the correct wiring.

2. Replace the relays

5THERMOSTAT CHECKAll OKProblems encounteredOperation
Check that the thermostat is working properlyMove on to Step 6Thermostat defective

Replace the thermostat

Op. 1088C40

6ENGINE CONTROL UNIT CHECKAll OKProblems encounteredOperation
Check that the engine control unit is working properlyEnd of diagnosisEngine management control unit defective

Replace the engine management control unit

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

1.3 Multijet

Test results
0PRELIMINARY CHECKSAll OKProblems encounteredOperation

Check the following, in order:

  • Correct engine oil level
  • Possible oil leaks
  • Correct coolant level
  • Possible coolant leaks
  • Radiator blocked
Move on to Step 1

1. Engine oil level not correct

2. Oil leaks

3. Coolant level not correct

4. Coolant leaks

5. Radiator blocked

1. Top up to the correct oil level

2. Eliminate leaks

3. Top up to the correct level.

4. Eliminate leaks

5. Clean radiator

1CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation

Connect the Examiner diagnostic equipment to the engine control unit.

Check:

  • that there are no errors in the control unit;
  • parameter plausibility.
Move on to Step 2

1. Error detected in the control unit

2. Parameters not plausible

1. Continue following the instructions on the diagnostic equipment

2. Continue following the instructions on the diagnostic equipment

2CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation

Connect the Examiner diagnostic equipment to the climate control system control unit.

Check:

  • that there are no errors in the control unit;
  • parameter plausibility.
Move on to Step 3

1. Onset of the error detected in the control unit

2. Parameters not plausible

1. Continue following the instructions for the diagnostic equipment.

2. Continue following the instructions for the diagnostic equipment.

3WATER TEMPERATURE SENSOR CHECKAll OKProblems encounteredOperation

Check that the water temperature sensor is working properly by carrying out the

See Test 1060OE ENGINE COOLANT TEMPERATURE SENSOR OPERATION CHECK

Move on to Step 4

1. Sensor defective

2. Sensor wiring connection irregular.

1. Replace the sensor

Op. 1060G14 ENGINE COOLANT TEMPERATURE SENSOR - R.R.

2. Restore the correct connection.

4WIRING CHECKAll OKProblems encounteredOperation

Check the continuity of the connections between the engine management control unit and fuse control unit

Check that the fan control relays are working properly

See E5020 ENGINE COOLING

Move on to Step 5

1. Wiring defective

2. Relays defective

1. Restore the correct wiring.

2. Replace the relays

5THERMOSTAT CHECKAll OKProblems encounteredOperation
Check that the thermostat is working properly.Move on to Step 6Thermostat defective

Replace the thermostat

Op. 1088C40

6ENGINE CONTROL UNIT CHECKAll OKProblems encounteredOperation
Check that the engine control unit is working properly.End of diagnosisEngine management control unit defective

Replace the engine management control unit

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

Parts & tools for this job For 2007 Fiat 500

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