Check engine cooling fan operation
- Make
- Fiat
- Model
- 500 Factory Service Manual
- Year
- 2007–2024
- Section
- Engine cooling › Check engine cooling fan operation
CHECK ENGINE COOLING FAN OPERATION
| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK | |
|---|---|---|
| 1 | Turn the ignition ON and check the fan is off. | Move on to Step 4 |
| 2 | Turn the ignition key ON. On the diagnostic tester, select active diagnosis level 1 fan relay control and check it is successful. | Move on to Step 9 |
| 3 | On the diagnostic tester, select active diagnosis level 2 fan relay control and check it is successful. | Move on to Step 22 |
| 4 | Turn the ignition key OFF. In the engine compartment junction unit, remove relay T2 (in the top left of the four in the middle) Turn the ignition key ON. Measure the voltage between Pin 87 of the relay base unit and Earth, ensuring it is less than 0.3 V. Move on to Step 8. | Move on to Step 5 |
| 5 | Turn the ignition key OFF. In the engine compartment junction unit, remove relay T1 (the bottom left of the four in the middle) Turn the ignition key ON. Measure the voltage between Pin 87 of relay T2 base unit and Earth, ensuring it is less than 0.3 V. | Repair or if necessary replace the electrical wiring between the engine fan motor and the engine compartment junction unit |
| 6 | Connect a (3 W) test lamp and a multimeter in parallel and measure the voltage between pins 85 of the base unit of relay T1 and earth, checking that it is greater than 0.3 V. | Replace relay T1 |
| 7 | If faults are present, repair or, if necessary, replace the electrical wiring between the engine management control unit and the engine compartment junction unit. The test can be considered over | Replace the engine management control unit |
| 8 | Connect a (3 W) test lamp and a multimeter in parallel and measure the voltage between pins 85 of the base unit of relay T2 and the battery positive, checking that it is greater than 0.3 V. Move on to Step 7. | Replace relay T2. |
| 9 | See M010 ENGINE MANAGEMENT ECU | Move on to Step 10 |
| 10 | Remove fuse F13 (second from the left) in the engine compartment junction unit and check it has not blown. Move on to Step 16. | Move on to Step 11 |
| 11 | Fit a new fuse F13 and check it does not blow. | Restore the correct electrical connections in the engine compartment junction unit If necessary, replace it Op. 5505A13 |
| 12 | Connect a shunt cable with a fuse across pin 87 of the base unit for relay T2 and the battery positive, checking that it has not blown. Continue to step 14. | Move on to Step 13 |
| 13 | If faults are present, repair or, if necessary, replace the electrical wiring between the engine management control unit and the engine compartment junction unit. The test can be considered over | Replace the fan |
| 14 | Disconnect the shunt connection. Turn the ignition key ON. On the diagnostic tester, select active diagnosis level 2 fan relay control and check fuse F13 does not blow. | Replace relay T2. |
| 15 | Turn the ignition key OFF. In the engine compartment junction unit, remove relay T1 (the bottom left of the four in the middle) Connect a shunt cable with a fuse across pin 87 of the relay base unit and the battery positive, checking that it has not blown. Move on to Step 13. | Replace relay T1 |
| 16 | Measure the voltage between fuse F13 input contact and earth, checking it is greater than 11 V | Repair or if necessary replace the electrical wiring between the battery positive and the engine compartment junction unit |
| 17 | Restore the correct electrical connections in the engine compartment junction unit If necessary, replace it Op. 5505A13 The test can be considered over | |
| 18 | Connect a test bulb (3W) between Pins 85 and 86 of relay T2 base unit. Turn the ignition key ON. On the diagnostic tester, select active diagnosis level 1 fan relay control and check the bulb flashes. | Move on to Step 7 |
| 19 | Turn the ignition key OFF. Connect a bridge with a fuse to Pins 30 and 87 of the base unit for relay T2. Check that the fan does not turn at low speed. | Replace relay T2. |
| 20 | Disconnect the shunt connection. Disconnect the wiring harness connector from the engine fan motor. Measure the resistance between Pin 87 of relay T2 base unit and Pin 2 of the motor, checking that it is less than 5 Ohm | Repair or if necessary replace the electrical wiring between the engine fan motor and the engine compartment junction unit |
| 21 | If faults are present, repair or if necessary replace the electrical wiring between the engine fan motor and earth The test can be considered over | Replace the fan |
| 22 | Turn the ignition key OFF. In the engine compartment junction unit, remove relay T1 (the bottom left of the four in the middle) Measure the voltage between Pins 30 and 86 of the relay base unit and the earth, ensuring it is greater than 11 V. | Restore the correct electrical connections in the engine compartment junction unit If necessary, replace it Op. 5505A13 |
| 23 | Connect a test bulb (3W) between Pins 85 and 86 of relay T1 base unit. Turn the ignition key ON. On the diagnostic tester, select active diagnosis level 2 fan relay control and check the bulb flashes. | Move on to Step 7 |
| 24 | Turn the ignition key OFF. Connect a shunt connection lead with a fuse between Pins 30 and 87 of the base unit of relay T1 and check that the fan turns at high speed. | Move on to Step 13 |
| 25 | Replace relay T1 |
| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK | |
|---|---|---|
| 1 | Turn the ignition ON and check the fan is off. | Move on to Step 4 |
| 2 | Turn the ignition key ON. On the diagnostic tester, select active diagnosis level 1 fan relay control and check it is successful. | Move on to Step 13 |
| 3 | On the diagnostic tester, select active diagnosis level 2 fan relay control and check it is successful. | Move on to Step 27 |
| 4 | On the diagnostic tester, select active diagnosis high level fan relay control and check it is successful. The test can be considered over | Move on to Step 40 |
| 5 | Turn the ignition key OFF. In the engine compartment junction unit, remove relay T2 (in the top left of the four in the middle) Turn the ignition key ON. Measure the voltage between Pin 87 of the relay base unit and Earth, ensuring it is less than 0.3 V. Move on to Step 11. | Move on to Step 6 |
| 6 | Turn the ignition key OFF. In the engine compartment junction unit, remove relay T20 (in the bottom right of the four in the middle) Connect a test bulb (3W) between Pins 85 and 86 of the relay base unit and check it does not come on. Move on to Step 8 | Move on to Step 7 |
| 7 | If faults are present, repair or, if necessary, replace the electrical wiring between the engine management control unit and the engine compartment junction unit. The test can be considered over | Replace the engine management control unit |
| 8 | Disconnect the wiring harness connector from the engine fan motor. Turn the ignition key ON. Measure the voltage between Pin 2 of the motor and Earth, ensuring it is less than 0.3 V. | Repair or if necessary replace the electrical wiring between the engine fan motor and the engine compartment junction unit |
| 9 | Measure the voltage between Pin 87 of relay T2 base unit and Earth, ensuring it is less than 0.3 V. | Repair or if necessary replace the electrical wiring between the engine fan motor and the engine compartment junction unit |
| 10 | If faults are present, repair or, if necessary, replace the electrical wiring between the engine management control unit and the engine compartment junction unit. The test can be considered over | Replace relay T20 |
| 11 | Turn the ignition key OFF. Connect a test bulb (3W) between Pins 85 and 86 of relay T1 base unit (bottom left of the four in the middle) and check it does not come on. | Move on to Step 7 |
| 12 | Replace relay T1 The test can be considered over | |
| 13 | See M010 ENGINE MANAGEMENT ECU | Move on to Step 14 |
| 14 | Remove fuse F13 (second from the left) in the engine compartment junction unit and check it has not blown. Move on to Step 21. | Move on to Step 15 |
| 15 | Fit a new fuse F13 and check it does not blow. | Restore the correct electrical connections in the engine compartment junction unit If necessary, replace it Op. 5505A13 |
| 16 | Connect a shunt cable with a fuse across pin 87 of the base unit for relay T2 and the battery positive, checking that it has not blown. Continue to step 24. | Move on to Step 17 |
| 17 | Connect a test bulb (3W) between Pins 85 and 86 of relay T2 base unit. Turn the ignition key ON. The test can be considered over | Replace the fan |
| 18 | Disconnect the shunt connection. Replace relay T2. Turn the ignition key ON. On the diagnostic tester, select active diagnosis level 1 fan relay control and check fuse F13 does not blow. | Replace relay T2. |
| 19 | Turn the ignition key OFF. In the engine compartment junction unit, remove relay T20 (in the bottom right of the four in the middle) Connect a shunt cable with a fuse across pin 87 of the relay base unit and the battery positive, checking that it has not blown. | Move on to Step 17 |
| 20 | Replace relay T20 The test can be considered over | |
| 21 | Measure the voltage between fuse F13 input contact and earth, checking it is greater than 11 V | Repair or if necessary replace the electrical wiring between the battery positive and the engine compartment junction unit |
| 22 | Restore the correct electrical connections in the engine compartment junction unit If necessary, replace it Op. 5505A13 The test can be considered over | |
| 23 | Connect a test bulb (3W) between Pins 85 and 86 of relay T2 base unit. On the diagnostic tester, select active diagnosis level 1 fan relay control and check the bulb flashes. | Move on to Step 7 |
| 24 | Turn the ignition key OFF. Connect a bridge with a fuse to Pins 30 and 87 of the base unit for relay T2. In the engine compartment junction unit, remove relay T20 (in the bottom right of the four in the middle) Connect a (10 W) test lamp and a multimeter in parallel and measure the voltage between pins 30 of the base unit of relay T20 and earth, checking that it is greater than 11 V. Move on to Step 27 | Move on to Step 25. |
| 25 | Disconnect the wiring harness connector from the engine fan motor. Turn the ignition key ON. Measure the voltage between Pin 2 of the motor and Earth, ensuring it is greater than 11 V. | Repair or if necessary replace the electrical wiring between the engine fan motor and the engine compartment junction unit |
| 26 | If faults are present, repair or if necessary replace the electrical wiring between the engine fan motor and earth The test can be considered over | Replace the fan |
| 27 | Turn the ignition key OFF. Disconnect the engine fan adjustment resistance. Connect a test bulb (3W) between resistance pins 1 and 3 (wiring side) See O010 ENGINE FAN ADJUSTMENT RESISTANCE - 1 Turn the ignition key ON. On the diagnostic tester, select active diagnosis level 2 fan relay control and check the bulb flashes. Move on to Step 29 | Move on to Step 28 |
| 28 | Measure the voltage between Pin 1 (wiring side) of the resistance and Earth, ensuring it is greater than 11 V. See O010 ENGINE FAN ADJUSTMENT RESISTANCE - 1 Move on to Step 7 | Restore the correct electrical connections in the engine compartment junction unit If necessary, replace it Op. 5505A13 |
| 29 | Turn the ignition key OFF. Disconnect the test bulb. Measure the voltage between Pin 3 (wiring side) of the resistance and Earth, ensuring it is greater than 11 V. See O010 ENGINE FAN ADJUSTMENT RESISTANCE - 1 Move on to Step 37 | Move on to Step 30 |
| 30 | Remove fuse F12 (first from the left in the second group from the top) in the engine compartment junction unit and check it has not blown. Move on to Step 35. | Move on to Step 31 |
| 31 | Fit a new fuse F12 and check it does not blow. | Restore the correct electrical connections in the engine compartment junction unit If necessary, replace it Op. 5505A13 |
| 32 | Turn the ignition key ON. On the diagnostic tester, select active diagnosis high level fan relay control and check fuse F12 does not blow. | Replace relay T1 |
| 33 | Turn the ignition key OFF. Connect a shunt cable with a fuse across Pin 1 (wiring side) of the resistance and the battery positive. See O010 ENGINE FAN ADJUSTMENT RESISTANCE - 1 Check that the shunt connection fuse does not cut in | Replace the resistance |
| 34 | If faults are present, repair or, if necessary, replace the electrical wiring between the engine management control unit and the engine compartment junction unit. The test can be considered over | Replace the fan |
| 35 | Measure the voltage between fuse F12 input contact and earth, checking it is greater than 11 V | Repair or if necessary replace the electrical wiring between the battery positive and the engine compartment junction unit |
| 36 | Restore the correct electrical connections in the engine compartment junction unit If necessary, replace it Op. 5505A13 The test can be considered over | |
| 37 | Disconnect the wiring harness connector from the engine fan motor. Connect a shunt connection cable with a fuse between Pins 1 and 3 (wiring side) of the resistance See O010 ENGINE FAN ADJUSTMENT RESISTANCE - 1 Measure the voltage between Pin 2 (wiring side) of the motor and Earth, ensuring it is greater than 11 V. | Repair or if necessary replace the electrical wiring between the engine fan motor and the engine fan adjustment resistance |
| 38 | Remove the fuse from the shunt connection. Connect the wiring harness connector to the engine fan motor. Refit the fuse in the shunt lead, checking that the fan motor does not activate. | Replace the resistance |
| 39 | Replace the fan Op. 1088E10 RADIATOR COOLING FAN - R + R The test can be considered over | |
| 40 | Turn the ignition key OFF. In the engine compartment junction unit, remove relay T1 (the bottom left of the four in the middle) Measure the voltage between Pin 30 of the base unit for relay T1 and the earth, ensuring it is greater than 11 V. | Restore the correct electrical connections in the engine compartment junction unit If necessary, replace it Op. 5505A13 |
| 41 | Measure the voltage between Pin 86 of the base unit for relay T1 and the earth, ensuring it is greater than 11 V. | Restore the correct electrical connections in the engine compartment junction unit If necessary, replace it Op. 5505A13 |
| 42 | Connect a test bulb (3W) between Pins 85 and 86 of relay T1 base unit. Turn the ignition key ON. On the diagnostic tester, select active diagnosis high level fan relay control and check the bulb flashes. | Move on to Step 7 |
| 43 | If faults are present, repair or, if necessary, replace the electrical wiring between the engine management control unit and the engine compartment junction unit. | Replace the fan |
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