| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK |
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| 1 | Turn the ignition ON and check the fans are off. | Move on to Step 5 |
| 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 19 |
| 3 | On the diagnostic tester, select active diagnosis level 2 fan relay control and check it is successful. | Move on to Step 39 |
| 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 52 |
| 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 the relay base unit and Earth, ensuring it is less than 0.3 V.Move on to Step 17. | Move on to Step 6 |
| 6 | 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 30 of the relay base unit and Earth, ensuring it is less than 0.3 V.Move on to Step 12. | Move on to Step 7 |
| 7 | 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 9 | Move on to Step 8 |
| 8 | If faults are present, repair or, if necessary, replace the electrical wiring between the engine management control unit and the engine compartment junction unit. See E5020 ENGINE COOLING The test can be considered over | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R |
| 9 | Disconnect the wiring harness connector from the engine fan motor.Turn the ignition key ON.Measure the voltage between Pin 1 of the motor and Earth, ensuring it is less than 0.3 V. See N011 FAN MOTOR | Repair or if necessary replace the electrical wiring between the engine fan motor and the engine compartment junction unit See E5020 ENGINE COOLING |
| 10 | Measure the voltage between Pin 87 of the relay T1 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 See E5020 ENGINE COOLING |
| 12 | Turn the ignition key OFF.Connect a test bulb (3W) between Pins 1 and 2 of the relay base unit. See J030 ENGINE FAN FIRST SPEED RELAYand check it does not come on | Move on to Step 8 |
| 13 | Disconnect the test bulb.Disconnect the wiring harness connector from the engine fan motor 2.Turn the ignition key ON.Measure the voltage between Pin 1 of the motor and Earth, ensuring it is less than 0.3 V. See N012 ENGINE FAN MOTOR - 2Move on to Step 15 | Move on to Step 14 |
| 14 | If faults are present, repair or, if necessary, replace the electrical wiring between engine fan motor 2 and the engine compartment junction unit. See E5020 ENGINE COOLING The test can be considered over | Replace the engine fan first speed relay |
| 15 | Connect the relay See J030 ENGINE FAN FIRST SPEED RELAYMeasure the voltage between Pin 87 of relay T2 base unit and Earth, ensuring it is less than 0.3 V. | Move on to Step 14 |
| 16 | Replace relay T2.The test can be considered over | - |
| 17 | Turn the ignition key OFF.Connect a test bulb (3W) between Pins 85 and 86 of relay T1 base unit and check it does not come on. | Move on to Step 8 |
| 18 | Replace relay T1The test can be considered over | - |
| 19 | See M010 ENGINE MANAGEMENT ECU | Move on to Step 20 |
| 20 | 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 27. | Move on to Step 21 |
| 21 | Fit a new fuse F12 and check it does not blow. | Restore the correct electrical connections in the engine compartment junction unit See E5020 ENGINE COOLING If necessary, replace it Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 22 | Connect a shunt cable with a fuse across pin 87 of the base unit for relay T1 and the battery positive, checking that it has not blown. Continue to step 24. | Move on to Step 23 |
| 23 | Connect a test bulb (3W) between Pins 85 and 86 of relay T1 base unit.Turn the ignition key ON.The test can be considered over | Replace the fan Op. 1088E10 RADIATOR COOLING FAN - R + R |
| 24 | Disconnect the shunt connection.Replace relay T1.Turn the ignition key ON.On the diagnostic tester, select active diagnosis level 1 fan relay control and check fuse F12 does not blow. | Replace relay T1 |
| 25 | 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 23 |
| 26 | Replace relay T20The test can be considered over | - |
| 27 | 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 See E1010 POWER SUPPLY |
| 28 | Restore the correct electrical connections in the engine compartment junction unit See E5020 ENGINE COOLING If necessary, replace it Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. The test can be considered over | - |
| 29 | Connect a test bulb (3W) between Pins 85 and 86 of relay T1 base unit.On the diagnostic tester, select active diagnosis level 1 fan relay control and check the bulb flashes. | Move on to Step 8 |
| 30 | Turn the ignition key OFF.Connect a shunt lead with a fuse between Pins 30 and 87 of the base unit for relay T1.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 33 | Move on to Step 31. |
| 31 | Disconnect the wiring harness connector from the engine fan motor.Turn the ignition key ON.Measure the voltage between Pin 1 of the motor and Earth, ensuring it is greater than 11 V. See N011 FAN MOTOR | Repair or if necessary replace the electrical wiring between the engine fan motor and the engine compartment junction unit See E5020 ENGINE COOLING |
| 32 | If faults are present, repair or, if necessary, replace the electrical wiring between the engine management control unit and the engine compartment junction unit. See E5020 ENGINE COOLING The test can be considered over | Replace the fan Op. 1088E10 RADIATOR COOLING FAN - R + R |
| 33 | Disconnect the test bulb.Disconnect the shunt connection.Connect a shunt cable with a fuse between across pin 2 of the relay base unit and the battery positive. See J030 ENGINE FAN FIRST SPEED RELAYCheck that engine fan 2 does not turn at high speed. | Replace the engine fan first speed relay |
| 34 | Check that the shunt connection fuse does not cut inMove on to Step 37 | Move on to Step 35 |
| 35 | Disconnect the shunt connection.In the engine compartment junction unit, remove relay T2 (in the top left of the four in the middle)Disconnect the wiring harness connector from the engine fan motor 2.Measure the resistance between Pin 5 of the relay base unit and Earth, ensuring it is greater than 500 kOhm See J030 ENGINE FAN FIRST SPEED RELAY | Repair or if necessary replace the electrical wiring between the engine fan motor 2 and engine fan speed relay 1. See E5020 ENGINE COOLING |
| 36 | Replace the fan Op. 1088E10 RADIATOR COOLING FAN - R + R The test can be considered over | - |
| 37 | Disconnect the wiring harness connector from the engine fan motor 2.Measure the voltage between Pin 1 of the motor (wiring side) and Earth. Ensure it is greater than 11V. See N012 ENGINE FAN MOTOR - 2 | Repair or if necessary replace the electrical wiring between engine fan motor 2 and the engine compartment junction unit See E5020 ENGINE COOLING |
| 38 | If faults are present, repair or, if necessary, replace the electrical wiring between engine fan motor 2 and the engine compartment junction unit. See E5020 ENGINE COOLING The test can be considered over | Replace the fan Op. 1088E10 RADIATOR COOLING FAN - R + R |
| 39 | Turn the ignition key OFF.Disconnect the relay. See J030 ENGINE FAN FIRST SPEED RELAYConnect a test bulb (3W) between Pins 85 and 86 of the relay 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 41 | Move on to Step 40 |
| 40 | Measure the voltage between Pin 2 of the relay base unit and the earth, ensuring it is greater than 11 V. See J030 ENGINE FAN FIRST SPEED RELAYMove on to Step 8 | Repair or if necessary replace the electrical wiring between the engine compartment junction unit and engine fan speed relay 1. See E5020 ENGINE COOLING |
| 41 | Turn the ignition key OFF.Disconnect the test bulb.Measure the voltage between Pin 3 of the relay base unit and the earth, ensuring it is greater than 11 V. See J030 ENGINE FAN FIRST SPEED RELAYMove on to Step 49 | Move on to Step 42 |
| 42 | Remove fuse F13 (second from the left) in the engine compartment junction unit and check it has not blown.Move on to Step 47. | Move on to Step 43 |