| | Results of the tests |
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
|---|
| Check
the condition and the correct operation of the engine cooling fan(s) | this check can be carried out by
connecting the diagnostic equipment (Examiner or other instruments)
to the diagnostic socket and carrying out the active diagnosis of
the engine cooling fans:(in the engine management control unit ambient) |
|
Continue to Step
2
| Fan(s) faulty |
Continue to Step
1
|
| 1 | FAN OPERATING CIRCUIT CHECK | All OK | Problems met | Operation |
|---|
| Check, in order: - fan fuses
- fan engagment relays
- fan resistances
- connection between management control unit and fan relays
- connection between fan relays and fans ( See E5020 ENGINE COOLING ).
|
Continue to Step
2
| Connections not correct | Restore the connections |
| Component defective | Replace the component involved (if a fuse is involved,
search for the cause of the problem) |
| Fan resistances faultyNOTE in that case the fan is not working at two different speeds |
Replace the fan resistances
Op. 1088E20 |
| Fan(s) faulty |
Replace fan(s)
Op. 1088E11 |
| 2 | CHECK CORRECT OPERATION | All OK | Problems met | Operation |
|---|
| Check
that the fault is no longer present | End of diagnosis | Fault persists | Search for the
fault starting from another symptom' |