Fault code 4480: Diagnosis/troubleshooting
DIAGNOSIS/TROUBLESHOOTING CHART - FAULT CODE 4480
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Check supply voltage of the booster pump for short circuit to ground/open circuit |
|
> 11 V Step 2 |
Short circuit to ground or open circuit between PSM control module plug pin 2 and fuse F1 -> End |
| 2 | Check signal lead of the booster pump for short circuit to voltage |
|
< 0.3 V Step 3 |
Short circuit to voltage between PSM control module plug pin 4 and pin 1 of PSM booster pump plug -> End |
| 3 | Check signal lead of the booster pump for short circuit to ground |
|
> 500 k Step 4 |
Short circuit to ground between PSM control module plug pin 4 and pin 1 of PSM booster pump plug -> End |
| 4 | Check signal lead of the booster pump for short circuit to voltage |
|
< 0.3 V Step 5 |
Short circuit to voltage between PSM control module plug pin 3 and pin 2 of PSM booster pump plug -> End |
| 5 | Check signal lead of the booster pump for short circuit to ground |
|
> 500 k Step 6 |
Short circuit to ground between PSM control module plug pin 3 and pin 2 of PSM booster pump plug -> End |
| 6 | Check activation of the booster with the PST2 |
|
> 11 V Step 7 |
PSM hydraulic unit faulty -> End |
| 7 | Booster pump faulty | -> End | ||