Fault code 4281: Diagnosis/troubleshooting
DIAGNOSIS/TROUBLESHOOTING CHART - FAULT CODE 4281
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Brake fluid |
|
OK Step 2 |
Correct the fluid level -> End |
| 2 | Check ground lead of the level switch |
|
< 5 Step 3 | Open circuit between terminal 2 of plug on brake fluid level switch and ground point 3 -> End |
| 3 | Check level switch |
|
approx. 100 (at 20 °C) Step 4 |
-> End |
| 4 | Check signal lead of the level switch |
|
< 5 Step 5 |
Open circuit between PSM control module plug terminal 36 and brake fluid level switch terminal 1 -> End |
| 5 | Check signal lead of the level switch for short circuit to B+ |
|
< 0.3 V Step 6 | Short circuit to voltage between PSM control module plug terminal 36 and brake fluid level switch terminal 1 and instrument cluster plug terminal II/4 -> End |
| 6 | Check signal lead of the level switch for short circuit to ground |
|
> 500 Step 7 |
Short circuit to ground between PSM control module plug terminal 36 and brake fluid level switch terminal 1 and instrument cluster plug terminal II/4 -> End |
| 7 | PSM control module faulty | -> End | ||