Brake Fluid Level: Diagnosis/Troubleshooting
NOTE:
- If brake fluid reservoir level is too low, check if the Brake fluid level warning light is lit and remove the cause for the low level.
DIAGNOSIS/TROUBLESHOOTING - FAULT CODE 4281
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Check brake fluid |
|
OK Step 2 |
Correct the fluid level End |
| 2 | Check ground supply line of level switch for open circuit |
|
< 5 Step 3 |
Open circuit between pin 2 of plug on brake fluid level switch and ground Repair wiring harness End |
| 3 | Check level switch |
|
approx. 100 (at 20 °C) Step 4 |
Level switch faulty Step 7 |
| 4 | Check signal lead of level switch for short circuit to B+ |
|
< 0.3 V Step 5 |
Short circuit to B+ between terminal 36 of PSM control unit and pin 1 of brake fluid level switch End |
| 5 | Check signal lead of level switch for short circuit to ground |
|
Step 6 | Short circuit to ground between terminal 36 of PSM control unit plug and pin 1 of brake fluid level switch End |
| 6 | Check signal lead of level switch for open circuit |
|
< 5 Step 7 |
Open circuit between pin 36 of PSM control unit plug and pin 1 of brake fluid level switch Repair wiring harness End |
| 7 |
|
End | ||
| 8 |
|
End | ||