1F1B50

1F1B50 - P0687

Information saved in
DME

Fault code
1F1B50 - P0687

Fault text
System voltage, DME master relay: voltage too high

Fault description
The diagnostic function monitors the battery voltage relative
to an upper limit.

Condition for fault identification
Test condition:
Electrical system voltage above 16 V
Potential problem source(s):
- Systematic fault, for instance, jump start with 24 V
- Defect in power supply to DME
Terminal condition: none
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- None
Time condition:
- 2 min. after engine start
Other conditions:
- Speed > 20 km/h

Condition for fault memory entry
This fault is logged in the control module's fault memory
immediately.

Action in service
- If an overvoltage fault is logged in the fault memories of
multiple control modules then the source is a systematic
malfunction in the vehicle (for instance, jump start with
24 V). - If the overvoltage fault is logged in the fault
memory of only one control module, then the problem lies
with the power supply to this specific control module.

Fault effect and breakdown warning
Breakdown notice:
None
Possible apparent symptoms:
- none

Driver information
Warning light:
- ECE emissions warning lamp: on
- ECE electronic engine power reduction: on
- CC message: on
- US emissions warning lamp: off
- US electronic engine power reduction: off
- CC message: none

Service instruction
None