P1515
4DFB - P1515Information saved in
DDE
Fault code
4DFB - P1515
Fault text
DDE: Engine switch-off time: Engine switch-off time
determination faulty
Fault description
The engine downtime is the period between the last time the
engine was shut down and the most recent engine start.
The engine downtime monitoring function is implemented
in two versions:
1. The system determines whether the count for the relative
time received in the CAN bus advances correctly. This
process compares the relative time with a software timer
within the ECU.
The diagnostic trouble code is logged when the time
differential is greater than 8 s.
2. The engine downtime continuously monitored during the
current driving cycle is written to the EEPROM (from
engine downtime until deactivation of the main relay). This
time is read from the EEPROM when the next driving cycle
is initialized. The diagnostic trouble code is logged when
this time is greater than the currently determined engine
downtime.
This fault can occur when the instrument cluster's second
counter has been interrupted. This scenario can arise when
worked has been performed on the instrument cluster (reset,
flash-programming, power supply deactivated...).
Condition for fault identification
Test condition:
The monitoring function is executed only when:
The relative time received on the CAN bus is greater than
the threshold EngDa_ctrEngOffMon.
The software timer may not exceed the overrun of 248 days
with the first version of the monitoring function.
With the second version the monitoring function the relative
time must have exceeded the limit value 604800 s to avoid
incorrect diagnosis when the battery is disconnected.
Voltage condition:
The monitoring function is executed only when:
The relative time received on the CAN bus is greater than
the threshold EngDa_ctrEngOffMon.
The software timer may not exceed the overrun of 248 days
with the first version of the monitoring function.
With the second version the monitoring function the relative
time must have exceeded the limit value 604800 s to avoid
incorrect diagnosis when the battery is disconnected.
Condition for fault memory entry
Debounce (500 ms)
Action in service
Start vehicle, switch it off, allow vehicle to enter sleep mode
(can take up to 15 min), these steps must be carried out
before the diagnostic trouble code can be deleted.
If the fault continues to appear respond by replacing the
instrumkent cluster.
Fault effect and breakdown warning
No hazard to components is present
Proceed to the nearest BMW Service facility.
Driver information
Warning light:
MIL
Service instruction
none