4DED
4DED - P0506Information saved in
DDE
Fault code
4DED - P0506
Fault text
DDE: Idle speed, plausibility: Actual idle speed too low
Fault description
Idle controller monitoring.
The diagnostic trouble code is logged when the engine's idle
rpm falls below a limit value. The limit value is calculated
from the lower specified engine rpm as defined according to
operating point and the offset value
HLSDem_nOfsMonMin_C. The minimum limit value is
300 1/min.
Condition for fault identification
Test condition:
The test routine runs when the following conditions are
satisfied:
The idle controller is active.
The vehicle's speed must exceed 1 km/h.
The idle controller is the only station requesting torque
generation.
The idle controller is requesting torque lower than the limit
value 0.
The engine rpm exceeds the limit value 300 1/min.
The check runs continuously in a 100 ms grid.
Voltage condition:
The test routine runs when the following conditions are
satisfied:
The idle controller is active.
The vehicle's speed must exceed 1 km/h.
The idle controller is the only station requesting torque
generation.
The idle controller is requesting torque lower than the limit
value 0.
The engine rpm exceeds the limit value 300 1/min.
The check runs continuously in a 100 ms grid.
Condition for fault memory entry
Debounce (3000 ms)
Action in service
-
Fault effect and breakdown warning
-
Driver information
Warning light:
MIL
Service instruction
none