2F77 – P321F (DME)
2F77 – P321F
Information saved in
DME
Fault code
2F77 – P321F
Fault text
Ambient-pressure sensor, plausibility
Fault description
Ambient Pressure Sensor Minimum Pressure Implausible
Condition for fault identification
Test condition:
Ambient pressure sensor monitor
Terminal condition: Terminal 15 ON
Voltage condition:
Voltage in onboard electrical system > 10 V
Condition for fault memory entry
Because an excessively steep ambient pressure gradient
must be detected, no precise statements regarding debounce
time are possible.
Action in service
1) Plausibility check on barometric pressure (data range and
sensor travel during mountain ascent and descent)
2) Replace DME only if barometric pressure data are
implausible (internal component)
Fault effect and breakdown warning
Driver information
Warning light:
MIL ON in US versions only
