BMW 328i Sedan (E90) L6-3.0L (N51) P code charts 20
Test condition:
RAM checksum test
This test is executed once, while the control module is
booting.
Terminal condition: Immediately after wakeup in dormant
control module
Voltage condition:
none
Condition for fault memory entry
No debounce. Fault can be reset by clearing fault memory.
Action in service
Start by checking ground connections on the ignition coils.
If these are OK, proceed with the following steps.
Check to determine whether the diagnostic fault code is
stored again after proceeding through the following routine.
If yes: Replace DME.
1. Clear fault memory
2. Ignition off, allow vehicle to assume complete dormant
status
3. Ignition on
4. Read out stored fault codes from fault memory
Fault effect and breakdown warning
Driver information
Warning light:
none
Service instruction
none
P16A4
2AB5 - P16A4
Information saved in
DME
Fault code
2AB5 - P16A4
Fault text
DME, internal fault: knock-sensor module
Fault description
Timeout Control Module Knock Sensor SPI-Bus
Condition for fault identification
Test condition:
Monitoring of knock sensor chip
Engine speed >320 rpm
Terminal condition: Terminal 15, engine on
Voltage condition:
none
Condition for fault memory entry
Yes, by event counter. Fault must occur ten times before a
fault memory entry is made.
Action in service
Determine whether fault is stored again after carrying out
the following procedure. If yes: Replace DME.
1. Clear fault memory
2. Ignition off, allow vehicle to assume complete dormant
status
3. Ignition on
4. Read out stored fault codes from fault memory
