Don't you just love the German error messages....
This little pretty popped up while I was goofing around trying to get DIS connecting to my '5 (which could be a whole 'nother thread by itself - and may yet be one...) and I was checking INPA operation after changing some OBD/EDIABAS settings.
The error and error data translate as: -
4501 Exhaust Gas Recirculation
Negative control deviation / air mass too high
Test conditions not yet fulfilled
Error not yet occurred
Error would cause a warning lamp to light up
Error in debouncing phase
Normally I would be diving in to check the EGR and all the vacuum lines and vacuum modulators (and I'll probably go over them soon) but in this case I'm pretty sure that this error will be related to the growing exhaust manifold crack(s) I have. I'm still waiting on parts from Latvia so haven't sorted it yet.
While I have things apart, I'll be cleaning out the EGR - I had planned to do that before I got these codes - and will attend to any frayed vacuum hoses etc, check the vacuum operation of the EGR and I'll even clean out the little filters in the vacuum modulators.
A full error description reads: -
4501 - P0401
Information saved in
DDE
Fault code
4501 - P0401
Fault text
DDE: Exhaust-gas recirculation, control deviation: Air mass
too high/negative control deviation
Fault description
The diagnostic trouble code is logged in the ECU when the
exhaust-gas recirculation system's negative control deviation
falls below a limit defined based on the operating point.
Condition for fault identification
Test condition:
The test runs every 20 ms when the exhaust-gas
recirculation control system is activated, the monitoring
system is enabled and no other system fault is present.
Voltage condition:
The test runs every 20 ms when the exhaust-gas
recirculation control system is activated, the monitoring
system is enabled and no other system fault is present.
Condition for fault memory entry
Debounce (7500 ms)
Action in service
Check the following potential problem sources:
Leaks in mass airflow system on engine side of compressor
Leaks in exhaust system on engine side of turbine (combined with mass airflow plausibility errors).
Throttle valve defect (in combination with throttle valve faults).
Defective EGR valve (in combination with EGR valve errors).
Defective turbocharger (in combination with turbocharger faults).
Severe EGR cooler soot accumulation. Applies to engines with single-stage boost: Conduct mass
airflow system test.
Fault effect and breakdown warning
It is possible to continue driving the vehicle, emissions deteriorate.
Proceed to the nearest BMW Service facility.
Driver information
Warning light:
MIL
Service instruction
Note collateral effects on boost-pressure control (faults in
the exhaust-gas recirculation system can affect the boost-
pressure control system).
Check diagnostic trouble codes for the named components.
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