E39 / P0300 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE
(Check Engine lamp flashes if diagnostics has detected a misfire that is harmful to the catalytic converter).
Uneven running and misfiring.
Random Misfire Detected.
Fault symptom
CHECK ENGINE
(Check Engine lamp flashes if diagnostics has detected a misfire that is harmful to the catalytic converter).
Uneven running and misfiring.
On-board diagnosis
Type of diagnosis:
| Each misfire is registered and evaluated two different ways depending on the type of misfire. |
| • | Harmful to the catalytic converter. |
Enable criteria:
| General conditions for this DTC |
| • | Positive engine torque (negative torque = engine braking). |
| • | Engine temperature above -7°C. |
| The following diagnostic trouble codes may not be generated: |
| P0010, P0011, P0013, P0014 |
| P0111, P0112, P0113, P0114 |
| P0122, P0123, P0222, P0223 |
| P0116, P0117, P0118, P0119 |
Fault criteria:
| The control module has detected a too large variation in the crankshaft's rotation speed. |
Diagnostic help
Diagnosis regards:
| Fuel/air mixture too rich or too lean, insufficient compression, poor spark plugs causing incomplete combustion. |
| A cursory check is carried out on connectors and hoses. Then a through check is carried out on compression, ignition timing and fuel system. |
Functions in the diagnostic tool related to the fault:
| • | Airmass Deviation from Calculated |
| Requested Fuel Rail Pressure |
| (See also description of readings/activations in diagnostic tool) |
