ME9 / P0300 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)
(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
Fault indicator lamp (for further information see WIS Fault diagnosis, general)
(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). |
| • | Fuel level at least 12%. |
| • | Intake air temperature is above -30°C. |
| • | P0318 must not be detected. |
| • | Total number of combustion signals registered. |
| • | Number of missing combustion signals is accumulated per cylinder. The total number of permissible misfires is specified in a load and speed-dependent matrix. |
Fault criteria:
| • | Combusions affecting emissions detected. |
| • | Misfires that could damage the catalytic converter detected. |
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 |
| • | Fuel balancing Cylinders 1 - 6 |
| (See also description of readings/activations in diagnostic tool) |
