ME9 / P0101 00
Read the instructions below then
start the fault diagnostic procedure.
Mass Air Flowsensor, Performace Problem (Deviation from Calculated Mass Air)
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Battery voltage must be between 10 - 18 V. |
| NONE of the following DTCs must be detected: |
Fault criteria:
| Incorrect air mass in relation to throttle position for more than 2 seconds. |
OK report:
| Fault criteria NOT fulfilled. |
Fault handling:
| (See section Fault handling III, "Other emission-related components and functions" for more information.) |
Checking the wiring harness
Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.
Diagnostic help
Diagnosis regards:
| The DTC indicates that the value from the mass air flow sensor has been deemed unreliable after comparison with a calculated value. This could be due to an air leak or a faulty mass air flow sensor. |
| A crankcase ventilation leak may be one reason as to why a DTC is set. Check crankcase ventilation function before starting regular troubleshooting. |
Functions in the diagnostic tool related to the fault:
| • | Requested Throttle Position |
| (See section Fault handling III, "Other emission-related components and functions" for more information.) |
