P1069

P1069

Diagnosis information - Control unit DME (DFI)

Mass air flow implausible too high (Leakage adaptation)

Diagnostic conditions
- Idle speed > 2 Minute(s)
- Trip with different operating conditions
- none of the following faults stored : Intake manifold pressure sensor, Throttle adjusting unit, Ambient pressure sensor, Intake air temperature sensor, Speed sensor, Valve lift control, Camshaft adjustment, Intake pipe switchover

Possible fault causes
- Oil filler cap leaks
- Positive crankcase ventilation hose leaks (See [Information] 1)
- Intake system leaks - between Throttle valve and Engine (Intake valve)
- Tank vent Faulty - Closed
- Intake manifold pressure sensor - Electrical plug connection loose, oxidized, corroded, interrupted
- Fault in area Intake manifold pressure sensor, Throttle adjusting unit, Ambient pressure sensor, Intake air temperature sensor, Speed sensor, Valve lift control, Camshaft adjustment, Intake pipe switchover

Fault setting condition(s)
- Impermissibly large deviation of the measured air mass from the calculated air mass. , at:
- Increasing deviation over an extended period (See [Information] 2)

INFORMATION
1. - only Turbo
The following components are NOT tested during an overpressure test of the intake duct:
- Check valve for ventilation (Intake distributor distributor)
- Check valve for ventilation (Suction hose Turbocharger)
- Positive crankcase ventilation hose between Check valve for ventilation and Crankcase
- Crankcase

2. In this diagnosis, the intake system between the throttle valve and the engine (intake valves) is monitored.
- A mass air flow is calculated from the signals from the throttle potentiometer, engine speed sensor, intake air temperature sensor and ambient pressure sensor as well as other engine operating values.
- The calculated mass air flow is compared with that measured by the pressure sensor.
- A deviation may be due to both the calculated mass air flow and the measured mass air flow.