Lambda Control Adaptation Rkat (Range Near Idle Speed) - Below Limit Value

P2190

Diagnosis information - DME

Lambda control adaptation RKAT (range near idle speed) - below limit value

NOTE:
- Diagnosis should indicate a negative deviation of more than 6% (weakening) of the lambda control adaptation in the range near idle speed.
- Opposed adaptation values in connection with misfires indicate that the timing is out of adjustment.

Diagnostic conditions
- Mass air flow < 32 kg/h
- Engine speed < 960 rpm
- Lambda control ahead of catalytic converter active
- Engine temperature> 55.5 °C (132 °F)
- No tank ventilation
- USA: Time after engine starts 250 ... 350 seconds
- RoW: Time after engine starts 302 ... 402 seconds
- No faults detected for oxygen sensor
- No faults detected for tank vent
- No faults detected for hot-film mass air flow sensor

Possible fault causes
- Hot-film mass air flow sensor faulty (displaced characteristic/soiled, e.g. due to faulty air cleaner/unfiltered air)
(setpoint voltage with stopped engine and ignition on = 0.9 ... 1.1 V
- see Actual values, Filter > Mass air flow [, ] Mass air flow sensor 1 (sensor) [ + for Turbo ] Mass air flow sensor 2 (sensor)< )
- Fuel pressure too high
- Mechanical fault of fuel injector (dripping)
- Tank vent faulty (does not close completely)