P2188

P2188

Diagnosis information - DME

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

NOTE:
- Diagnosis should indicate a positive deviation of more than 6% (enrichment) 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 airflow < 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 airflow 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 airflow], [Mass airflow sensor 1 (sensor)] + for Turbo [Mass air flow sensor 2 (sensor)] )

- Oil filler cap leaking (secondary air)
- Intake system leaking (secondary air)
- Positive crankcase ventilation leaking (secondary air)
- Crankcase leaking (secondary air, e.g. through sealing ring fitted skew)
- Leak in exhaust system
- Tank vent faulty (does not close completely)