Automatic adaptation
Adaptation of ethanol content will take place if one of the following has occurred:
- Fuel volume has increased with ignition on, compared with the fuel level when the ignition was last switched off.
- Fuel volume increases when the vehicle has been stationary for more than 11/2 minute with ignition on.
- Fuel volume less than 8 litres and lambda control deviates more than +/- 10 %.
- If the previous ethanol adaptation was interrupted due to ignition shut-off before it was complete.
- Following loss of +30 to the ECM.
- Following the clearing of certain diagnostic trouble codes in the ECM.
Automatic ethanol adaptation can take place during both at idling speed and while driving. Following automatic adaptation the ECM must not be disconnected or in any other way be de-energised. Otherwise the adapted value will not be stored in the memory. Instead the previous value for ethanol adaptation will be used.
It is therefore very important that the engine is run until it is warm (however at least 5 minutes) following refuelling with another fuel, so that an adaptation is completed. Driving should be calm (lambda controlled). If consideration is not made of this a subsequent cold start could be difficult due to incorrect adaptation.