Incorrect adaptation

Under certain conditions the current adapted ethanol value may be incorrect. Examples of instances that result in an incorrect ethanol value:

Fig 1: Diagnosis For Incorrect Adaptation

Courtesy of SAAB-SCANIA OF AMERICA, INC.

• Component fault: mass air flow sensor, oxygen sensor 1, fuel pump, fuel pressure regulator and fuel level sensor.
• Air leakage in the induction system.
• Voltage drop (+30) before writing to ROM memory takes place.
• Hard driving after refuelling with another fuel, (driving outside lambda controlled range).
• Short driving distance after refuelling with another fuel (cold engine or driving time under 5 minutes).
• SPS programming without entering the current ethanol content.
• Changing fuel in connection with pump replacement for example, (draining 30 litres of E85 that is replaced by 30 litres of petrol).