Adaptive Strategy

Adaptive strategy has been added the the EEC-IV system. This feature continually adjusts the calibration strategy to correct for wear and aging calibration components. The adaptive strategy then retains the adjustments in the keep alive memory (KAM) so they will not be lost (cancelled) when the ignition switch is turned OFF. A short adjustment period will occur: one new vehicles, when the battery has been disconnected during normal service, when the electronic control assembly (ECA) is disconnected or replaced and when a component of the EEC-IV system is replaced.
If an EEC component is replaced (due to age or damage), the memory may need to be cleared to eliminate the adjustments that were made to correct the replaced component. It is possible for the engine operation to actually deteriorate because the new component will be controlled as if it were still the replaced aged or damaged component.
During the adjustment or learning period (usually under 5 miles of driving) some vehicles could exhibit abnormal drive symptoms (surge, hesitation and high idle speeds).

Calibration Application Chart:

High idle speed, stalling or other driveability symptoms may still be present after a defective component has been replaced. This may mean that the adaptive Strategy must be reset in the EEC-IV processor. The procedure to reset Adaptive Idle Speed Control is as follows:
1. Disconnect battery for 10-15 minutes.
2. Reconnect battery, start engine and bring to normal operating temperature (upper radiator hose hot and pressurized).
3. Set parking brake and place foot on service brake.
4. Place transmission in Drive (ATX) or Neutral (MTX), steering in the "straight ahead" position.
5. Place all accessories in the Off position. A/C Off and the mode selector lever, located on A/C panel, set in the "floor" position.
6. When the engine RPM reaches the Adaptive Idle Speed (refer to the following application chart), let the engine idle for 2 minutes.
NOTE:The vehicle can be driven to check for customer concerns. This will start the learning process for Adaptive Fuel Control.