Throttle Body Relearn Procedure

The engine control module (ECM) stores values that include the lowest possible throttle position (TP) sensor positions-XX percent, the rest positions-XX percent, and the return rate of both springs. These values will only be erased or overwritten if the ECM is reprogrammed or if a throttle body relearn procedure is performed. Observe, if the battery is disconnected, the ECM will immediately perform a throttle body relearn procedure when the ignition is turned ON.

A throttle body relearn procedure is performed anytime the ignition is turned ON, with the engine OFF for longer than XX seconds when the following conditions have been met:

• The engine speed is less than XX RPM.
• The vehicle speed is XX km/h (XX mph).
• The engine coolant temperature (ECT) is between XX°C (XX°F).
• The intake air temperature (IAT) is between XX°C (XX°F).
• The accelerator pedal position (APP) sensor angle is less than XX percent.
• The ignition 1 voltage is more than XX volts.

After XX seconds, the ECM commands the throttle plate from the rest position to full closed, then to around XX percent open. This procedure takes about XX seconds. If any faults occur in the throttle actuator control (TAC) system, a DTC sets.