Idle Learn Procedure

When performing certain maintenance procedures, or when performing certain vehicle repairs, the idle learn procedure must be initiated. On a new or reset powertrain control module (PCM), the learned idle position is determined by the throttle position (TP) sensor value that is recognized when the ignition is first turned ON. The value is then retained in memory. A new value is automatically calculated by the PCM whenever there no idle learn value stored in memory. The idle learn procedure begins the learning of a new idle position when there is no old idle position value in the PCM memory. Performing the idle learn procedure is required for the following conditions:

• The throttle body assembly is replaced
• The throttle valve is cleaned-Deposits can build up in the throttle body requiring periodic cleaning of the throttle valve and throttle bore area. Refer to Throttle Body Service .
• The Clear DTCs function has been performed
• The PCM has been programmed.
• The PCM is replaced

If the PCM was replaced, proceed directly to the idle learn procedure. For the other actions above, the old learned idle position will be erased when the scan tool clear DTCs function is performed. Once the old learned idle position is erased, the idle learn procedure must be performed. Refer to Idle Learn .