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ECM/PCM Idle Learn Procedure

The idle learn procedure must be done so the ECM/PCM can learn the engine idle characteristics.
Do the idle learn procedure whenever you do any of these actions:
  • Replace the ECM/PCM.
  • Reset the ECM/PCM.
  • Update the ECM/PCM.
  • Replace or clean the throttle body.
  • When the engine or transmission is disassembled.
NOTE: Clearing the DTCs with the HDS does not require you to do the idle learn procedure.
  1. Make sure all electrical items (A/C, audio, lights, etc.) are off.
  1. Reset the ECM/PCM with the HDS.
  1. Turn the ignition switch to ON (II), and wait 2 seconds.
  1. Start the engine. Hold the engine speed at 3,000 rpm (min −1 ) without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, or until the engine coolant temperature reaches 90 °C (194 °F).
  1. Let the engine idle for about 5 minutes with the throttle fully closed.
    NOTE: If the radiator fan comes on, do not include its running time in the 5 minutes.
  1. Verify on the HDS data list that the idle learn procedure is complete.