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:

- The ECM/PCM is replaced.
- The ECM/PCM is reset.
  NOTE: Erasing DTCs with the HDS does not require you to do the idle learn procedure.
- The throttle body is replaced.
- The throttle body is cleaned.

Procedure

1. Make sure all electrical items (A/C, audio, rear window defogger, lights, etc.) are off.

1. Reset the ECM/PCM with the HDS.

1. Turn the ignition switch ON (II), and wait for 2 seconds.

1. Start the engine. Hold the engine speed at 3,000 rpm (min −1 ) without load (in Park or neutral) until the radiator fan comes on, or until the engine coolant temperature reaches 90 °C (194 °F).

1. Let the engine idle 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.