ECM/PCM Idle Learn Procedure

PCM Idle Learn Procedure

The PCM actively learns the idle characteristics whenever the engine is idling. The idle learn procedure must be done to ensure the PCM learns the engine idle characteristics.

Do the idle learn procedure whenever you do any of these actions:
- The PCM is replaced (especially before testing).
- The PCM is reset.
- The PCM is updated.

NOTE: Erasing DTCs with the HDS does not require you to do the idle learn procedure.

- The throttle body is replaced or cleaned.

Procedure

1. Make sure all electrical items (A/C, audio, rear window defogger, lights, etc.) are off.
2. Reset the PCM with the HDS.
3. Turn the ignition switch ON (II), and wait 2 seconds.
4. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, or until the engine coolant temperature reaches 194 °F (90 °C).
5. 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.