ECM/PCM Idle Learn Procedure

ECM Idle Learn Procedure

The idle learn procedure must be done so the ECM can learn the engine idle characteristics.

Do the idle learn procedure whenever you do any of these actions:

- Replace the ECM
- Reset the ECM
- Update the ECM
- Replace or clean the throttle body
- Disassemble the engine or the transmission

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

Procedure

1. Make sure all electrical items (the A/C, the audio system, the lights, etc.) are off.

2. Reset the ECM with the HDS.

3. Turn the ignition switch to ON (II), and wait 2 seconds.

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

5. 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.