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.
NOTE:
Clearing the DTCs with the HDS does not require you to do the idle learn procedure.
Procedure
- Make sure all electrical items (A/C, audio, lights, etc.) are off.
- Reset the ECM/PCM with the HDS.
- Turn the ignition switch ON (II), and wait 2 seconds.
- 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).
- 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.