Pcm Idle Learn Procedure: Procedure

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

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

• Replace the PCM.
• Reset the PCM.
• Update the 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.
• The PCM memorizes the learning status in its memory after passed an hour from turning the vehicle to the OFF (LOCK) mode. If you need to disconnect the 12 volt battery terminals before memorizing the learning status in the PCM, jump the SCS line with the HDS, and wait 60 seconds, then disconnect the 12 volt battery terminals.

1. PCM Idle - Learn

   Procedure 

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

   2. Reset the PCM with the HDS 

   3. Turn the vehicle to the ON mode, and wait 2 seconds.

   4. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) 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.

   6. Verify that the idle learn indicates COMPLETED in the HDS PGM-FI data list.

   7. Turn the vehicle to the OFF (LOCK) mode.

   8. Jump the SCS line with the HDS.

   9. Wait 60 seconds, and exit the SCS mode with the HDS.