ECM/PCM Idle Learn Procedure

The idle learn procedure must be done so that the ECM/PCM can learn the engine idle characteristics.
Do the idle learn procedure whenever you do any of these actions:

  • Disconnect the battery.
  • Replace the ECM/PCM or disconnect its connector.
  • Reset the ECM/PCM.

    NOTE: Erasing DTCs with HDS does require the idle learn procedure to be done again.

  • Remove the No. 14 (15A) fuse from the under-dash fuse/relay box.
  • Remove the No. 1 (80A) and No. 6 (40A) fuses from the under-hood fuse/relay box.
  • Remove the PGM-FI main relay.
  • Remove the battery wire from the under-hood fuse/relay box.
  • Disconnect any of the connectors from the under-hood fuse/relay box.
  • Disconnect the G1 terminal from the transmission housing.
  • Adjust the idle speed.

To complete the idle learn procedure do this:

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

2.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 the engine coolant temperature reaches 80°C (176°F) -100°C (221°F).

3.Let the engine idle for about 5 minutes with the throttle fully closed and with all electrical items off.

NOTE: If the radiator fan comes on during this step, the time when it is operating must not be included in the 5 minutes.