ECM/PCM Idle Learn Procedure

ECM Idle Learn Procedure

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

- Disconnect the battery.
- Replace the ECM or disconnect any of its connectors.
- Reset the ECM.

NOTE: Erasing DTCs with the HDS does not require the idle learn procedure to be done again.

- Remove the No.18 (7.5 A) fuse from the under-dash fuse/relay box.
- Remove the No.2 (80 A) fuse from the under-hood fuse/relay box.
- Remove the No.7 (15 A) fuse 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 connector (C103, C502) between the dashboard wire harness and engine wire harness.
- Disconnect the G1 terminal from the transmission housing.
- Adjust the idle speed.

Procedure

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 without load (in Park or neutral) until the radiator fan comes on, or the engine coolant temperature reaches 176 °F (80 °C) -221 °F (100 °C).
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, do not include its running time in the 5 minutes.