ECM/PCM Idle Learn Procedure

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:

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

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

- Remove the No.6 ECU (ECM/PCM) (15 A) fuse from the under-hood fuse/relay box.
- Remove the No.19 battery (80 A) fuse from the under-hood fuse/relay box.
- Remove PGM-FI main relay 1.
- Remove any of the wires from the under-hood fuse/relay box
- Disconnect any of the connectors from the under-hood fuse/relay box.
- Disconnect the connector between the engine compartment wire harness and ECM/PCM wire harness.
- Disconnect the G2 terminal from the transmission housing.
- Disconnect the G1 terminal from the body.
- Disconnect the G101 terminal from the water passage.

To complete the idle learn procedure, do this:

1. NOTE: If the radiator fan comes on, do not include its running time in the 5 minutes.
2. Start the engine, and hold it at 3,000 rpm with no load (in park or neutral) until the radiator fan comes on, or until the engine coolant temperature reaches 194 °F (90 °C).
3. 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.