Originally Posted by Ridge
From what I gather in my reading, disconnecting the negative batter cable from the battery will accomplish step 2 Reset the PCM with the HDS so the HDS (Honda diagnostic system) won't be needed.
I'm not so sure about that because there are dozens of reasons for disconnecting the battery, and it would be surprising to find that the PCM is reset so easily.
The service manual states that the idle procedure be run whenever you replace, reset or update the PCM, or replace/clean the throttle body. No mention of just disconnecting the battery. In sections of the manual that require the battery be disconnected, there is mention of re-entering the radio codes, and re-arming the auto window, but nothing else.
The procedure for diagnosing the idle on your truck, to see if needs to be reset, is as follows:
1. Disconnect the EVAP canister purge valve connector.
2. Connect the HDS (this can probably be skipped)
3. Start the engine and hold the revs at 3000 in Park or Neutral until the radiator fan comes on, then let it idle.
4. Check the idle speed without
any load: headlights, blower fan, radiator fan and air conditioner off. It should be 730+/-50.
5. Let the engine idle for 1 minute with high electric load: headlights on main beam, AC set to max cool, blower fan on high. It should still be 730+/-50.
6. Reconnect the EVAP connector.
If the rpm's were out of scope, the learn procedure should be performed.