Quantcast
reprogramming ECU on Hondas - Beyond.ca - Car Forums
Results 1 to 8 of 8

Thread: reprogramming ECU on Hondas

  1. #1
    Join Date
    Jul 2002
    Posts
    18
    Rep Power
    0

    Default reprogramming ECU on Hondas

    I found this on a web site :

    Why reset your ECM (Engine Control Module)?

    Well after modifying the engine,adding bolt on's such as headers or intake,ect, the computer will need to adjust to the change that is why you may want to reset the computer..

    ...This being since Honda uses a MAP (Manifold Absolute Pressure) sensor to estimate air flow . The problem with this is that the stock ECU does not compensate for increased flow caused by intake or exhaust upgrades. The stock ECU uses fixed maps programmed into the computer to dictate the air fuel mixture. So an increase in air could cause the engine to run lean and thus it is not giving you the performance you hoped and paid for.

    So once you start modding your car, this is what you do, it is suggested that the car is warmed up.

    From the service manual.

    1. Warm up car, until fan kicks on, shut off car.
    2. Pull out BACKUP fuse from the under hood main fuse box (number 11 in diagram below).
    3. Wait 5 minutes.
    4. Put fuse back in.
    5. Start car, make sure all accesories are off, DO NOT touch gas or brake.
    6. Let run 10 minutes, then shut off and start again.
    7. Your done.
    8. Reset any accesories affected by the power loss, don't forget your alarm might yell at you for this and if you have a factory deck you will need the passcode.


    What do you think????

  2. #2
    Join Date
    Jun 2002
    Location
    N 51 02.10' W 114 01.10'
    My Ride
    1989 black one
    Posts
    40
    Rep Power
    0

    Default

    But it's still using the fixed maps.....

  3. #3
    Join Date
    May 2002
    Location
    a van down by the river
    My Ride
    Bmw and ford
    Posts
    2,252
    Rep Power
    27

    Default

    you do not need to warm up the car first but other then that it is a little off but not that far.

  4. #4
    Join Date
    Jun 2002
    Location
    Calgary
    My Ride
    2008 Z06
    Posts
    3,591
    Rep Power
    41

    Default

    According to the Service manual the ECU reset procedure is the following for a 2nd gen Integra:

    ECU Reset procedure. (Perform every time when troubleshooting)
    1. Turn the ignition switch off.
    2. Remove the BACK UP fuse (7.5A) from the under-hood fuse box for 10 seconds to reset ECU.
    CANADA: Remove the HAZARD, BACK UP fuse (10A) from the under-hood fuse box for 10 seconds to reset ECU.

    (The following is not found anywhere in the service manual, but makes sense, so I follow it.)
    Now when starting the car, let the car idle for 5-7 minutes with all accessories off and don't press the accelerator at all. Let the car warm up to normal operating temperature before pressing the accelerator. REMEMBER DON'T PRESS ON THE GAS PEDAL UNTIL IT HAS WARMED UP FOR 5-7 MINUTES. When the car has warmed up for 5-7 minutes turn the ignition off. ECU has been successfully reset.
    Current Cars:
    2019 BMW X3 M40i Stage 2, 12.44 at 110mph
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2004 GMC 2500HD 8.1L

    Past Cars:
    1970 Chevy Blazer, 2wd
    2003 BMW X5 4.6IS Doushmobile, moneypit
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108mph
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  5. #5
    Join Date
    May 2002
    Location
    a van down by the river
    My Ride
    Bmw and ford
    Posts
    2,252
    Rep Power
    27

    Default

    the whole going lean put is but other then that...

  6. #6
    Join Date
    May 2002
    Location
    Calgary
    My Ride
    957,958,NC1,NC3,E90,ITR
    Posts
    5,224
    Rep Power
    48

    Default

    I got a switch wired to one of the fuses that does that.

  7. #7
    Join Date
    Jul 2002
    Posts
    18
    Rep Power
    0

    Default

    Mortimer, I think it would still used fixed maps, but they would be ajusted to your current car condition when you reset the ECM.


    From what I read on the post I am understanding that it is a good idea to reset the ECM after having done a few modifications.

    Anybody has done it and noticed a difference?
    I will try this weekend and post hereif I notice something.

    Some of you said what I posted was off a little bit, can you tell me what is off so I can do it properly?

    Thanks

  8. #8
    Join Date
    Jul 2002
    Location
    Calgary
    My Ride
    E90 335i
    Posts
    668
    Rep Power
    22

    Default

    After I got my intake I did it, I think the only difference I noticed was in my head!
    George likes his Kung Pao spicy!

Similar Threads

  1. P28 Ecu

    By GreenLude in forum Automotive Parts [Engine Electronics]
    Replies: 4
    Latest Threads: 10-17-2002, 06:46 PM
  2. Fs: P28 Ecu

    By buh_buh in forum Automotive Parts [Engine Electronics]
    Replies: 4
    Latest Threads: 09-27-2002, 12:54 AM
  3. ECU locations

    By LUDELVR in forum Mechanical
    Replies: 2
    Latest Threads: 09-16-2002, 10:10 PM
  4. WTB obdI ecu

    By buh_buh in forum Automotive Parts [Engine Electronics]
    Replies: 19
    Latest Threads: 08-29-2002, 11:00 AM
  5. Where have all the hondas gone?

    By 4wheeldrift in forum Events and Meets
    Replies: 8
    Latest Threads: 07-29-2002, 05:31 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •