integra15

If the ECU is replaced on a SH prelude, do you have to purchase new keys due to the immobilizer system? Or is the immobilizer system separate from the ECU?

No guesses please, I need to know for sure before I spend the money on a new ECU. Thanks

integra15

Well I found my answer in the manual. Page 23-198 says all 3 items, the key, control unit , and ECU must have the same codes

xero_xero

you can in fact remove the immobilizer board. above it is the rectangular board protruding from your ecu. fold it back and forth till it brakes off (or desolder it), it will throw immo code P1607

here is the help thread to another prelude owner.

immobilizer cars are an ECU/ Keyd pair.

97'SilverBullet01H22

Tried it, there is only one circuit board that looks similar in my 01 prelude ecu to the picture. Ripped it off and still no go.

If only it was that easy to steal honda cars.

Katman

US 97-01 preludes are immune to this chip removal trick. This only works for US 00-01 integra ecu's, yet you will still have a constant CEL on.

And btw, that's not a US prelude ecu's IMMO board shown in that photo. 97-01 preludes have a 10-pin IMMO board, not 12.

Prelude ecu's need a replacement IMMO chip in order to bypass. Hit me up if you need this service

THC07

I need this service.
Ive yet to see a hack for the p5m's.
A0 an FX01 are all thats avaliable to date right?
did they recently make one for the p5m, p5j?

xero_xero

That is an Accord V6 ecu.

the same immobilizer is on Integras, Accord V6, RSX and i am betting anything else with the K, J, Or B series Motor with immobilizers.

Now the only way to bypass or disable the immobilizer on the ecu is to solder in a dummy chip that does not recognize the conector and bypass the immobilizer control unit. If you only remove the ecu OR immobilizer control unit then it will disable the injectors and ignition.

replacing the ECU AND removing the immobilizer control unit is the best way to bypass the immobilizer. once you remove the Chip (it will look verry similar to the pic above) you must remove the immobilizer control unit

**Below is that to do if you have lost your immobilizer enabled key on 5th gen Preludes**

You will need to retrieve the immobilizer control unit from under the dash and take it to your local Honda dealer. They will read the serial number and give you the brake code that will disable the immobilizer until 10 minutes after you turn the car off.

Insert key and turn to the II/ON position. Enter the first digit of the code (you will be entering the code via the brake pedal ( if the digit is a 5 then you will press the pedal 5 times)) then turn the key to the OFF position then turn the key back to the II/ON position and enter in the second digit. Repeat until you've entered the 5th digit, taking no more than 30 seconds per digit. At this point, the immobilizer light should blink 5 times. Once this happens, you can start the car, and drive. If you shut off the car, you have 10 minutes to re-start the car before you have to re-enter the brake code.

I know some immobilizer control units require the code to be entered by the ebrake. this is not the exact answer your looking for which i know.

Katman

Hit me up
Yes A0/FX01 are all that are available to date.
I have aftermarket FX01 boards that totally works fine on P5M/P5P/P5J ecu's; bypasses the IMMO system, no constant CEL, and is OBD2 scanner tool friendly.

THC07

OMG really?
this is the best news I have heard ALL year.
PM'd

jmb99accord

Would it be possible to desolder the immo chip out of your original computer and solder it into the new computer you are using?

Katman

nope. tried it and it doesnt work.

jlude90

That makes no sense. How does the original work then?

And if you can read a wiring diagram, the immobilizer takes about 15 seconds to bypass.

DERICER

I know its an old post katman , but i need help with a00 p75 ecu
Need a dummie chip if u have one let me know

hectorgsr88

hey katman send me info i need my ecu dummy chiped asap..thanks!

andoxviii

iTrader: (1)

Just buy an OBD1 ECU and a conversion harness.

Katman

Theoretically it sounds like it would work but swapping the chip just doesn't work. Not sure why.


PM'd.

DIY_for_life

Hey Katman, can you still get the bypass for HIC-FX01? (98 honda accord 4cilynder vtec)

I'd gladly buy one.

Katman

super late reply lol........but yesh I sure can

iakona

doesn't work where OBDII is part of the smog scan and part of the referee legalization process for those states that require it.

hondaprofessor

tight work

TwinCam MS

Hey Katman, can you still get the bypass for HIC-FX01? (00 GSR P72-A05)

I'd gladly buy one too!

PM'd you

r0ckstar

I also need this service for a 98 prelude type S

Speedindemon

recently had keys stolen in a attempted car theft..luckily was on vacation and had my car disable sadly the person kept my only master key. and i never had a learner key to rekey a replacement. would this immobilizer removal work. for just using a non transponder matched key.

nemesis25

Might wanna consider this:

http://www.ebay.com/itm/Honda-Prelude-P5M-ECU-without-immobilizer-manual-transmission-1997-2001-/191542197038?hash=item2c98cdfb2e&vxp=mtr

94dxcoupe

HA Motorsports offers immobilizer removal on P5M ECU's:

Honda / Acura ECU Immobilizer Removal Service | HA Motorsports

Should be all that is needed. If you just rip the board off the ECU the car still won't start on Prelude's.