This harness was modified to work with an H22A engine. However, I have plugged in my Prelude P72-A02 ecu and the car does not start. Can anyone tell me what the purpose of these jumped pins are?







I'm assuming the P72 isn't working because of the immobilizer. Waiting on an OBD2A-OBD1 jumper harness so I can run a chipped p28. However, should I get an unmolested EK harness? I don't know what these jumpers are for.

The engine turns over, fires once, then dies.

 

a p72 is not a prelude ecu.

 

Spoke with HAmotorsports and turns out the P72-A02 does NOT have an immobilizer.


Getting fuel, getting air.... something is up with the spark. Distributor cap is correct, correct resistance on wires. Should I pull the plugs?

 

TO repeat what the first man said, the P72 is a B-series ECU. Why are you using it? The first thing I would do is get the pinouts for that ECU and see what those splices are all about. Also, at least one of your wires looks a little chewed up to me.

 

I have no idea what those jumpers are for, but there are a few things that you should tell.

1) What car is this on/in?
2) The modified harness your asking about is from what car and modified how?


I did a little google search and found out that your p72 (integra) ECU will run a H22, but lean, and it can trigger knock sensor codes due to that issue. But the only way to know is to find out what those jumpers are run to is to check the ECU pinout found http://www.bing.com/images/search?q=...gram&FORM=IGRE or using a google search for "P72 ECU pin out" and depending on what those pins are for and hoping no one has repined them you can trace the wires and find out.

No one/very few should be able to tell you what they are for due to the lack of information given.

 

The problems I have found with H series and them Starting, then immediately dying are either the Crank/ TDC sensor, or the wrong crank timing gear and/or balance shaft gear on the crank are wrong.

At least, with OBD2

 

Actually, you figured it out, 420eg95. It's an EK Civic with an H22A swap, running a P72-A02 ECU. It was all in the first post, HT just lacks reading comprehension.

Thanks for the correct search terms, turns out its a CKF Bypass, as seen here:
http://technet.ff-squad.com/ckftrick.htm

Thanks to your help, I now know that the P72 is indeed correct for the H22A. The d16y8 has extended leads for the alternator, and the jumpers are for the CKF bypass.

Now I just have to figure out why it isn't running.

 

My apologizes for not seeing that last line under the pics, but glad you figured it out.

 

I'm starting to lean towards this... but this engine is such a PITA to install/remove. There is no room between frame rail and timing cover.

Damn SIR S Spec H22A....

 

Not if it runs it lean it isn't.

 

Running slightly lean is better than not running at all. I have a chipped p28 waiting to go in. Just not gonna risk frying the good ecu while I get it running.

Still trying to figure out where the crank position sensor is.

 

No, the P72 is not the correct ECU for the H22A. The correct ECU for the H22A is the P0F. Good luck getting one, though. Alternatively, you could use a P13, which would also be the "correct" ECU for that motor.

 

WTF has this scene gone to.........p72 running an h22 is not correct. You're h22 ek not starting is other issues. If that harness hacked up by someone other than yourself than I suggest you find another unmodified engine harness and modify it yourself, that way if you need to reverse anything you'll know what to look for.


edit: for the record, that ecu looks like its seen some days.

 

P72 is working just fine. It's throwing a cel due to the engine being jdm and not playing well with usdm obd2 ecu.

Armchair general all you want. I'll be in the garage mending while y'all sit around discussing the finer points of beating a dead horse.

Checked timing.
Checked spark.
Changed plugs just in case.

Discovered plug #1 was dry as a bone. Pulled injector one, hit it with air and WD40(all I had at the time). Reinstalled, runs, does not rev past 2k.
Re routed vent hose into cai. Runs great now.
Still need to bleed radiator, then flush oil and refill with T6.

 

Contradict much?

 

p72 is for a 1.8 liter, you're running lean. What yr is this h22?

Edit: don't come in here and kid us, rerouting an air house won't get you to rev past 2krpm. A vac leak doesn't keep any car from revving past 2k

 

OP -- You came to this forum asking for help and then you proceed to insult members who ask reasonable questions and who are attempting to guide you to a solution.

You'll benefit by reading more threads than you create.

/thread