okay just got me 99 civic hatch with 98 gsr swap and its running on b16 ecu..so i went and got obd2b p72..plug it in and the will crank but wont start..only b16 ecu will start can anybody help?

 

security interupt maybe???

 

It is the immobolizer system in the Integra computer that's keeping the car from starting.

i think if you towed the car to an Acura or Honda dealership they could reset the immobilizer with an HDS scan tool.

Anyone esle want to clarify this?

 

I'm not sure about being able to reset the immobilizer, but I just thought I'd add that the integra fuel pump relay uses pin A15 while the civic uses pin A16.

 

yea b18c5-eh2 said it right, however dont go to honda, that will cost WAY too much. any auto-lock smith can take care of it for you. just had Doc-loc at my houes the other day, cost about 50$ for him to make a door key and reprogram the key for the p75 computer. 99-00

 

oh so the key have to be match with the p72 ecu in order to start?

 

Definitely immobilizer + fuel pump pins. You'll have to do both - swap pins A15 and A16 AND disable the immobilizer somehow.

I didn't think that you could have a key programmed to work in a civic with an OBD2b P72 because the civic doesn't have any way to read the chip in the key... an immobilizer equipped integra from what I've heard has an electronic reader that goes around the keyhole and reads whether the key matches the immobilizer. Since your civic doesn't have a keyreader, getting a key programmed won't help you.

If you're feeling adventurous, it is possible to remove the immobilizer from the ECU, which will cause a permanent P1607 CEL (internal ECU malfunction), but doesn't hurt anything or cause limp mode. The only other drawback of this method is that (for some reason) you HAVE to prime the fuel pump for 2 seconds every time or the car won't start. That's how I have mine right now. I've been driving with the P1607 since July, and it's running fine other than the light.

Or, H-T user Katman offers a service where he replaces the immobilizer with a dummy that gets rid of the CEL and the immobilizer. Last I looked, he charges $100 for that. If you live in an area with emissions testing, this will probably be your only legal solution.


I could be totally wrong about the keyreader thing, but I'm fairly certain that's the case, since there was never a 92-00 civic with an electronically chipped key.

 

That was always my impression too.

 

Thanks for the clairification Vindicator - that's why I said "think" and also asked for clarification.

I didn't even think about the ignition assembly not being set up in the 96-00 Civic to read an immobilizer key, etc. Great point.

I'd say the Katman option is the best option. He's a very respected guy in the honda/Hybrid community.

 

throw a ctr ecu in, im selling one :D

 

Another B series ecu (like CTR) will work, but you'll lose IABs. Which isn't a huge deal as long as you unhook them, but you'll have less torque below 5K.

 

will b16 ecu make any affect on my motor?

 

It'll run lean. If I were you i'd send your GS-R ECU to Katman and have him remove the immobilizer.

 

should i just go with obd2b to obd1 conversion harness and the the obd1 p72?

 

That will work, too!

 

Only if you don't need to pass yearly emissions inspections.

Why not just spend LESS money and keep it emissions legal by sending the ECU to Katman? 94EG8 has the right idea here...

 

You said that the gsr motor is a 98.....96-98 is obd2a.....and 99-01 is obd2b. Ecu doesnt plug up...or unless you are running the obd2b harness? And yes immobolizer might be the problem..try a conversion harness for obd2a and run the obd2a p72 since it doesn have an immobilizer

 

You COULD wire in a immobi sending unit with a key, then with Honda HDS software, go to "all keys lost", program the new key to the ecu, and now you have an extra starter kill

This is how I did my V6 swap in my Civic...running stock CL ecu

 

^^^^ That is another option if you know how to do it. I knew it was possible, but didn't know how to go about getting a key and getting the ECU reprogrammed without having to answer a million questions at the dealer.

 

yea 99 civic is a obd2b harness, best bet is to listen to B18C5-EH2 and just send it out

 

Yep.

That would be the way to go IMO. So far as I can tell Katman is currently charging $55 for immobilizer removal at the current time, which IMO is pretty reasonable.

 

I can install the Mobilizier Modul aswell. depending on the footprint on the ecu board. some can be done and some cannot. the modul cost about 45$ takes about 10min to install.

 

The OP is in texas...
Jump to an obd1 ecu, he doesnt have to deal with all the legalities.
this way he can tune in the future if he mods his motor. he can also keep re-using that ecu on different motors with just a chip swap.

Or, if your feeling crafty, you could desolder the ten pin IMMO board and install the modul yourself.