How Do I Know...OBD?

[bambam89lx]

In my opinion, OBD0 is "better" when it comes to swapping engines. I think it is better for two reasons.
1. It is alot easier to figure out why there is a check engine light on by counting the blinks on ur ECU
2. It is a hell of alot easier to swap an engine to an OBD0 vehicle due to less sensors and plugs therefore less wiring and it is alot easier to understand what those sensors do and which plugs go to them.

OBD1 has it's advantages also
1. As crxlvr said, obd1 and obd2 are better when it comes to figuring out what's up with ur car and making ur CEL (Check Engine Light) go away. But, you must own the scanner tool to do this.

2. Engines using OBD1 and 2 generally run cleaner by utilizing the extra sensors to control your emissions.

I would never want to try to swap an engine into an obd2 car unless I was converting to OBD0 or OBD1. Many people working with OBD2 vehicles swap to either OBD1 or 0. But not always. The same goes for OBD0 vehicles. When people swap OBD1 and OBD2 controlled engines into their car, they generally don't transplant the OBD1 and 2 electronics with it. They usually keep they're OBD0 wiring. Sometimes people convert they're OBD0 cars to OBD1 but this is not as common as the previous example and requires a conversion harness or alot of knowledge and experience to do it urself.

One last thing that alot of people seem to forget or not think of. OBD (On Board Diagnostics) is not engine specific. It is based on the computer you are using. For example, you can use an OBD0 computer to run an OBD2 engine.

I hope i've helped a little.

[slyw/fbpsi]

Originally Posted by bambam89lx

OBD1 has it's advantages also
1. As crxlvr said, obd1 and obd2 are better when it comes to figuring out what's up with ur car and making ur CEL (Check Engine Light) go away. But, you must own the scanner tool to do this.

It is based on the computer you are using. For example, you can use an OBD0 computer to run an OBD2 engine.

I have always been able to check my cel codes and make them go away, with my 00si, 91 dx and the same 91 dx converted to odb1. And I didn't need a scanner to do it. for the 00 si and the 91 dx converted to odb1, all I did was hook a wire or safety pin into the diagnostic plug by the ecu and count the blinks on my cel, after you've fixed the problem, pull out the ecm and hazard fuse to erase the code. for my 91 dx, all you have to do is pull back the carpet and count the blinks and once again pull the corresponding fuses to clear the code. Yes, an odb0 computer can run an 0db2 engine, but you have to have parameters set in motion for it to do it, like rechipping the ecu, to activate vtec, or run a rpm switch or vafc to activate vtec.

[91civicDXdude]

"OBD* is a national standard. this is why all 96+ cars can be read with an OBDII scan tool. OBD1 isnt as standardized and many manufacturers have different plugs for their model specific readers and such. "OBD0" which is actually non-OBD, is the least advanced and non standardized.

the honda OBD0 system, although easily tunable, isnt the best way to go. OBD1 offers more tunability and more options, this being limited by the hardware in the OBD0 ECU itself which by design, has an 8 bit processor which can only do so much.

non-OBD or OBD0 is the easiest, least advanced, and cheapest

OBD1 is the standard in performance

OBDII sucks balls.

[lilol89crx]

OBD1 isnt as standardized and many manufacturers have different plugs for their model specific readers and such

very true i have 11 different plugs to my snap on scanner for obd-1 and only 3 types for obd-2.

[Cjz89civic]

Just to let you all know OBD1 and OBD2 all units can be jumpered(pins depend on what car and ecu) to read the codes in the ECU with the blinking engine light. Im told OBD1 is easier to program and change things internally it is also easier to disable the knock sensor with OBD1.

[crxlvr]

most obdII dont require a scanner either, the scanner is used to tell you in english what is wrong with your car, but most cars have a series of actions you must do and the CEL will flash a certain number of times, if you got a helms, you just look up the flashes and it tells you whats wrong.

in my class on a car, the sequence to get the code was as follows.
1. turn the car to start but dont crank
2. put the shifter in each gear starting from P>R>N>D>2>1 and then back up to the top.
3. turn the a/c on to full blast and then turn it off.
4. turn ignition back off, then back to start without cranking, and the code will flash.

everycar has a different sequence but they all should have one. a pretty time consuming series of events, thats why scanners were invented to just read what the hell is wrong.

[bambam89lx]

Yes, an odb0 computer can run an 0db2 engine, but you have to have parameters set in motion for it to do it, like rechipping the ecu, to activate vtec, or run a rpm switch or vafc to activate vtec.

that's not true. You don't have to do anything whether it's a non-vtec engine or not. U can run an LS engine from any year with OBD0 electronics without any problem. besides, there are OBD0 vtec ecus available such as the PR3 and the PW0 that ran the 4th gen B16's. They can power any b-series vtec without problem and without "rechipping".

[slyw/fbpsi]

Originally Posted by bambam89lx

that's not true. You don't have to do anything whether it's a non-vtec engine or not. U can run an LS engine from any year with OBD0 electronics without any problem. besides, there are OBD0 vtec ecus available such as the PR3 and the PW0 that ran the 4th gen B16's. They can power any b-series vtec without problem and without "rechipping".

your're right about that, I forgot, I could of saved money and just used a pr3 or pw0 to run my d15b vtec, instead of switching to odb1.

[bambam89lx]

actually, that engine came in both obd0 and obd1 as it was placed in 90-99 civic vti. besides....if you want to get VERY technical, you can EASILY run a B series motor on a D series ecu and vice versa. I'm going to be running my B18 with a PM6. so, I hope u werent being sarcastic about running ur D15B vtec with a PR3 cuz it can easily be done.

[lilol89crx]

most obdII dont require a scanner either, the scanner is used to tell you in english what is wrong with your car, but most cars have a series of actions you must do and the CEL will flash a certain number of times, if you got a helms, you just look up the flashes and it tells you whats wrong.

on some obd2 cars the scanner not only tells you what is wrong but also allows you to reprogram it to a point. dodge for instanace allows you to re-program the speed sensors(at the ecu) to change for different tire sizes. also the scanner allows you to do individual sensor checks, allows you to open/close,stop/start different relays etc to check for proper operation. this is the only reason i enjoy working on obd1-2 vehicles, scanners make it so much easier to pinpoint the problem on these newer vehicles

[slyw/fbpsi]

Originally Posted by slyw/fbpsi

your're right about that, I forgot, I could of saved money and just used a pr3 or pw0 to run my d15b vtec, instead of switching to odb1.

At this site http://asia.vtec.net/article/d15b/ it says it came out in the 91 EG family, which means it started out as an odb1 car. NO, I wasn't being sarcastic, If I had of thought of that, I could of saved myself $110, by just getting a pr3.

[91civicDXdude]

Originally Posted by slyw/fbpsi

At this site http://asia.vtec.net/article/d15b/ it says it came out in the 91 EG family, which means it started out as an odb1 car. NO, I wasn't being sarcastic, If I had of thought of that, I could of saved myself $110, by just getting a pr3.

every pm3 i've ever seen goes for *atleast* $100

[bambam89lx]

Originally Posted by 91civicDXdude

every pm3 i've ever seen goes for *atleast* $100

Right, I think he was talking about saving money by using a PR3 or PW0 instead of using a V-AFC which can cost over 300 dollars.

[slyw/fbpsi]

Originally Posted by 91civicDXdude

every pm3 i've ever seen goes for *atleast* $100

yeah, i spent $50 on the p08 and $160 on the conversion harness, so minus $100 for the cost of a pr3 or pw0 and I would of saved $110, like I said.