Replaced head gasket after throwing multiple codes and stalling. Now the diagnostic is saying "vehicle not responding". Used scanner before no problem. Wondering if maybe I missed a connection under the hood or fried the ecu with all the codes??? CEL came on(seems like IACV) so I think the ECU is fine. Any help diagnosing OBD port would be great. I've searched but can't find pinout for P2P 92A ECU. Everything has only 3 connections not all four like my ECU.
JUST LEARNING AND DOVE IN FAST IT SEEMS

 

Is hood fuse 43 blown?

 

Checking right now. Didn't know about that fuse, knew about backup/radio one. Thanks, I'm going out to check now.

 

Checked it, it's not blown. On my fuse box that's for interior lights. My ECU looks like it's on#47 of that diagram.
I started to check pinouts but hit a dead end when I couldn't find the K-Line on my ECU.All the diagrams of ECU's I find have only 3 connections, where I have 4. I'm over my head but trying to learn to tread water.

 

Fuse 43 also protects the data link connector (DLC) circuit. Does the dome light work?

Fuse 47 protects the ECU Back Up (memory) circuit.

Does the engine start and run?

 

Yeah, dome light works. Car runs fine most of the time. occasional rough idle.

 

Yeah, fuse 43 is good.

Does the clock remember time or does it reset after turning the key off?

 

Clock remembers time.

 

Is your scan tool possibly the problem?

If not, check whether terminal 8 of the DLC connector gets battery voltage and that the two black ground wires at terminals 12 and 13 have continuity to body ground.

Test the Blu/Yel wire for continuity between the DLC connector (terminal 15) and ECU A21.

 

Yeah, continuity is there on all. wondering... OBD2 connectors universal for scanners? This one works on my wife's Ford. When I look at pins on scanner's connections the only ones that make connections are 2,4,5,6,7,10,14,15,16.No connection on 1,3,8,9,11,12,13

 

You cannot expect the scan tool to communicate with your Civic without connections with DLC terminals 8, 12, and 13.

 

I borrowed scanner. Each time I configure it for OBD2 Honda and no reading. For my wife's car I configure it for OBD2 Generic tried for mine but doesn't work.

 

Unplug the IAT to throw a code. Take your car to AutoZone to see whether their code reader can communicate with your ECU.

 

Will do. Thank you. Thank you. Thank you.

 

hey dsqaure let me know if it works im having the same problem on my civic the scanner gets power but just wont connect . i brought it for emissions and there computer wouldnt connect either i need to get it fixed too to get past emissions testing thank you

 

Borrow a scanner, try several different ones if you have to. It is a very common problem that one scanner will not work but another would.

 

Yea some cheaper scanners sometimes won't work between cars. For example. My act programmer for my BMW will only scan it and won't read codes off other vehicles even under universal Obd. My Honda scanner at work will only pull codes on h and a vehicles.

 

Took it to Autozone, pulled IACJ, they read the code no problem. Scanner I have doesn't work with my car. I think they have a separate cord for it but my brother doesn't have the one for Honda. Thanks to everyone and good luck Dlee. At least now I know a little more about OBD2 and ECU connections. Inspection here I come!

 

On your year any obd2 connector should work. Doyouhave any bent pins in the connector on your scanner by chance?

 

Not that I can see. I don't know if any of them are completely broken off though. But then why would it work on the Ford? I'm at a loss. I watched the guy from Autozone hook his scanner up and got the code.

 

When I worked at a infiniti dealership I can't remember a time the factory scanner did not work on a infiniti car. I only worked there a year though. When I worked at an independent shop and then opened my own shop it was very common for some cars to not work with some scanners.

 

has the ecu ever been swapped on the car?

 

got my emissions and passed it. the ecu was obd1 put a obd in it i feel stupid i didnt check that

 

lololololololoololololololooloololoolo

 

Its always the easiest stuff that gets ya!