GsrRussell

My car popped a check engine light yesterday. The wierd thing is that when I go to jump the jumper and check the code, the check engine light completely goes away. I have a 96 Civic hatchback converted to OBD1 with a Ryewire harness, and Hondata S100 in a P72. I have been running the car for about 6 months and have had no problems.

I also notice that I have no vtec anymore.

Any suggestions would be greatly appreciated.

GsrRussell

BUMP, Any suggestions??

DaveF

are you leaving the key on when you go to check ?

GsrRussell

Yes

DaveF

what kinda driving conditions are popping the light on ? (engine load/rpm/mph) ?

GsrRussell

The light stays on constantly. As soon as I crank the car up it goes out like normal, then comes on and stays on. And when I try to jump the jumper to check the code, the light goes out completely.

DaveF

is there broken wire someplace ? from the ecu to the cel ?


is there any hesitation or any noticeable problem with the car ?

GsrRussell

No, noticeable hesitation or problem, besides the vtec not working. I don't know of any broken wire, like I stated, it ran perfect for about 6 months.

GsrRussell

Any other suggestions or ideas? Anybody?

D_koschak

have the tune checked mine is doing the same thing but i was able to pull a vtec code and i check changed rewired vtec and still nothing so my next step is new harness and if not that than it would be mechanical

DaveF

vtec needs -- ECT, speedo, vtec oil pressure, and i believe tps.

wright54

This might be a long shot but it is worth checking. I am not sure but I think that if the 7.5 fuse under the hood for the back up is blown you may not get a code after the car is turned off and turned back to the on position.

Good luck

totsie7944

I'm sure you've thought about it...but you know vtec won't work if your oil is too low right?

HiProfile

I'd inspect/test the S100. Usually this is one issue you get when the ecu has a bad chip in it, or in general is crapping out. I don't think S100 runs the checksum, but a bad checksum would do that.