i have a CEL on, i went to an auto shop to get the codes but they told me it dint give any codes. there was no codes. CEL turns on when the engine is on, but when its off no CEL. also, my speedometer is stuck on 20mph as soon as you start the engine, earlier i was driving around was trying to hit the floor when suddenly my speedo worked, then i turned off my engine then its back to not reading my speed. -_- anybody who can help me with this? thanks

EDIT:
sorry about that, its a 99 honda civic EX d15b engine, i just bought it 2 weeks ago, and im not sure if the previous owner also changed the ECU but i opened the kick panel and i see some code that has a "P2P" in the middle which i assume an OBD2 ECU.

 

year, make model of car? What engine? auto or Manual?

We have no idea what car/engine you have to be able to tell you whats wrong.

 

This^

Please read the forum Rules sticky.

 

sorry about that, its a 99 honda civic EX d15b engine, i just bought it 2 weeks ago, and im not sure if the previous owner also changed the ECU but i opened the kick panel and i see some code that has a "P2P" in the middle which i assume an OBD2 ECU.

 

Click on the Codes sticky at the top. This will show you how to pull the codes yourself without a special tool. Do this to see whether you are able to pull any codes.

 

ok ill do it right now.

EDIT: will it work even if i dont get a CEL when the ignition is on II? cause i only get CEL when my engine is running/on or in IDLE.

 

sorry for double posting, but this is what i got, after the paper clip attached, i turned on the iginition to II and the CEL stays on.

 

Yes, try to pull the code anyway.

If no code is retrieved, then check whether the 7.5A hood Back Up fuse is blown.

 

ok so the fuse was blown and it was the wrong fuse. -_- it says 10.

 

Put in a fresh 7.5A fuse and then monitor whether it blows again.

 

ok thanks. i really appreciate the help!

so uhm...do you have any idea about the speedometer thingy?

 

If the Back Up fuse does not blow again, pull the codes the next time the CEL stays on while driving.

 

ok so after buying a new 7.5a fuse for the hood Back Up fuse, and jumping the service connector wire. it still doesnt give me any code, it just light up the CEL on.

 

• Make sure the fuse did not blow again

• Drive the car until the CEL turns on and then and only then jump the service connector.

 

the fuse dint blow. tested it with multimeter with 12.5v. drove it for 10 min, still has the light steady when jumping the service connecter.

 

Does the fuse have voltage on BOTH top tabs?

Did the CEL turn on during the 10 min drive?

 

yes both have voltages.

CEL turned on right after i started the engine. drove it for 10 mins, no blown fuse, turned the engine off, jump the connector, turned ignition to II CEL light steady.

 

Next time when CEL turns on, leave the engine running while you jump the service connector. Are you sure you have an OBD2 ECU? Post pictures.

 

yes i have an OBD2 ECU

What is this? i dont exactly sure what this is or if this is important but i know that something is not right in here. the black relay on the right image is suppose to be in that "L" shape thing in the middle image right? its broken.

Under Hood Fuse Box

 

Can you take a picture of the label attached to the side of the ECU?

 

its this code
37820-P2P-A12
6D 1213-238144
and im using a d15b non-vtec engine

 

The P2P ECU looks for the VTEC solenoid and pressure switch, as well as a knock sensor.

 

It's just messy wiring and placement from what I see.

 

Also do this:

 

so is there a way to make the ecu not look for the vtec, pressure switch and the knock sensor? or should i just swap my ecu to a non-vtec ecu?
ill do that jumping while engine runs tom. thanks for the help.