ENG: Diagnose a Check Engine Light and S/D4 errors.

[Clueless]

I used a wire to jump it, but it doesn't throw a code....but still gives a CEL.

[Accordlx]

Very NIce trick. Ima Try this on my camry.

Btw , HOw do i use da Quick Reply box

[pwrusr]

Very NIce trick. Ima Try this on my camry.

Btw , HOw do i use da Quick Reply box

I don't know if this will work on a camry. Check out www.toyotanation.com for that kind of infomation.

As for the quick reply, there's a button you can press right next to the "quote" button in the posts.

[HenRoc]

Would help.. but I cant say that I throw CEL's enough to justify a switch.. but if it works for someone, kew. Now on my moms 97 civic... I think i might do that. Stupid thing runs fine, but throws codes ALL the time. They are usually "misfire cyl. 1-4"

Would a 1997 Civic be an OBD II ?

[pwrusr]

Would a 1997 Civic be an OBD II ?

yes

[2lo4sno]

whats a cel light ? my cars canadien

[ukaccord92]

ive done just that b4 but what about when you get check light while drivin and you check for codes and the light stays solid and doesnt flash ? huh .....

[pangga]

Does anyone know how to check if the ECU is faulty? I use to get CEL codes and did a little tweak (replaced my dizzy) and the blinking is gone. Now the check engine light turns on for a few seconds and then turns off. I tried to check if my ECU is still good by disonnecting some of the sensors like the temp/coolant sensor, but I dont get any CEL code. Is that a bad sign?

[floored]

4. Compare to this list to see what the problem is:

1 O2A - Oxygen sensor #1
2 O2B - Oxygen sensor #2
61 Primary oxygen sensor
63 Secondary oxygen sensor
65 Secondary oxygen sensor heater
.

i know this is old but i though obd1 only had 1 o2 sensor?

[aero]

i know this is old but i though obd1 only had 1 o2 sensor?

Yeah, but the list is just a general list that they have kept... not all apply to our cars.

[Shehzada]

Eventhough my car has never given me a CEL , today I decided to pull codes (stored codes) for the heck of it. I jumped the wires on the blue connector and turned the switch to 2. The CEL came on but never went out even after I waited a minute or two. I then started the car (jumper still on) and the same thing happenend.

What does that mean?

[Clueless]

Eventhough my car has never given me a CEL , today I decided to pull codes (stored codes) for the heck of it. I jumped the wires on the blue connector and turned the switch to 2. The CEL came on but never went out even after I waited a minute or two. I then started the car (jumper still on) and the same thing happenend.

What does that mean?

Solid CEL? It means bad ecu....

[cp[mike]]

when jumped, if theres no codes stored, the CEL will stay on solid. disconnecting the jumper will return the CEL to an off state. this doesnt mean you have a faulty ECU, unless:

when the CEL is on and you jump the connector to pull the code and the light doesnt flash at all, thats a sign of a faulty ECU.

[Shehzada]

when jumped, if theres no codes stored, the CEL will stay on solid. disconnecting the jumper will return the CEL to an off state. this doesnt mean you have a faulty ECU, unless:

when the CEL is on and you jump the connector to pull the code and the light doesnt flash at all, thats a sign of a faulty ECU.

Mike, thank you so much for providing that answer. I was already on eBay checking out replacement ECU's. Thank god my ECU is not faulty and my car is not throwing a code.. Thanks again bro!

[SuddenCb7]

Would a 1997 Civic be an OBD II ?

I beleive any vehicle 97 and after is obd2. Nice write up.