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

[slEEpy_aL]

my cel turns on when I drive about 10 minutes or more but when I turn the car off then on it goes away. My dash lights are messed up sometimes too and the speedo stays at zero for a minute or two then it starts working again. If blinkers dont go on then a little tap on the dash would get them back up. Anyone know whats wrong?

[ExplodingCake]

my cel turns on when I drive about 10 minutes or more but when I turn the car off then on it goes away. My dash lights are messed up sometimes too and the speedo stays at zero for a minute or two then it starts working again. If blinkers dont go on then a little tap on the dash would get them back up. Anyone know whats wrong?

Your code is stored in the ECU , it won't go away until you fully reset the ECU.

[Cb7xChun]

Anybody know how to fix the intake air temperature sensor. I did the cel diagnose and got 1 long blink then nothing for 2 secs and it repeats

[ONEKLEAN91]

i just tryed this out its crazy that it really works!! my check engine light blinked 5 times and on the list it says that its the manifold absolute pressure sensor where do i get that from?

[pwrusr]

i just tryed this out its crazy that it really works!! my check engine light blinked 5 times and on the list it says that its the manifold absolute pressure sensor where do i get that from?

...aka the "map" sensor. it's located on your firewall in the engine bay.
Do you currently have a check engine light on while driving?

[ONEKLEAN91]

yeah man its staying on while im driving

[Aries1911]

Can't find plug/blue connector?

I've been tryin to find this thing for weeks, and still can't find it. Took out my kick panel, i can see the ecu when i pull back the carpet.. but i cant find the blue thing!! anybody have pictures of exactly what im lookin for and where it should be? i know the blue thing.. but is it plugged into a larger brown one? idk... plz help...

[90exkId]

ok so i have a 91 auto accord, my s light stayed on at all times an only drove in 3 gear. so i went to the junkyard an grabbed another trans put it in an still have the same problem. So I tried to pull the codes for the TCU not the ECU, an the S light does notheing, but my CEL light comes on an stays on while the paper clip is in the plug. So wat do i do now?

Does any one know if when you turn the key 2 clicks an the ECU flashes once, is the TCO sopposed to flash too? cuz theres a clear hole to see the red light for each, ECU an TCU.....

[Tippey764]

It took me 5 seconds to find the plug ( i didnt even have to remove anything ), plugged in the paper clip and pulled " 12 EGR - exhaust gas recirculation lift valve ". Thanks for the guide.

[IridiumCore]

A good idea I got from my buddy was to jump the OBD connector with a switch. I've got a radioshack switch on my dash to check CELs while I'm driving. I get a CEL, flip the switch, and know right away what it is.

If you don't mind my 2 cents that sounds like a good idea, I think you should put togehter a DIY for that.

[93Frost_cb7]

i dont have a paper clip or wire or connector atm. what else could i use?

[Vtec1nspir3dCB7]

I've been tryin to find this thing for weeks, and still can't find it. Took out my kick panel, i can see the ecu when i pull back the carpet.. but i cant find the blue thing!! anybody have pictures of exactly what im lookin for and where it should be? i know the blue thing.. but is it plugged into a larger brown one? idk... plz help...

Its a TINY blue plug up under the passenger kickpanel. Some people have found that that little plug was SHOVED up in the heating components. You'll just have to fish it out.

[Vtec1nspir3dCB7]

I just checked my light , it keeps doing long blinks and it doesnt stop, I counted up to 100...

Are there any spaces? There has to be pauses. Check again.

A good idea I got from my buddy was to jump the OBD connector with a switch. I've got a radioshack switch on my dash to check CELs while I'm driving. I get a CEL, flip the switch, and know right away what it is.

Please?!

[Vtec1nspir3dCB7]

Anybody know how to fix the intake air temperature sensor. I did the cel diagnose and got 1 long blink then nothing for 2 secs and it repeats

Only fix is to take it off and replace. Drivers side of engine on bottom corner of IM. Should be yellowish

[IridiumCore]

i dont have a paper clip or wire or connector atm. what else could i use?

I removed the plastic ends and black paint on a bobbie pin