6G Celicas Forums

My engine light has been on for two yrs now I believe it was the egr code. And I'm probley not gonna bother fixing it. I was just wondering if there anything I can do to disable the check engine light like pull a fuse or bulb I need my inspection sticket done soon.

You are going to want to get that checked because the EGR has a big part in emisions. Also it is a check to see if the CEL even lights and can fail a car if it doesn't. What year is your celica and we can help you get the codes and give some advice on how to get it fixed.

if you have a 96+ with OBDII they're just going to plug the scanner into the car and the codes will come up anyway. and if you have a 94-95 with OBDI they probably just use the sniffer (I guess) and if its your EGR valve then you'll most likely fail emissions anyway, it won't matter if the bulb works or not

and I believe the fuse for that controls all the gauge lights

its a 94gt lights been on for 2 or 3 yrs years now. ive been bribing the guy at this shop I go to but my brother went a couple of weeks ago and said they dont do it no more. well I brought it to the shop like 2 yrs ago changed the egr with three different one light still on then they cleaned throttle I believe and still on. Last time I ran emissions I was still below the allowed amount I just can't pass because the stupid light is on.

ever reset the ECU after changing the EGR? pull the EFI fuse and see if it goes off. if not I guess pull the bulb

i didnt do it the people at the shop did it. not sure if I ever saw them pull a fuse im gonna assume no. where is the efi fuse?

in your fuse box under your hood.

my car has the CEL too. I've pulled the EGR off twice and cleaned everything out both times, pulled the fuses, and it makes the light go off for a little while then it comes back on. I need my car smogged before next month, so I just ordered a new EGR and vaccuum module and I'm hoping it'll be fixed after that. if not, my guess is the sensor is faulty or something...

i guess im in the same boat as you I just gave up after going to the shop like 20 times for the same damn thing. the shop told me to go to the dealer. The longest I got the light off was about 3-4 hrs. Throw some ideals at me guys I have 3 weeks lefted.

the thing is, if they tried three different EGRs on there but didn't reset the computer (by pulling the EFI fuse) it could cause the CEL to stay on even if the problem was fixed. what needs to be done is after the new EGR goes on, reset the computer, there should be no CEL when you start the car, and if it doesn't come on again after the computer has relearned everything (I think it's supposed to be like 50 miles of driving.) then your problem is fixed.

I'll let you know how it works out for me with the new EGR and vacuum module.

Clear computer, then drive car to emissions station, do not shut it off. CEL illuminates after second drive cycle. If you get it tested during first drive cycle your good to go.

thats what i did the light came back one right after i was done.

did it pass? how high was your NOx?

Btw, I recieved my new EGR today, I should be putting it on tomorrow so I'll let you know if it fixes my problem.

This post has been edited by 6strngs: Mar 9, 2007 - 12:22 AM

ok, so today I put on a new EGR valve, vacuum module, and a new sensor (the one that plugs into the EGR valve). I pulled out the ECU and EFI fuses for aprox. 30 seconds, then put them back in. I've started the car 3-4 times, but haven't driven it very far yet. so far no check engine light though, so if it really does come on during the second drive cycle then the problem is fixed. I'm 99% sure the problem is fixed, but I'll let you know if it does happen to come on after a little more driving.

thanks keep me updated. I did safety only this yr so no emissions test this yr.

bad news. CEL came back on again! I'm stumped. I have no idea what it could be.

most of the time its your o2 sensor

how would the o2 sensor throw a code for the EGR?

Did you check to see if your EGR Vacuum Switching Valve is working properly?- it's attached by a vacuum line to the EGR valve and is a soleniod for controlling the opening and closing of the EGR valve.

< from alldatapro.com tech manual>
Unbolt it and use a volt meter to check that there IS continuity between the terminals. Resistance should be 37-44 ohms at 68deg F. If there is NO continuity replace VSV. Check for continuity between each wiring terminal and the valve body, replace VSV if continuity IS found. Inspect VSV operation blow air thru the hose that was removed from the EGR valve, air should blow from the filter. Apply battery voltage 12Volts across valve terminals then blow thru hose air should not blow from the filter. If not as specified replace VSV.

See if that helps you troubleshoot the problem. Let us know.

Check these areas too;

Code 71 EGR system malfunction only. Deteching condition; Gas temp is 158deg or below for 50 seconds under the following conditions.
Coolant temp 140deg or more
EGR operation possible, ie auto trans in 3rd or manual in 5th @55-60 mph flat road.

Check for items below per alldatapro.

1. A short or open in the EGR gas temperature sensor circuit-
2. Short in EGR vacuum switching valve circuit
3. Clogged gas passage
4. ENgine Control Module problem

I replaced the vacuum switching valve at the same time as the EGR.

for a little while the light would come on for a while, then go away, now it just stays on constantly. I might try to inspect for more possibile things gone wrong tomorrow or this weekend. I need it smogged before next month!