Ok I fixed the last CEL 71 that popped up
NOW 31 AND 41 ARE BACK!
Ok so if 31 is vacuum sensor could it be the Thermo Vacuum Valve for the EGR? no parts places have a listing for a vacuum senor for a 1989 corolla with a 4AF motoer but the Thermo Vacuum Valve comes up.
And as far as the 41 CEL
Can some one guide me to this switch? there was a old post but the pics have been taken down. 41 is supposed to be the TPS but mine has a carb so I think its a "throttle switch" and I dont know where its at
I found this link to a old post that pretty much deals with the whole problem I am having. Take a look there is a lot of good info here 89 Corolla Hesitation
I changed the title of this post just in case anyone needs to search it
Ok changed the throttle switch so far so good going to get smog today.
Wow when I first looked I was amazed at how many vac lines there are but once I started labeling them it came out to 8 vac lines but it looks like alot more! It is really tight trying to get the 2 front nuts on the carb back on that took the most time, but the whole thing took about an hour. I tested the old switch and it worked about 80% of the time but it was old and did not work a smooth as the new one. There is no way to get it off without taking the carb off.
I know this thread is a couple months old, but I'm hoping I can get some help. My 89 Corolla sedan 4AF engine had the CEL code 41 pop up. This occured after I took the car into a shop to get the carb overhauled. When I went to inspect the throttle switch, I noticed the throttle plate that sticks out in front of the switch never came into contact with the tip of the plunger, so basically the switch always had continuity. I adjusted the throttle plate so that it made contact when the throttle was closed. Using an ohmmeter I verified that at no throttle there was no continuity, and when the throttle opened up there was continuity. After putting everything together, the CEL code 41 still shows up (after resetting the "ecu").
So I went ahead and bought a new switch, and replaced it. BTW it IS possible to replace the throttle position switch without removing the carbureator -- just remove the air cleaner assembly, and carefully remove the two screws and work it out. I adjusted it throttle screw so that the switch made continuity when the RPMs were at 1800 rpms. After all that, the CEL code 41 STILL shows up. I had a shop look at it, and they couldn't figure it out either, and according to their All Data work procedure flowchart it leads to say "try new ECU."
How important is it to accurately set the throttle plate so the throttle switch closes (makes continuity) at the right spot? Would an incorrectly set throttle adjustment screw cause the CEL code 41 to show up?
Oh man this brings back memories! ok the way I set the switch to release right at 1800 as well but I also replaced a few other things as well, the vacuum modulator (the round one near the firewall). and I cleared the code by unhooking the battery. Did you clear the code? also check the vacuum lines that are around the carb from what I understand the TPS controls some of the vacuum to the modulators, mine were fine but it was a PITA to get to all of them. I took the carb off gave me more room to see everything a little better.
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