CEL appear and disappearing

Joefishizzle · 05-16-2012, 07:01 PM

Okay so very frustrated, the light came back on after numerous drives with no light after the new tps and connector installed. Again I checked codes and 21,41, & 51. How do I know which code is current and which are just stored?
I put the new Tps on and adjusted it, idk if I did that correctly however.

Im just confused and very regretful of buying this damn car. Plz help lol

cre · 05-17-2012, 06:23 AM

Code 51 won't cause the check engine light to appear under except while the ECU is in diagnostic mode. Improper TPS calibration will not cause a code 41 either.

Have you tested the wire harness? I would inspect and clean the ECU grounds and grounds from the battery. Test the alternator. Test the Vc pin at the ECU, the TPS, and the AFM connector; It should read 4.8v or so when the ignition is in the "on" position.

The ECU is still a possibility but unless you've got a known good one you can swap in to test with I wouldn't spend money on one without testing as much as possible first... Start with the cheap stuff or this car will sink you financially.

EDIT: Clear codes by removing the EFI fuse in the engine bay fuse box for 10 seconds or more.

Joefishizzle · 05-18-2012, 04:32 PM

thanks cre for the speedy response, well i didn't do anything after the code came on. just parked it and went into work since i didn't have time to mess with it. came back after i was off and drove it home.....no code. hmmm.....well anyways while i was at work i decided to splurge and buy a new AFM since currently i work at a parts distributor and scored a reman one for 100 bucks out the door!

way better than buying retail from vatozone, same part too!.

I went home with no codes on, installed the new AFM. started the car and wow what a difference. no more crazy surging idle. however the idle was up too 1500 and steady, so i re adjusted the tps and knock on wood the car has been running great the past day or so at about 700 to 800 steady idle. i will keep up on this and let you know if more codes continue under driving.

05-17-2012, 06:23 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Code 51 won't cause the check engine light to appear under except while the ECU is in diagnostic mode. Improper TPS calibration will not cause a code 41 either. Have you tested the wire harness? I would inspect and clean the ECU grounds and grounds from the battery. Test the alternator. Test the Vc pin at the ECU, the TPS, and the AFM connector; It should read 4.8v or so when the ignition is in the "on" position. The ECU is still a possibility but unless you've got a known good one you can swap in to test with I wouldn't spend money on one without testing as much as possible first... Start with the cheap stuff or this car will sink you financially. EDIT: Clear codes by removing the EFI fuse in the engine bay fuse box for 10 seconds or more. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar ---> Last edited by cre; 05-17-2012 at 06:25 AM.

05-16-2012, 07:01 PM	#1
Joefishizzle 3" Exhaust Join Date: Mar 2012 Location: California Posts: 105	Okay so very frustrated, the light came back on after numerous drives with no light after the new tps and connector installed. Again I checked codes and 21,41, & 51. How do I know which code is current and which are just stored? I put the new Tps on and adjusted it, idk if I did that correctly however. Im just confused and very regretful of buying this damn car. Plz help lol

05-18-2012, 04:32 PM	#3
Joefishizzle 3" Exhaust Join Date: Mar 2012 Location: California Posts: 105	thanks cre for the speedy response, well i didn't do anything after the code came on. just parked it and went into work since i didn't have time to mess with it. came back after i was off and drove it home.....no code. hmmm.....well anyways while i was at work i decided to splurge and buy a new AFM since currently i work at a parts distributor and scored a reman one for 100 bucks out the door! way better than buying retail from vatozone, same part too!. I went home with no codes on, installed the new AFM. started the car and wow what a difference. no more crazy surging idle. however the idle was up too 1500 and steady, so i re adjusted the tps and knock on wood the car has been running great the past day or so at about 700 to 800 steady idle. i will keep up on this and let you know if more codes continue under driving.