Code 51!! Help!! - MR2 Owners Club Message Board
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post #1 of 21 (permalink) Old July 13th, 2007, 19:38 Thread Starter
 
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Code 51!! Help!!

1991 5sfe. this is what happens, i try starting the car and it likes to sputter and backfire alot. it will only stay running when if i keep my foot in the pedal. then after a little bit of that going on it will "catch" and rev up and run normally for a while. sometimes it will run great all day and even start up great! but then other times it will want to die when i am going down the road (drop about 1000 rpm and start backfiring again). problem doesnt happen all the time which makes it hard to figure out. with the code being a 51, what could it be?? its my only vehicle so any help would be great. thanks! Oh and i also put a timing light on it and when it messed up the light stopped blinking but the engine was still trying to run....
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post #2 of 21 (permalink) Old July 13th, 2007, 19:46
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.. thats a weird code.



im betting you have either an unplugged/very misadjusted TPS sensor, or a bad wiring harness.
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post #3 of 21 (permalink) Old July 13th, 2007, 21:10 Thread Starter
 
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thats what i am thinkin to because the neutral safety switch wouldnt cause that i dont think. whats the best way to readjust a tps sensor???

Last edited by mr2project_5sfe; July 13th, 2007 at 22:42.
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post #4 of 21 (permalink) Old July 14th, 2007, 11:07
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Quote:
Originally Posted by TomsMR2
.. thats a weird code.



im betting you have either an unplugged/very misadjusted TPS sensor, or a bad wiring harness.
That's exactly what I said! It's a very odd code.




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post #5 of 21 (permalink) Old July 14th, 2007, 11:15
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I got a TPS for about $50 from Toyota. Keep in mind that I get a discount through my company...I believe list is about $60-65.

89452-22010 - Manual Trans

89452-12040 - Auto Trans (hopefully this is not you....list is $95)

However:

1. Loosen the two set screws that secure the TPS to the throttle housing. (DO NOT REMOVE THE SCREWS)

2. Connect an Ohmmeter to terminals IDL and E2 of the TPS after removing the connector.

3. Insert a 0.028 in. (0.70 mm) feeler gauge between the throttle stop screw and stop lever.

4. Rotate the TPS counter-clockwise and slowly back clockwise until the Ohmmeter just looses continuity, (infinite ohms).

5. Secure the TPS with the two set screws.

6. Remove the feeler gauge and recheck TPS setting.

7. There should be continuity with a 0.020 in. (0.50 mm) feeler gauge inserted in the stop. There should be NO continuity with a 0.035 in. (0.90 mm) feeler gauge inserted in the stop.

8. Remove the Ohmmeter and reconnect the TPS connector.

w/ AUTOMATIC TRANSMISSION:

1. Loosen the two set screws that secure the TPS to the throttle housing. (DO NOT REMOVE THE SCREWS)

2. Connect an Ohmmeter to terminals IDL and E2 of the TPS after removing the connector.

3. Insert a 0.024 in. (0.60 mm) feeler gauge between the throttle stop screw and stop lever.

4. Rotate the TPS counter-clockwise and slowly back clockwise until the Ohmmeter just looses continuity, (infinite ohms).

5. Secure the TPS with the two set screws.

6. Remove the feeler gauge and recheck TPS setting.

7. There should be continuity with a 0.020 in. (0.50 mm) feeler gauge inserted in the stop. There should be NO continuity with a 0.028 in. (0.70 mm) feeler gauge inserted in the stop.

8. Remove the Ohmmeter and reconnect the TPS connector.

Last edited by DPancoast; July 14th, 2007 at 11:19.
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post #6 of 21 (permalink) Old July 14th, 2007, 12:11
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hey what code reader did you use i cant find any for my 92 N/A
they all tell me that they dont make code readers for 1992 .....only 1997+
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post #7 of 21 (permalink) Old July 14th, 2007, 12:33
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you use a paper clip.
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post #8 of 21 (permalink) Old July 14th, 2007, 15:01 Thread Starter
 
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i found a tp sensor for a little over $50 at a parts store. bad news is that i dont have a DVOM, it was stolen. And i've never messed with the tp sensor since i've had the car so i'm pretty sure its the sensor. do new tp sensors come pre-calibrated so all i would have to do is center it up and screw it on??
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post #9 of 21 (permalink) Old July 14th, 2007, 23:27
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I told you I have a multimeter that you could use! GEEZ!




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post #10 of 21 (permalink) Old July 18th, 2007, 21:37 Thread Starter
 
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well i finally figured it out. it was the ignition coil!! i am happy that i know now but am pissed because the computer sent me in the wrong direction. reason it did is because the middle pin on the tp sensor goes to the ecu as a signal wire....that same wire splices off unto other parts of the engine harness into other plugs, (like the ignition coil plug) which is why the computer told me it was a short in the tp circuit. well at least thats what i think is the reason why. i plan on picking up a new one tomorrow and getting it up and running again. thanks guys....Peace!!
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post #11 of 21 (permalink) Old July 18th, 2007, 21:43
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Quote:
Originally Posted by mr2project_5sfe
well i finally figured it out. it was the ignition coil!! i am happy that i know now but am pissed because the computer sent me in the wrong direction. reason it did is because the middle pin on the tp sensor goes to the ecu as a signal wire....that same wire splices off unto other parts of the engine harness into other plugs, (like the ignition coil plug) which is why the computer told me it was a short in the tp circuit. well at least thats what i think is the reason why. i plan on picking up a new one tomorrow and getting it up and running again. thanks guys....Peace!!
Ah, all the reason why OBDI was overhauled and made into OBDII. Well, hope everything works out so you can get to driving your 2 again.
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post #12 of 21 (permalink) Old July 18th, 2007, 21:54
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Great Nick! See should have just went with me and my gut initially when I said it was your coil! It had all the symptoms of the coil but the code 51 was just making us second guess! Sucks that you pulled the engine harness but it good though because it's how you finally figured out that it was the coil for sure! Told you it was something simple!




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post #13 of 21 (permalink) Old July 19th, 2007, 18:32 Thread Starter
 
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bad news!!! its not just the ignition coil, but also the ignition control module!! i am really depressed right now because i have absolutely NO money!!! this sucks! and there is a grey plug that is right next to the ignition coil....what is it for?? hope its nothing important because i lost it. i hate this whole situation.
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post #14 of 21 (permalink) Old July 19th, 2007, 18:40
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^It's not a big deal. Search on here for some one that has them used. Give PA autoracing a buzz and see if you can get some from him. Or I can.




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post #15 of 21 (permalink) Old July 21st, 2007, 10:10 Thread Starter
 
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now i am really starting to wonder if it was the distributor connector, cause when i would move the distributor to advance or retard the timeing it seems to want to run more often. would the engine run the same way without it disconnected??? but this doesnt explain why i have a code 51!!! this is really starting to make me upset.
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post #16 of 21 (permalink) Old July 21st, 2007, 10:28
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Ignore the code 51. Have you fixed that harness at the dizzy yet?




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post #17 of 21 (permalink) Old July 21st, 2007, 21:04 Thread Starter
 
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no i am going to order the pigtail from toyota monday. anything else it could be and that i should check out?
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post #18 of 21 (permalink) Old July 21st, 2007, 21:07
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thats your code 51 then, the dist sends those signals.

always ignore cel codes if you know you have an existing problem.
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post #19 of 21 (permalink) Old July 22nd, 2007, 00:28
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Quote:
Originally Posted by mr2project_5sfe
and there is a grey plug that is right next to the ignition coil....what is it for??
It's just a noise filter. I have the same thing on my 1MZ igniter.
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post #20 of 21 (permalink) Old July 22nd, 2007, 13:54 Thread Starter
 
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well i checked the tp sensor and i have five volts going to it so thats good. but when i would open the throttle, it would stay at five volts then cut instantly to 0 volts. isnt it supposed to slowly go down to 0 volts. like an analog signal? well, I'll get the new connector first and let you guys know if that fixes the problem.
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