How do I fix a 121 and 335 OBD1 code? - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 06-28-2012
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How do I fix a 121 and 335 OBD1 code?

Its on a 94 Ranger 2.3L dual plug head. I know the 121 code is the tps voltage stuff, and the 335 deal with the egr. Problem is, how to fix it? Any ideas?? Or do i just need to buy a new tps and egr sensor??
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Old 06-30-2012
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Put the new egr sensor on it. And its still doing it. Guess its the tps??
Also my dad messed with the idle screw, So i really dont know where its suppose to be since theres no tach.

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Old 07-01-2012
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Really? No Help?
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Old 07-01-2012
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Quote:
Originally Posted by Ranger2.394 View Post
Really? No Help?
Can you tell where the knocking noise is coming from??? Have you tried disconnecting the negative battery cable to reset the computor???

Did it die before you cleaned the MAF???

Last edited by tempfixit; 07-02-2012 at 05:29 AM.
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Old 07-02-2012
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That knocking sound is that coil bracket. We had to modify it to get it bolted on. Yeah, The battery has been in and out of the truck numerous times. And yes it did die before i tried cleaning the maf. Im thinking its just the tps now since its the only code its throwing. It threw a egr code put the sensor on it and that went away but no change to the way it idles.
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Old 07-03-2012
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Quote:
Originally Posted by Ranger2.394 View Post
That knocking sound is that coil bracket. We had to modify it to get it bolted on. Yeah, The battery has been in and out of the truck numerous times. And yes it did die before i tried cleaning the maf. Im thinking its just the tps now since its the only code its throwing. It threw a egr code put the sensor on it and that went away but no change to the way it idles.
Have you checked to see if there is any voltage to the MAF sensor,
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Old 07-04-2012
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How do I check that?
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Old 07-04-2012
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Originally Posted by Ranger2.394 View Post
How do I check that?
This link should help you:

Part 1 -Ford MAF Sensor Test (P0102, P0103, P1100, P1101)

Have you checked for any vacuum leaks?

Here iisanother link for testing TPS:

http://oldfuelinjection.com/?p=30

Last edited by tempfixit; 07-04-2012 at 01:29 PM.
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Old 07-05-2012
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Well on the vacuum leaks, I grabbed one of my buddies smoke machine that you hook up to test for vacuum leaks. Ran it, and never saw any signs of smoke come out. If the maf was messed up wouldn't it throw a code?? Like i said, its still throwing a tps code. and it runs better with the mass air unplugged. Would the tps be the culprit??
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Old 07-05-2012
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Originally Posted by Ranger2.394 View Post
Well on the vacuum leaks, I grabbed one of my buddies smoke machine that you hook up to test for vacuum leaks. Ran it, and never saw any signs of smoke come out. If the maf was messed up wouldn't it throw a code?? Like i said, its still throwing a tps code. and it runs better with the mass air unplugged. Would the tps be the culprit??
Yes the tps could be bad, test the tps, the link i attached should help test it.
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Old 07-05-2012
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Man I can not find a wire piercing probe anywhere but amazon. I was hoping I wouldn't have to order and I can just got get one. But no one carries em?
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Old 07-05-2012
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Originally Posted by Ranger2.394 View Post
Man I can not find a wire piercing probe anywhere but amazon. I was hoping I wouldn't have to order and I can just got get one. But no one carries em?
Here is a video on testing a tps on a 5.0 ford engine that should help you test thhetps also.


Do you have a multimeter?? Do you have a test light that you could use the tip of to pierce the wire and hook the multimeter to???
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Old 07-10-2012
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Have you gotten this thing running right yet?
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Old 07-10-2012
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Well I finally got my power probe and it turns out the tps is putting out like 5 volts.
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