95 jeep will not go into OD - Page 3 - JeepForum.com
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post #31 of 40 Old 07-05-2011, 11:22 AM
Foundrydude
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There is only one speed sensor down there. It comes off the transfer case on a 4wd, it comes off the transmission tailshaft housing if 2wd.

Clear and rerun the codes, see if 55 comes back. That indicates the computer is not reading speed signal. Meaning either you didn't engage the gear properly when the adapter was disturbed, you have another bad sensor, or there's a bad wire.

Did you actually see the speedometer gear when changing the sensor? if so I'm betting it's an engagement problem. You have to kind of twist the unit to engage, then tighten.

On mine, once the sensor started working I gained overdrive, but the speedo head was messed up and only read speed when it felt like it. No code at that point but had to replace the speedo head to get it showing speed. Makes me wonder if the bad speed sensor plays havoc with a speedometer head.

good luck

Edit- I am a *******. 55 code is "end of codes", had them mixed up. Anytime you have a code you actually have two, with 55 sort of telling you the diagnostic worked & is over. The first code is what you're looking to repeat.

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post #32 of 40 Old 07-05-2011, 12:59 PM
JrMechanic
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No, there are two speed sensors. The output speed sensor for the transmission as well as the vehicle speed sensor. He apparently replaced the output speed sensor.

Want to swap an NP242 or NP231 into your ZJ? Here's how:
http://www.jeepforum.com/forum/f13/n...pdated-685644/
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post #33 of 40 Old 07-06-2011, 07:36 AM
Foundrydude
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The VSS on the transfer case controls the speedometer and sends speed signal to the computer which in turn allows overdrive. They are one and the same on this truck.

If there is another speed sensor down there, which I don't think there is, it's function is not related to the speedometer or the computer reading vehicle speed. Which is the root problem here. Good luck to the OP.
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post #34 of 40 Old 07-06-2011, 10:10 AM
JrMechanic
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Quote:
Originally Posted by Foundrydude View Post
The VSS on the transfer case controls the speedometer and sends speed signal to the computer which in turn allows overdrive. They are one and the same on this truck.

If there is another speed sensor down there, which I don't think there is, it's function is not related to the speedometer or the computer reading vehicle speed. Which is the root problem here. Good luck to the OP.

Well think again, because you're wrong. There are two speed sensors as I said before.

Want to swap an NP242 or NP231 into your ZJ? Here's how:
http://www.jeepforum.com/forum/f13/n...pdated-685644/
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post #35 of 40 Old 07-07-2011, 12:52 PM Thread Starter
jherz07
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thanks for all the help i'm still trying to fix it. keep it coming
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post #36 of 40 Old 07-07-2011, 03:43 PM
JrMechanic
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Which sensor did you replace?

Output speed sensor:



Vehicle speed sensor:




The VSS in the transfer case does indeed control the speedometer. There are different positions that the sensor can be installed, it needs to be clocked correctly. Try removing the sensor and rotating it 90 degrees, then reinstalling. Repeat until it works or you're out of positions.

Want to swap an NP242 or NP231 into your ZJ? Here's how:
http://www.jeepforum.com/forum/f13/n...pdated-685644/
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post #37 of 40 Old 07-07-2011, 09:32 PM Thread Starter
jherz07
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1995 jeep OD issues

I've replaced the input & output sensors, dropped the tranny pan & replaced the governor pressure solenoid & I order the governor pressure sensor. But after putting the solenoid in, the OD light still won't turn off or engage into OD. Any more ideas? I really appreciate all the help!
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post #38 of 40 Old 07-07-2011, 09:40 PM
JrMechanic
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Did you replace the OD solenoid or just the governor pressure sensor and solenoid? Is your speedometer working? OD won't work if the speedometer isn't.

Want to swap an NP242 or NP231 into your ZJ? Here's how:
http://www.jeepforum.com/forum/f13/n...pdated-685644/
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post #39 of 40 Old 07-07-2011, 09:56 PM Thread Starter
jherz07
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did not change od sen. changed governer pressure solenoid and ordered pressure sen and i changed od button on dash speedometer is working. still no od
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post #40 of 40 Old 07-07-2011, 10:07 PM
SouthSeaPirate
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My OD issue was fixed when I replaced my TPS. If you have a multimeter, give it a test. Couldnt hurt. GL
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