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Old 12-11-2018, 02:46 PM   #1 (permalink)
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Need help 95 YJ

Looking for some direction. I have a 1995 YJ with the 2.5 and ax5 transmission.
This crusty Jeep is used entirely for plowing my driveway. Last weekend I did some maintenance including replacing the clutch and fixing the gas tank skid plate. After completing the work I went to pull out of the garage it the check engine light came on and it started running horrible.

The codes it shows are 12. 33, 24, and 55.

Code 24 is TPS out of range.

So far I have checked the connections on the sensors I unplugged to do the transmission. I found a chunk of rust in the crank position sensor so I just replaced it. That wasn’t it. When I start it it isles fine with no cel but when I try to move is turns on and proceeds to bearly run.
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Old 12-11-2018, 03:18 PM   #2 (permalink)
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Did you miss hooking a ground back up ? Speed sensor ?
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Old 12-11-2018, 03:26 PM   #3 (permalink)
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Did you miss hooking a ground back up ? Speed sensor ?
It’s possible. I double checked the speed sensor plug today. I don’t remember a separate ground.
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Old 12-15-2018, 07:27 AM   #4 (permalink)
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Code 12 is the battery has been disconnected within 255 starts, disregard that one.

Code 24 is either the TPS volts are low or high.

Code 33 is the AC clutch relay, often shows up if you don't have A/C so disregard it.

Code 55 is end of codes.

The TPS is a pretty important input to the computer. It is easily checked with a multimeter. One wire to it should have 5 volts with the key on. (Violet with a white tracer) One wire should have a good ground, (Black with a light blue tracer)the other wire is the sensor signal to the PCM (orange with a dark blue tracer).

You can back probe the connector with a paper clip or a needle through the seal on the back of the TPS connector to read the voltages with the multimeter.

Key on, Engine off, at closed throttle the reading should be over 0.2 volts. (Usually it's around .6V) Wide open throttle should be below 4.8 volts. As you sweep the throttle slowly, the voltage should gradually go up and down between these points without dropping out. Also, when you return to the closed throttle position, the reading should return to the same voltage as before.

I used to change a lot of TPS's on these. They are especially vulnerable to water and would often fail after the engine was washed.

Hope this helps!
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Old 12-19-2018, 09:14 AM   #5 (permalink)
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Make sure you buy an OEM TPS if that does happen to be your issue. I go through creeks/mud holes on the regular and PRESSURE WASH my engine after every outing and have yet to have any of my OEM sensors fail! If you buy aftermarket you WILL be replacing it sooner rather than later, light breeze causes that junk to fail
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