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what the he*# is this?

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Old 08-15-2014, 01:33 PM
98beater 98beater is offline
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Default what the he*# is this?

I got under my truck to pull the trans because of no overdrive, and I noticed this hanging there when I went to take off the front drive shaft. I can see the all stud it pushes onto, I just have no idea what it is or does. That picture is on the driver side of the trans, right by the shifter linkage.
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  #2  
Old 08-15-2014, 01:59 PM
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Looks a lot like the trans end of the TV cable.....
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Old 08-15-2014, 02:02 PM
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After playing with it for a minute I figured out that's what it is. Is there a chance that it not being hooked up could cause me not having overdrive?
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Old 08-15-2014, 02:07 PM
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hook it up and find out! wonder how long that's been unhooked
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Old 08-15-2014, 02:30 PM
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Suppose it depends on the the throttle valve thinks you are doing with the gas.... past a certain point, it will automatically kick down. Hook it up, go for a drive, see what happens.
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Old 08-15-2014, 02:38 PM
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Quote:
Originally Posted by 98beater View Post
After playing with it for a minute I figured out that's what it is.


That's how I solve problems
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Old 08-15-2014, 02:51 PM
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Went for a drive and it shifts awesome, but still no overdrive. Shifts awesome in the other three gears. Is it possible to just switch the overdrive from my new to me trans to the trans that's in my truck or do I have to pull the trans. I know the service manual said od is serviceable without pulling the trans.....
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Old 08-15-2014, 10:36 PM
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you will need the special tool to insert when you pull the OD unit to keep it all aligned I believe... well, iirc you need to tool if you do not play to overhaul the unit..
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Old 08-16-2014, 11:07 AM
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Think I would start trying to figger out why it didn't want to go into overdrive. Might be as simple as a bad solenoid.
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Old 08-16-2014, 02:01 PM
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I just got done replacing the solenoid and pressure sensors. After taking a bath in trans fluid, I drove it and still no overdrive. It shifts good in the other 3 gears, and the converter is locking up. Just no overdrive. I think im just gonna put a trans in it.
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Old 08-17-2014, 10:39 AM
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Make sure the PCM is actually requesting O/D first..... be absolutely certain the trans is the problem before replacing it.
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Old 08-17-2014, 11:18 AM
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Is a pinout for the pcm in the service manual? Could the speed sensor on the back of the trans cause a no overdrive situation? Does it matter that I can hit the od button on the shifter and the light goes on and off, but obviously no change in rpm. What about a trans temp sensor? I know it won't go into od if the pcm thinks the trans is to cold.
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Old 08-17-2014, 11:32 AM
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Service manual does indeed have connector pinouts.

Speed sensor on trans also drives the speedometer. If the PCM wasn't getting a signal from it, it would whine about it. (and you would also have other shifting issues.) Yours is a 98 though..... so, pretty good chance that the sensor on the trans is merely the 'output speed sensor', and PCM gets its cue for vehicle speed from the rear wheel speed sensor. (as would the speedo.) But, if the RWSS, and the OSS didn't agree, it should whine about that as well..... (though, it wouldn't be the first time the PCM didn't complain about something that was obviously 'not quite right'......)

O/D button just sends a signal to the PCM, PCM turns on the lite, and then simply won't ground the control circuit for the O/D solenoid.

Trans codes may not necessarily turn on the CEL. May not hurt to get the codes read, and see if anything interesting pops up.

Temp sensor may indeed be a problem. Only way to verify that though, is to be able to read real time data, and see what temp the PCM thinks the trans is. If it though the trans was overheating, it would turn on the trans temp light in the dash.

Think you need to be able to look at real time data here. Trans temp, is PCM actually requesting O/D, etc.
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Old 08-17-2014, 03:03 PM
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First, you are awesome lol. The second is my fault for not updating my sig, and it may not matter, but my truck is now a 2001 with a 360 and 46re. I scan the truck all the time, I never get any codes. Can I find the od pin on the pcm, backprobe the plug and manually apply power to the od wire while on the fly? That would at least tell me if the pcm is telling the trans to switch into overdrive right?
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Old 08-17-2014, 03:37 PM
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PCM controls the ground side of the circuit. The O/D, and TCC solenoids get power from the same source. (thick red wire on 8 pin connector.) If you test the wire, you will indeed see power there, provided the engine is running..... Question becomes, does the PCM actually GROUND the circuit? Would have to wire a test lite in line with the circuit. If the lite comes on, but, the trans don't shift..... either the solenoid is bad, or, you have bigger issues.
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Old 08-17-2014, 04:14 PM
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Ok, sounds like fun. Ill be able to get to do it tomorrow, ill let you know what happens.
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Old 08-17-2014, 04:51 PM
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Quote:
Originally Posted by 98beater View Post
Ok, sounds like fun. Ill be able to get to do it tomorrow, ill let you know what happens.

Backprobe the OD solenoid wire with a volt meter (on the Durango it was C2 pin 21 not sure if its the same on the ram) go for a drive... while in 1st, 2nd, and 3rd you should be getting 12+ volts. When the PCM commands OD it should read 0v. once it downshifts back you should have 12v again.

If that checks out okay then either your orifice filter in the overdrive piston housing is missing or the overdrive piston seals are bad.

Edit: just checked my 97 ram FSM and it says the OD solenoid is B21 (white connector), i assume its the same for 98.

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Old 08-17-2014, 05:33 PM
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You said the od light goes on and off ?, so is the od light blinking when you try and use od ?, if so, then the blinking od light is telling you that there is a problem some were, you just need to figure out what it is.
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Old 08-17-2014, 07:10 PM
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You said the od light goes on and off ?, so is the od light blinking when you try and use od ?, if so, then the blinking od light is telling you that there is a problem some were, you just need to figure out what it is.

I think he mean that the light goes on and off as he is pressing the OD off button... not that its blinking on its own.
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Old 08-17-2014, 07:26 PM
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Quote:
Originally Posted by HeyYou View Post
Service manual does indeed have connector pinouts.

Speed sensor on trans also drives the speedometer. If the PCM wasn't getting a signal from it, it would whine about it. (and you would also have other shifting issues.) Yours is a 98 though..... so, pretty good chance that the sensor on the trans is merely the 'output speed sensor', and PCM gets its cue for vehicle speed from the rear wheel speed sensor. (as would the speedo.) But, if the RWSS, and the OSS didn't agree, it should whine about that as well..... (though, it wouldn't be the first time the PCM didn't complain about something that was obviously 'not quite right'......)

O/D button just sends a signal to the PCM, PCM turns on the lite, and then simply won't ground the control circuit for the O/D solenoid.

Trans codes may not necessarily turn on the CEL. May not hurt to get the codes read, and see if anything interesting pops up.

Temp sensor may indeed be a problem. Only way to verify that though, is to be able to read real time data, and see what temp the PCM thinks the trans is. If it though the trans was overheating, it would turn on the trans temp light in the dash.

Think you need to be able to look at real time data here. Trans temp, is PCM actually requesting O/D, etc.
With the engine and transmisison fluid cold, disconnect the PCM connectors Terminal #1 of connector B (violet wire) is the trans temp signal. The terminal is numbered on the connectors. Find yourself a good ground. The resistance (thru the temp sensor) should be roughly 2000 ohms with the fluid basically at room temp. If the resistance is much higher than this, then the PCM is seeing a temp that is colder than normal; if the resistance is much less than this then the PCM thinks the temp is higher than normal.
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