still having tranny problems
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Red wire from the relay that his hot with the key on. You must check for power at this wire to verify that the relay is in fact working.
Power is then routed to the PCM through 2 separate wires at the main connector to the computer.
Power also goes directly from the relay to the solenoid body.
All the wires mentioned are read and draw power from the same location at the ECM relay. If one is hot (has 12v power), they should all be hot.
One final place to look is the bulkhead connector on the passenger side of the transmission.
You MUST NOT use a screw driver to unplug this connector. There is a locking tab that you push with your thumb while pulling up on the wires.
Inspect this connector for any signs of dirt, moisture, or corrosion. Also verify that the locking tab is still in tact and the connector can fully lock in place.
Power is then routed to the PCM through 2 separate wires at the main connector to the computer.
Power also goes directly from the relay to the solenoid body.
All the wires mentioned are read and draw power from the same location at the ECM relay. If one is hot (has 12v power), they should all be hot.
One final place to look is the bulkhead connector on the passenger side of the transmission.
You MUST NOT use a screw driver to unplug this connector. There is a locking tab that you push with your thumb while pulling up on the wires.
Inspect this connector for any signs of dirt, moisture, or corrosion. Also verify that the locking tab is still in tact and the connector can fully lock in place.
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Senior User
Joined: Nov 2006
Posts: 368
Likes: 0
From: s.e. wisconsin
i do have power at the relay i think the computer is junk i pulled it out today and it looks like it got wet the plug on the passanger side of my tranny plugs in all the way and is clean but the tab is broke
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Well a dead computer would produce those symptoms. What does the computer connector look like? Its a long shot, but if that has any corrosion in it you might be able to get it working again as long as there isn't major internal corrosion.
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Senior User
Joined: Nov 2006
Posts: 368
Likes: 0
From: s.e. wisconsin
the computer connecter looks fine i have to work today so a friend of mine is going to pull a couple computers from the junk yard for me and ill switch them out when i get off work
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
The way the electronics are set up in this transmission, the power wire in, and the soleniods are always hot, with the PCM completing the circuit internally at the correct moment to manage shift points.
This means that the solenoid body and soleniods should always have 12V power when ever the ignition is on.
Were you able to trace the 12V power to the solenoid pack?
This page has a diagram of the solenoid body electrical connector complete with a chart to show which wire does what:
http://www.tciauto.com/Products/Inst...part_one_2.htm
Pin #1 (red) is where 12V should be found with the ignition on.
What you can also do to verify that the soleniods are good, but taking a olm meter and meauring the resistance between the solenoid wires, and the 12 power wire. You are looking for 20k-30k olms.
This means that the solenoid body and soleniods should always have 12V power when ever the ignition is on.
Were you able to trace the 12V power to the solenoid pack?
This page has a diagram of the solenoid body electrical connector complete with a chart to show which wire does what:
http://www.tciauto.com/Products/Inst...part_one_2.htm
Pin #1 (red) is where 12V should be found with the ignition on.
What you can also do to verify that the soleniods are good, but taking a olm meter and meauring the resistance between the solenoid wires, and the 12 power wire. You are looking for 20k-30k olms.
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Senior User
Joined: Nov 2006
Posts: 368
Likes: 0
From: s.e. wisconsin
ok let me start off by saying thank you and dave i owe you a beer or something i got the truck fixed tonight with out all the info from you dave i dont know if i would have figured it out i checked the relays and they all had power on one pin i started checking wires and one of the red ones didnt have power so i started checking plugs and the fuse box and i found that a fuse was blown put a new one in and all is good what i think happend is the computer got wet and thats why it would shift funny and then it finally blew the fuse a new computer and a new fuse and it shifts!!!!!!!!!!!!!!!!
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Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Hey, no problem thats why this forum is here. I was in trouble my fair share and these guys saved my bacon on many occasions.
Although I do feel a little silly not asking about fuses. I assumed that since you checked the relays that fuses were ok too. But I figured it had to be a power supply problem so at least the method I gave you pointed you in the general direction.
Glad you got if fixed, and points for letting us know what it was. Gotta love it when you are able to pick apart and understand the fault so completely like this. Do you know how the water got inside in the first place?
Although I do feel a little silly not asking about fuses. I assumed that since you checked the relays that fuses were ok too. But I figured it had to be a power supply problem so at least the method I gave you pointed you in the general direction.
Glad you got if fixed, and points for letting us know what it was. Gotta love it when you are able to pick apart and understand the fault so completely like this. Do you know how the water got inside in the first place?
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Senior User
Joined: Nov 2006
Posts: 368
Likes: 0
From: s.e. wisconsin
i do not know how the water got in i didnt think to check the fuse because when it first started acting up it would shift funny and miss gears and my tach worked then one day all i had was 2nd and overdrive and my tach didnt work after replacing the range sensor tach sensor and fipl sensor i knew it had to be someting stupid i am pissed and happy all at the same time i spent around $250 on parts i didnt need and all it was was a $0.20 fuse but i am happy its fixed when i replaced the fuse i heard a relay click and was like no way checked the red wire for power and the test light lit up pluged everything back in backed the truck out of the shop stood on it and smoked the tires and my friend was like i think its fixed haha
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Senior User
Joined: Nov 2006
Posts: 368
Likes: 0
From: s.e. wisconsin
Ok everything was great for the past couple days i just ran to lunch and my truck started shifting funny now i have 2nd and od agian and the fuse isnt blown wtf? The od light isnt lit up either are the soulenoids junk?
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Its extremely unlikely for both solenoids to fail at the same time, so I think this is still a power supply problem. Have you looked at the PCM for signs of water again? What about your tachometer? Is that dead again too?
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Senior User
Joined: Nov 2006
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From: s.e. wisconsin
tach is good yet i switched the computer again (got 2 from the junk yard) the one i put in the other night had no signs of getting wet when i started it this morning to go to work it ran out in first gear till i let off a little then it shifted to od but was fine after that did the same thing at lunch then it started searching for gears but then stopped shifting all together i had to manualy shift from 2nd to od after work it was fine for most of the way home then just 2nd and od i stopped up at a bike show after work and after that the batteries were dead i got a jump and right off the bat 2nd and od when i got home i shut the truck off but left the key on and there was a clicking noise coming from the tranny i turned the key off and i thought i could hear a buzzing (my hearing isnt the best too much running the concrete saw with out earplugs) but anyways i turned the key back on and i could hear the clicking again coming from the tranny i checked the fuse every time and it was good i switched the relay thinking maybe it got warm and wouldnt work but still no change i am stumped
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Only thing left I can suggest is to remove all of the harness for the transmission (there should be quick connects), and inspect everything for signs of damage, crimps, pinches, or anyithing that could cause this.
Also, once again try and trace power to the solenoid body, and verify that the connector is properly plugged in if the locking tab is broken. Is the heat shield still in tact next to this connector?
Also, once again try and trace power to the solenoid body, and verify that the connector is properly plugged in if the locking tab is broken. Is the heat shield still in tact next to this connector?
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Senior User
Joined: Nov 2006
Posts: 368
Likes: 0
From: s.e. wisconsin
last night is started shifting fine again and i didnt get a chance to look at the harness but thismorning it was searching for gears again going from od to d and when it would do that the od light would flash