banshee Posted March 15, 2016 Share Posted March 15, 2016 Gents Changed tps, changed tcu out of a running driving shifting truck, same problem it simply will not shift out of low hear, what am I missing??? Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 15, 2016 Share Posted March 15, 2016 Did you try the manual shifting test by disconnecting the TCU and shifting through the gears with the shifter? Link to comment Share on other sites More sharing options...
LarryH88bt Posted March 15, 2016 Share Posted March 15, 2016 Did you adjust the TPS to the correct volt range? There are two adjustments, one for idle, one for the transmission. Link to comment Share on other sites More sharing options...
Dando Posted March 15, 2016 Share Posted March 15, 2016 TCU fuse under passenger dash? Link to comment Share on other sites More sharing options...
75sv1 Posted March 15, 2016 Share Posted March 15, 2016 First check fluid level. Then do as suggested, unplug the TCU. Not sure what year you have. Then shift manually as suggested. If it shifts OK manually, with the TCU unplugged, then its electronic. If reverse works, then its probably electronic. Then I'd check the solenoids, three of them. I don't have the pin or plug call outs. But should be able to check them from the TCU plug. Also, check the speed sensors if you can. The Solenoids should be 13 ohms +/- 3 ohms. Link to comment Share on other sites More sharing options...
banshee Posted March 16, 2016 Author Share Posted March 16, 2016 Thanks for the help so far but dose anyone have the wire diagram of the tcu? Thinking I have another problem it's not being ALOUD to shift Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 16, 2016 Share Posted March 16, 2016 The TCU pinouts changed slightly throughout the years. Since you didn't mention what year your rig is, which wiring harness you are using, or what the "running driving shifting truck" is who knows what you have? You need all this information, then you will need to match your harness connector to the TCU pin-by-pin for it to play correctly. Link to comment Share on other sites More sharing options...
75sv1 Posted March 16, 2016 Share Posted March 16, 2016 If the fluid level is correct then I'd unplug the TCU and drive it in manual mode. If the trans shifts manually, then its electronics. I usually measure the Ohms for the solenoids at the plug up by the trans fill tube. They should be 13 ohms +/-3 ohms. If you need help, I might be in Indy on Saturday evening. Link to comment Share on other sites More sharing options...
banshee Posted March 17, 2016 Author Share Posted March 17, 2016 Update unplugged tcu and if I manually shift it shifts Link to comment Share on other sites More sharing options...
cruiser54 Posted March 17, 2016 Share Posted March 17, 2016 Update unplugged tcu and if I manually shift it shifts See Tip 10 at www.cruiser54.com You changed TCUs, but how's the fuse in the harness right by it? Link to comment Share on other sites More sharing options...
deziped1 Posted March 17, 2016 Share Posted March 17, 2016 nd then tighten to spec, which isn't much in aluminum. hope this helps That's all that's left of a paragraph. Who knows where the hell it went! Link to comment Share on other sites More sharing options...
75sv1 Posted March 17, 2016 Share Posted March 17, 2016 Update unplugged tcu and if I manually shift it shifts OK, then its an electrical problem. I have only dealt with a '98. So a lot different wiring if yours is a Renix era. I think the HO (90-95) is a bit different. Cruiser's tips are the main source for Renix info. If you can find were to measure the ohms to the solenoids, then measure them. Usually the middle one goes bad. Mine was, and the Transgo instructions stated it usually is. On mine one of the speed sensors was bad. The early ones might only have one speed sensor. The TPS, ECM and brake light switch also have input to the trans. Also, make sure your battery is in good condition. If it is a solenoid, you have two PnPs in Indy. Its been a month or two since I've been to them. There were two '00 or '01 XJs at the one on Producers lane. I did pick the solenoids and speed sensors from the trans laying out. The latter, greenish blue solenoids are suppose to be better than the brownish tan ones. I do have some brownish tan ones as spares. I'd have to see if I have some of the latter ones I can spare. They guy who bought my other XJ didn't pick up a trans I have. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 17, 2016 Share Posted March 17, 2016 Check the connectors in tip 10. That's the same place you're gonna end up testing solenoids anyway. Link to comment Share on other sites More sharing options...
banshee Posted March 18, 2016 Author Share Posted March 18, 2016 Did you try the manual shifting test by disconnecting the TCU and shifting through the gears with the shifter?Ok yes with the tcu unplugged it shifted when I changed gear with gearshiftNow what?? Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 18, 2016 Share Posted March 18, 2016 Did you try the manual shifting test by disconnecting the TCU and shifting through the gears with the shifter?Ok yes with the tcu unplugged it shifted when I changed gear with gearshiftNow what?? The TCU pinouts changed slightly throughout the years. Since you didn't mention what year your rig is, which wiring harness you are using, or what the "running driving shifting truck" is who knows what you have? You need all this information, then you will need to match your harness connector to the TCU pin-by-pin for it to play correctly. Link to comment Share on other sites More sharing options...
banshee Posted March 18, 2016 Author Share Posted March 18, 2016 Did you try the manual shifting test by disconnecting the TCU and shifting through the gears with the shifter?Ok yes with the tcu unplugged it shifted when I changed gear with gearshiftNow what?? The TCU pinouts changed slightly throughout the years. Since you didn't mention what year your rig is, which wiring harness you are using, or what the "running driving shifting truck" is who knows what you have? You need all this information, then you will need to match your harness connector to the TCU pin-by-pin for it to play correctly. Both 87 both 4.0L with aw4's Link to comment Share on other sites More sharing options...
banshee Posted March 20, 2016 Author Share Posted March 20, 2016 Update had to stop and replace Ujoint more testing starts in the morning, guys thanks for all your feedback and help Link to comment Share on other sites More sharing options...
banshee Posted March 23, 2016 Author Share Posted March 23, 2016 Hay guys thanks 4 all your input and excellent advice, after tires put back with pinion bearings replaced shifts just like it always did, new TPS good as new Again thanks a ton... Link to comment Share on other sites More sharing options...
cruiser54 Posted March 23, 2016 Share Posted March 23, 2016 So you had a bum replacement tPS? Link to comment Share on other sites More sharing options...
banshee Posted March 24, 2016 Author Share Posted March 24, 2016 So you had a bum replacement tPS?No I had a bum TPS connector, removed, cleaned with contact cleaner plugged back in reinstalled my old TPS, and TCU shifts fine, going to try and adjust later in the week, shift points are way off, again thanks a ton Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 24, 2016 Share Posted March 24, 2016 Did you try adjusting your throttle valve (TV) cable? Link to comment Share on other sites More sharing options...
cruiser54 Posted March 24, 2016 Share Posted March 24, 2016 A bad connector. Imagine that!!! LOL. Remember to adjust the tPS on the Engine side. Link to comment Share on other sites More sharing options...
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