So I just got done swapping out 46re's from my 98 1500 2wd truck with a 96 46re. While everything works great, the only problem I still have is the torque converter won't lock up. The interesting thing is I had the same problem with the old transmission. The transmission does go into od and the check engine light is not on. Also, I tried grounding the orange and black wire that is for the lock up but still nothing. Could it be the wire or plug going into the tranny is messed up or might it be a complete coincidence?

 

You got me on that one. For ****s and giggles, swap out the trans relay under the hood with another like it. If that doesn't fix it, time to take out the wiring diagrams to trace the positive power. Are you throwing a cel?

 

Bear in mind I am looking at the 01 wiring diagram.... not sure if anything changed between the 98, and this one......

It looks like the TCC solenoid is fed power from a common source, Fuse I in the PDC, thru a PCM controlled relay. As everything is working properly up to TCC lock, I am going to assume that part is working correctly.

It appears that you should have 12 volts on your Orange/black wire whenever engine is running, and PCM grounds the wire to engage TCC..... Do you indeed HAVE 12 volts on that wire?

 

NO 3-4 UPSHIFT
1. O/D Switch In OFF Position. 1. Turn control switch to ON position.
2. Overdrive Circuit Fuse Blown. 2. Replace fuse. Determine why fuse failed
and repair as necessary (i.e., shorts or
grounds in circuit).
3. O/D Switch Wire Shorted/Open
Cut.
3. Check wires/connections with 12V test
lamp and voltmeter. Repair damaged or
loose wire/connection as necessary.
4. Distance or Coolant Sensor
Malfunction.
4. Check with DRBT scan tool and repair or
replace as necessary.
5. TPS Malfunction. 5. Check with DRBT scan tool and replace
if necessary.
6. Neutral Sense to PCM Wire
Shorted/Cut.
6. Test switch/sensor as described in
service section and replace if necessary.
Engine no start.
7. PCM Malfunction. 7. Check with DRBT scan tool and replace
if necessary.
8. Overdrive Solenoid Shorted/Open. 8. Replace solenoid if shorted or open and
repair loose or damaged wires (DRBT scan
tool).
9. Solenoid Feed Orifice in Valve
Body Blocked.
9. Remove, disassemble, and clean valve
body thoroughly. Check feed orifice.
10. Overdrive Clutch Failed. 10. Disassemble overdrive and repair as
needed.
11. Hydraulic Pressure Low. 11. Pressure test transmission to determine
cause.
12. Valve Body Valve Stuck. 12. Repair stuck 3-4 shift valve, 3-4 timing
valve.
13. O/D Piston Incorrect Spacer. 13. Remove unit, check end play and install
correct spacer.
14. Overdrive Piston Seal Failure. 14. Replace both seals.
15. O/D Check Valve/Orifice Failed. 15. Check for free movement and secure
assembly (in piston retainer). Check ball
bleed orifice.

 

well I disconnected the round 8pin connector from the trans and grounded the orange and black wire by the dash(the one I used to try to force the tq to lock up) and it is indeed grounded by the plug. This leads me to assume that the wiring in the truck is all fine. Also, I scanned for any codes and none showed up. I just can't see how there would be no codes if the lockup isn't working.

 

My truck didn't throw any codes when the TCC crapped out on me. Took it out, but a brand new one in and haven't had any issue's since. Is your CEL light working or is it burnt out?

 

Yea the check engine light works because when I turn the key on it lights up for a se ond and my code reader doesn't show any codes. I just find out hard to believe both trannys would do the exact same thing which is why it leads me to believe that it is actually something with the truck.

 

It's always the posts that have identical symptoms to mine where a solution\cause is never found or updated in the post.

 

Has anyone ever found a fix for the torque converter not locking up? My 2001 ram 1500 has just developed this problem. The tranny doesn't even give a hint that it's trying to lock up the converter. The truck goes through all the gears fine , and overdrive works. Please help before I take it into a tranny shop and they charge me 2Gs for something I could've fixed myself .

 

Getting any codes for anything? PCM should whine about not seeing RPM drop when it commands TCC engage.