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code 740. HELP!

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Old 07-29-2014, 02:59 PM
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Default code 740. HELP!

1997 dodge in sig. 173k on her. getting code 740 still after replacing tps (bwd from oreillys) Replaced fluid, filter, governor pressure solenoid, tcc solenoid and wired a tcc manual switch up to try and ground wire b11 orange with black trace. I get no converter lockup on command. i ran a jumper wire and grounded it to the seat frame while driving and still nothing. It locks sometimes going up hills, or before replacing tps, it would cycle in and out of lockup on the highway. Im at a loss at this point. Should I be looking for a short to ground on the wire from the pcm to the trans? any help is appreciated.
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1997 Dodge ram 1500 5.2 156,000 miles
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Old 07-29-2014, 03:06 PM
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P0740 Torque Conv Clutch, No RPM Drop at Lockup

Check the connector at the trans, make sure it plugs in good.

When you ground the wire at B11, did you cut the wire, or simply splice into it? Are you sure you had a good ground??
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Old 07-31-2014, 08:15 AM
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I spliced into it with a wire tap and ran it in the truck, grounded to the seat frame, no change in rpm. When the converter decides itsgoing to lock sometimes (going up a hill) you can tell because if you tap the gas there's no 200 rpm jump. It's only at speeds around 45-60 where it will not lock, then on flat highway, you can tap the brakes and usually there's no rpm change so i verified its not even tring to lock up. on my way to work this morning, i tried holding up on the brake pedal because of the switch that releases the convertor on application of brakes. No real change either. Also, the black plastic on connector at trans was broken, so i pinned the wires directly to the ones coming from the tcc harness out of the trans, still no change.tcc is new.
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Old 07-31-2014, 09:04 AM
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I would suspect either a bad solenoid, or, failing torque converter then. (wouldn't be the first time I got a bad part, right out of the box.) If it was doing the same thing before the solenoid replacement.... I suspect your t/c is bad.

When you had the pan off, did you find anything untoward in the pan?
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Old 07-31-2014, 12:24 PM
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Nothing more than the usual clutch material on the magnet. a few chunks of what looked to be pieces of metal on it as well. Also a few months ago the truck was shifting into 2nd gear and staying there if you gave it any more than 1/3 throttle. Replacing the governor pressure solenoid that the screen was clogged with the same hunks of metal took care of that. Any opinions on dacco convertors? We use them at the ford dealership i work at for customer pay jobs, so that's probably the brand ill go with.

also nothing changed when i replaced the solenoid the first time.
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Old 07-31-2014, 12:36 PM
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I don't think much of the 80 dollar replacement converters. (dealer markup notwithstanding....) If there were metal shavings in the pan..... enough to clog the solenoid, you may have more issues than just the t/c. You may be able to replace it, and get away with it for a while, but, it is a gamble.
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Old 07-31-2014, 12:58 PM
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Im at the point now to where it's either by a converter or do a nv3500/4500 swap.
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Old 07-31-2014, 01:32 PM
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The manual swap may end up being cheaper in the long run.....
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Old 08-14-2014, 09:48 AM
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Update. pulled trans two days ago. Replaced front pump and converter with one from trans star. reset the front drum/band anchor in correct and put it all back together. Now my truck acts like it has a misfire. Starts in second gear and slips and jerks. I also should mention that the connector on the 8 pin plug is broken on the trans and i have all of the pins pinned directly together. Starts in second gear and shifts to third. Could it be the tv cable?
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Old 08-14-2014, 10:42 AM
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Unlikely.

Getting any trans codes? Did you damage the crank sensor doing the trans? They are frequent victims of such exercises.
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Old 08-14-2014, 10:50 AM
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would a bad governer pressure sol cause the shudder in 2nd? it only starts of in second or third gear. Possible clogged gov pressure solenoid? seems like limp mode.
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Old 08-14-2014, 10:54 AM
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Possibly. How many miles on the trans? Last time fluid/filter was changed?
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Old 08-14-2014, 01:22 PM
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a month ago when i put the governor pressure solenoid in i changed the fluid and filter. 178 on truck i believe. I got the chugging to stop at idle by connecting the #4 spark plug wire back to the distributor. It's amazing what youll miss at 3 am when puting something back together. I scanned the truck at lunch getting codes 753 and 1752. I'm thinkingthe pin are grounding out at the input on my trans. However I think the gov pressure solenoid took a crap with the new pump also.
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Old 08-14-2014, 01:48 PM
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P0753 Trans 3-4 Shift Sol/Trans Relay Circs

I can't find anything on 1752, but, I CAN find where folks have had readers give them that code in error......

I would be tempted to go to my local junk yard, and see if I could find another connector to splice in there...... or try and order one from someplace like LMC truck, or even the dealer if it came to that.
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Old 08-14-2014, 02:07 PM
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ive got another gov pressure solenoid from autozone today. do you happen to have a diagram of which pins go where? I'm just double checking where they go.
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Old 08-14-2014, 02:10 PM
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Grab the Factory Service manual. Connector pinouts are in there. (get it here.)
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Old 08-18-2014, 08:39 AM
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Reconnected all pins, cleaned gp sensor,replaced gov pressure solenoid. Still only 2nd and third gear. I've heard people saying that the 02 senors circuit is on the same circuit as the trans.Should i start there?
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Old 08-18-2014, 09:49 AM
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O2 sensors get power from the ASD relay. Only real commonality I can see is, both the ASD, and Trans control relay control circuits get their power from the same place. As the engine will start, and run..... I am thinking that side of things is OK.

Are you getting a good solid 12volts TO the transmission?

If the trans is in limp mode, there *should* be a code or two set.
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Old 08-18-2014, 12:29 PM
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yes, the same two codes as i had mentioned before. So i should be getting 12 volts on pin 2 on the harness (orange solid wire?) and yes the engine starts and runs fine.
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Old 08-18-2014, 12:50 PM
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have you tried a different code reader for that second one? (1752)
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Old 08-18-2014, 12:50 PM
 
 
 
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