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Discussion Starter #1
Hi Everyone,

I'm new here! Here's my situation. I have a 2004 Disco 2, remaned engine about 17,000 miles ago. Disco is running fine but now will not go into overdrive because of p0741 code of "Torque Converter Clutch, Low Performance, Stuck Off"; and p0734 "Gear 4 Incorrect Ratio."

I've had the transmission drained (which didn't look bad) and refilled twice with Castrol recommended ATF and added Lucas Slip Fix to the mix. I've driven it for the past week and no change. I'm thinking it's the solenoid but can't find a replacement solenoid anywhere. On the p0734 code, some links and threads here are pointing to replacing the MAF sensor.

Any thoughts or suggestions are greatly appreciated.
 

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Hi. Run a stall test on it and come back with the result... if you want the lock-up solenoid google out THT000010
 

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Discussion Starter #4
Sierrafery,

I haven't had a chance to do the stall test yet. Bitter cold spell here. Picked picked up a THT00010 shift solenoid for my mechanic to try next week. Do you know where this particular solenoid is located? Again, I have a 2004 Land Rover Discovery 2.

Thanks in advance for your help on this!
 

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I haven't had a chance to do the stall test yet.
Stall test may check the overall health of the TC, trans drive clutches and advise of reduced engine power but won't tell you anything thing about the LU clutch condition or operation. If no other engine or trans issues it may be a waste of time, it's not a regular mx item and probably not the best thing to put an aging trans through.
......
 

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Sierrafery,

I haven't had a chance to do the stall test yet. Bitter cold spell here. Picked picked up a THT00010 shift solenoid for my mechanic to try next week. Do you know where this particular solenoid is located? Again, I have a 2004 Land Rover Discovery 2.

Thanks in advance for your help on this!
Remove the valve block and the MV3 lock-up solenoid(THT000010) is on top, the first you see cos the others(MV1, 2) are beneath it, you can't reach them without removing MV3
 

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Discussion Starter #7 (Edited)
Okay folks,

I greatly appreciate your help already.

Here's a follow-up update on my codes or p0741 and p0734. As mentioned, the trans fluid has been changed 3 times, with new filters and Lucas additive. No change. I replaced the Lock Up Solenoid with a new LR solenoid but it had no effect. I still have the the p0741 trouble code and NO Overdrive.

I'm at a total loss of what to do next. Any help is greatly appreciated.

On the p0734 code, I replaced the MAF Sensor with a new Bosch and the code is gone. So it seems in some cases this does work.

Any more suggestions on the pesky p0741 code and NO Overdrive issue???
 

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Any more suggestions on the pesky p0741 code and NO Overdrive issue???
At predetermined speeds, the TCM will lock the converter clutch via the TCC solenoid; this occurs
in third and fourth gears thereby giving a direct drive through the transmission. Once the converter
is locked up, the TCM will compare the input speed and output speed of the transmission and
verify if the gear ratio is the same as the one stored internally.
CAUSE
TCC is not operating mechanically or has insufficient pressure to actuate. See mechanical diagnosis.
Incorrect input/output shaft speeds being sensed.
REPAIR
Transmission may need replacing.
Check input/output speed signals for correct operation.
Above quote from a RR trans manual and should apply. http://84.22.143.158/files/%D0%A0%D1%83%D0%BA%D0%BE%D0%B2%D0%BE%D0%B4%D1%81%D1%82%D0%B2%D0%B0/%D0%98%D0%BD%D0%BE%D0%BC%D0%B0%D1%80%D0%BA%D0%B8/Land%20Rover/Land%20Rover%204-speed%20Electronic%20Automatic%20Transmission%20System.pdf From looking, some of the things below may be possibilities, no order suggested. If you good at tech info you can read through the linked manual.
Since the solenoid didn't fix it you may want to do the stall test at some point.

I'd pull the electrical connectors to check and clean for starters.

1. Electrical issues, connectors or wiring you can troubleshoot using a meter.
2. Speed sensor?
3. Faulty TCM.
4. Bad TC LU clutch.
5. Fluid pump.
......
 

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PO0741 and PO734 - outcome

Can you let me know the outcome? I have the same issue - codes 0741 and 0734, which remain after several repairs:
1. cleaned sensor above MAF and replaced MAF
2. Checked battery - at about 12.4 at idle and 13.1 when revved. Alternator, when I checked the voltage at the - and + points had correct voltage at idle and when things like air, radio, and lights are turned on.
3. Changed transmission fluid, filter, added additive - I may need to re-check the level and add more
4. Changed temp regulator, radiator hoses, and fluid

*wondering what to do next:
1. for sure I'll check the fluid level and add if low
2. Do I change the **** control solenoid? Also noticed there is one other solenoid in the auto gearbox, not sure about that?
3. Do I mess with the XYZ switch? - the car after sitting will run fine for a short while then seems to go into limp mode, won't change to 4th gear/overdrive and doesn't go into reverse properly (it won't move then after a second or two will start to roll back almost as if it slowly entered reverse)

Also, I have the blinking odometer reading - we tow it behind our RV, when we do I leave it in key position I to avoid draining the battery on trips (aa (I also put the auto and transfer cases into neutral then start up the car and run through each gear every 100-150 miles).

Help would be greatly appreciated, I am about a month into this.
 

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2. Checked battery - at about 12.4 at idle and 13.1 when revved. Alternator, when I checked the voltage at the - and + points had correct voltage at idle and when things like air, radio, and lights are turned on.
I don't know if this is your issue but you do appear to have a battery/charging issue. Your numbers are low from my own.

Mine runs around 14.2 when under load and charging.
 

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I have the same issue - codes 0741 and 0734, which remain after several repairs:
1. cleaned sensor above MAF and replaced MAF
2. Checked battery - at about 12.4 at idle and 13.1 when revved. Alternator, when I checked the voltage at the - and + points had correct voltage at idle and when things like air, radio, and lights are turned on.
3. Changed transmission fluid, filter, added additive - I may need to re-check the level and add more
4. Changed temp regulator, radiator hoses, and fluid

*wondering what to do next:
1. for sure I'll check the fluid level and add if low
2. Do I change the **** control solenoid? Also noticed there is one other solenoid in the auto gearbox, not sure about that?
3. Do I mess with the XYZ switch? - the car after sitting will run fine for a short while then seems to go into limp mode, won't change to 4th gear/overdrive and doesn't go into reverse properly (it won't move then after a second or two will start to roll back almost as if it slowly entered reverse)

Also, I have the blinking odometer reading
For those fault codes you should go to what they mean and that's about the TCC lockup solenoid or it's circuit, the shift control solenoid has nothing to do with this... a common issue is chaffed gearbox loom where it passes above the transfer case
 
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