stacked07

well sent trans out due to breaking anyway got back and installed but now I am getting a p1749 and 1754 when I turn on truck I clear codes and p1754 goes away but p1749 wont clear and keeps light on tried unplugging sensor and also disconnected batteries and powered back up turned key to on to let sensors set and the light wont clear due to p1749

no_6_oh_no

TV motor problem. Check connections, reset it, check operational specs.

P1749-TRANSMISSION THROTTLE VALVE POSITION SENSOR CIRCUIT LOW

The transmission throttle valve cable has been replace by the transmission throttle valve actuator (TTVA). The TTVA
consists of an electric DC motor, two potentiometers, and a gear drive system. The TTVA is mechanically connected
to the transmission throttle valve in the valve body by the “D” shaped opening in the bottom of the TTVA shaft.
The Transmission Throttle Valve Actuator (TTVA) does not require any mechanical adjustments. All changes in throttle
valve position are controlled by the Engine Control Module (ECM).
The TTVA does require an initialization period after the actuator has been removed or replaced. After the actuator
has been removed or replaced, move the ignition to the ON position for thirty (30) seconds. This will allow the ECM
sufficient time to perform the internal calibration procedures to learn the TTVA’s current “zero” position.
˛ When Monitored:
Continuously with the ignition on.
˛ Set Condition:
When the Engine Control Module (ECM) detects the monitored Transmission Throttle Valve Position Sensor
voltage drops below a predetermined value.
Possible Causes
(K312) TTVA POSITION SENSOR SIGNAL CIRCUIT OPEN
(K312) TTVA POSITION SENSOR SIGNAL CIRCUIT SHORT TO GROUND
(K312) TTVA POSITION SENSOR SIGNAL CIRCUIT SHORT TO ANOTHER CIRCUIT
(F856) 5 VOLT SUPPLY CIRCUIT OPEN
(F856) 5 VOLT SUPPLY CIRCUIT SHORT TO GROUND
(F856) 5 VOLT SUPPLY CIRCUIT SHORT TO ANOTHER CIRCUIT
TRANSMISSION THROTTLE VALVE ACTUATOR
ENGINE CONTROL MODULE

stacked07

tried resetting unless I am not doing right turn truck to on and wait 30 seconds right

no_6_oh_no

Yeah, thats what the FSM says. Probably a bad unit or bad connection. I would pull it again and check your connections and harness just to be sure.

stacked07

do you do the 30second thing with the connector on right

White97GTVert

Are you sure you got the right harness for the TS Shift master? Some of them went out with a bad harness that needed to be jumpered between pins 5 and 6 (if I remember correctly)

Look at the harness closest to the shift master and you shoiuld see a wire that is jumpering those two pins together. If not you have the wrong harness and just need to call them and they'll send yoiu a new one.

If the shift master was in before you put the tranny in (like on your old one) then I'm not sure what the issue is.

When we first put the shfit master on my truck, with the bad harness, it did those same exact codes.

You can put your wiring back to stock till you get a new harness if thats the cause.

stacked07

no the shift master was in i broke a intermedite shaft at the track so sent trans back to HTS now i have issue but one thing i thought of is my son turned the truck on and tried to start with no tranny in but batteries were still hooked up wonder if that faulted computer

White97GTVert

I was able to clear those codes with my smarty so not sure what the heck is going on with your truck. Sorry bud!

stacked07

yeah my smarty clears but comes right back

CButler610

How does the truck shift? Normal? If you disconnect the harness to the TTVA, does it shift different?

Dusty and I went through this with my truck. I even purchased a brand new TTVA. It ended up being a fried ECM. I hope you have better luck than I did. $$$$$

TX_Diesel

CButler610,

how did you figure out your ECM was fried?

dejaybailey

Having the same issue....

Transmission # 9

Anyone figure out how to diag the ECM ?

I already replaced the TTVA

Still does not lock up in second and third between 20 and 30MPH

dejaybailey

How much was your ECM ?