I have a 05 dodge ram 2500 that is getting a code p1754 that I had posted before, I took it to a transmission shop and he said it could be like a dozen things that could cause that code which is a transmission throttle acuatter valve stuck is this true or does the valve just need to bereplaced. Thanks
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transmission throttle acuatter valve
- Thread starter jeremymarsh
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Here ya go :
P1754-TRANSMISSION THROTTLE VALVE ACTUATOR STUCK
Theory of Operation
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.
Set Condition:
The monitored TTVA position sensor does not indicate a change in position when the TTVA is commanded to change the position.
Possible Causes
(F856) 5 VOLT SUPPLY CIRCUIT OPEN
(K314) TTVA MOTOR (+) CIRCUIT OPEN
(K315) TTVA MOTOR (-) CIRCUIT OPEN
(K314) TTVA MOTOR (+) CIRCUIT SHORT TO GROUND
(K315) TTVA MOTOR (-) CIRCUIT SHORT TO GROUND
(K314) TTVA MOTOR (+) CIRCUIT SHORT TO VOLTAGE
(K315) TTVA MOTOR (-) CIRCUIT SHORT TO VOLTAGE
(K314) TTVA MOTOR (+) CIRCUIT SHORT TO ANOTHER CIRCUIT
(K315) TTVA MOTOR (-) CIRCUIT SHORT TO ANOTHER CIRCUIT
TRANSMISSION THROTTLE VALVE COMPONENTS
TRANSMISSION THROTTLE VALVE ACTUATOR
ENGINE CONTROL MODULE
Did the DTC reset?
Yes
Go To 2
No
Go To 16
2. CHECK THE TTVA POSITIONS WITH THE AUTO ZERO FEATURE
NOTE: Each time the ignition is cycled to the on position, the ECM commands a TTVA internal calibration procedure (autozero) to determine the zero position.
1. With the scan tool, monitor the TTVA position during the autozero test.
2. Ignition on, engine not running.
3. After the autozero test is completed, record the position percentage value.
4. Press and hold the accelerator pedal to full throttle after completion of the autozero test and record.
5. Subtract the TTVA full throttle value from the value recorded after the autozero test.
Is the difference between the two values greater than or equal to 48 degrees?
Yes
Go To 16
No
Go To 3
3. CHECK TTVA FOR SIGNS OF DAMAGE
1. Turn the ignition off to the lock position.
2. Visually inspect the TTVA shaft for any signs of external damage or improperly mounted.
NOTE: It is not necessary to remove the TTVA to perform this procedure.
3.
Is the TTVA damaged or improperly mounted?
Yes
Repair as necessary.
Go To 4
4. CHECK THE TTVA POSITIONS WITH THE TTVA REMOVED
1. Turn the ignition off to the lock position.
2. Remove the TTVA from the transmission per the Service Information. (Refer to 21 - Transmission and Transfer Case/Automatic - 48RE/ACTUATOR, Throttle Valve - Removal)
NOTE: Check connectors - Clean/repair as necessary.
NOTE: Each time the ignition is cycled to the on position, the ECM commands a TTVA internal calibration procedure (autozero) to determine the zero position.
3. Properly support the TTVA and reconnect the TTVA wiring harness.
4. With the scan tool, monitor the TTVA position during the autozero test.
5. Ignition on, engine not running.
6. After the autozero test is completed, record the position percentage value.
7. After recording the position percentage value, press and hold the accelerator pedal to full throttle and note position percentage value.
8. Subtract the TTVA full throttle value from the value recorded after the autozero test.
Is the difference between the two values greater than or equal to 48 degrees?
Yes
Repair internal transmission as necessary. Refer to the Service Information for proper repair procedures for components related to the Transmission Throttle Valve.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
No
Go To 5
5. CHECK THE TTVA
1. Turn the ignition off to the lock position.
2. Disconnect the TTVA harness connector
3. Connect a 12-volt test light between the (K314) TTVA Motor (+) circuit and the (K315) TTVA Motor (-) circuit in the TTVA harness connector.
4. Monitor the test light in the following step.
NOTE: The test light should momentarily flash brightly, one time, immediately after the ignition is turned to the on position.
5. Ignition on, engine not running.
Did the test light illuminate brightly one time after turning the ignition to the on position?
Yes
Go To 6
No
Go To 7
6. CHECK THE (K315) TTVA MOTOR (-) CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between ground and the (K315) TTVA Motor (-) circuit.
Is the resistance below 5. 0 ohms?
Yes
Repair the (K315) TTVA Motor (-) circuit for a short to ground.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
No
Replace the TTVA per the Service Information (Refer to 21 - Transmission and Transfer Case/Automatic - 48RE/ACTUATOR, Throttle Valve - Removal)
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
7. CHECK THE (F856) 5 VOLT SUPPLY CIRCUIT FOR AN OPEN
1. Turn the ignition off to the lock position.
2. Disconnect the ECM C1 and C2 harness connectors.
3. Measure the resistance of the (F856) 5-volt Supply circuit between the ECM C2 harness connector and the TTVA harness connector.
Is the resistance below 5. 0 ohms?
Yes
Go To 8
No
Repair the (F856) 5-volt Supply circuit for an open.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
8. CHECK THE (K314) TTVA MOTOR (+) CIRCUIT FOR AN OPEN
1. Measure the resistance of the (K314) TTVA Motor (+) circuit between the ECM C1 harness connector and the TTVA harness connector.
Is the resistance below 5. 0 ohms?
Yes
Go To 9
No
Repair the (K314) TTVA Motor (+) circuit for an open.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
9. CHECK THE (K315) TTVA MOTOR (-) CIRCUIT FOR AN OPEN
1. Measure the resistance of the (K315) TTVA Motor (-) circuit between the ECM C1 harness connector and the TTVA harness connector.
Is the resistance below 5. 0 ohms?
Yes
Go To 10
No
Repair the (K315) TTVA Motor (-) circuit for an open.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
10. CHECK THE (K314) TTVA MOTOR (+) CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (K314) TTVA Motor (+) circuit.
Is the resistance below 5. 0 ohms?
Yes
Repair the (K314) TTVA Motor (+) circuit for a short to ground.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
No
Go To 11
11. CHECK THE (K314) TTVA MOTOR (+) CIRCUIT FOR A SHORT TO VOLTAGE
1. Ignition on, engine not running.
2. Measure the voltage of the (K314) TTVA Motor (+) circuit.
3.
Is the voltage above 0. 5 volts?
Yes
Repair the (K314) TTVA Motor (+) circuit for a short to voltage.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
No
Go To 12
12. CHECK THE (K315) TTVA MOTOR (-) CIRCUIT FOR A SHORT TO VOLTAGE
1. Measure the voltage of the (K315) TTVA Motor (-) circuit.
Is the voltage above 0. 5 volts?
Yes
Repair the (K315) TTVA Motor (-) circuit for a short to voltage.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
No
Go To 13
13. CHECK THE (K314) TTVA MOTOR (+) CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
1. Turn the ignition off to the lock position.
2. Measure the resistance between the (K314) TTVA Motor (+) circuit and every other circuit in the ECM C1 and C2 harness connectors
Is the resistance below 5. 0 ohms between the (K314) TTVA Motor (+) circuit and any other circuit in the ECM C1 and C2 harness connectors?
Yes
Repair the (K314) TTVA Motor (+) for a short to another circuit(s).
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
No
Go To 14
14. CHECK THE (K315) TTVA MOTOR (-) CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
1. Measure the resistance between the (K315) TTVA Motor (-) circuit and every other circuit in the ECM C1 and C2 harness connectors
Is the resistance below 5. 0 ohms between the (K315) TTVA Motor (-) circuit and any other circuit in the ECM C1 and C2 harness connectors?
Yes
Repair the (K315) TTVA Motor (-) for a short to another circuit(s).
P1754-TRANSMISSION THROTTLE VALVE ACTUATOR STUCK
Theory of Operation
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.
Set Condition:
The monitored TTVA position sensor does not indicate a change in position when the TTVA is commanded to change the position.
Possible Causes
(F856) 5 VOLT SUPPLY CIRCUIT OPEN
(K314) TTVA MOTOR (+) CIRCUIT OPEN
(K315) TTVA MOTOR (-) CIRCUIT OPEN
(K314) TTVA MOTOR (+) CIRCUIT SHORT TO GROUND
(K315) TTVA MOTOR (-) CIRCUIT SHORT TO GROUND
(K314) TTVA MOTOR (+) CIRCUIT SHORT TO VOLTAGE
(K315) TTVA MOTOR (-) CIRCUIT SHORT TO VOLTAGE
(K314) TTVA MOTOR (+) CIRCUIT SHORT TO ANOTHER CIRCUIT
(K315) TTVA MOTOR (-) CIRCUIT SHORT TO ANOTHER CIRCUIT
TRANSMISSION THROTTLE VALVE COMPONENTS
TRANSMISSION THROTTLE VALVE ACTUATOR
ENGINE CONTROL MODULE
Did the DTC reset?
Yes
Go To 2
No
Go To 16
2. CHECK THE TTVA POSITIONS WITH THE AUTO ZERO FEATURE
NOTE: Each time the ignition is cycled to the on position, the ECM commands a TTVA internal calibration procedure (autozero) to determine the zero position.
1. With the scan tool, monitor the TTVA position during the autozero test.
2. Ignition on, engine not running.
3. After the autozero test is completed, record the position percentage value.
4. Press and hold the accelerator pedal to full throttle after completion of the autozero test and record.
5. Subtract the TTVA full throttle value from the value recorded after the autozero test.
Is the difference between the two values greater than or equal to 48 degrees?
Yes
Go To 16
No
Go To 3
3. CHECK TTVA FOR SIGNS OF DAMAGE
1. Turn the ignition off to the lock position.
2. Visually inspect the TTVA shaft for any signs of external damage or improperly mounted.
NOTE: It is not necessary to remove the TTVA to perform this procedure.
3.
Is the TTVA damaged or improperly mounted?
Yes
Repair as necessary.
Go To 4
4. CHECK THE TTVA POSITIONS WITH THE TTVA REMOVED
1. Turn the ignition off to the lock position.
2. Remove the TTVA from the transmission per the Service Information. (Refer to 21 - Transmission and Transfer Case/Automatic - 48RE/ACTUATOR, Throttle Valve - Removal)
NOTE: Check connectors - Clean/repair as necessary.
NOTE: Each time the ignition is cycled to the on position, the ECM commands a TTVA internal calibration procedure (autozero) to determine the zero position.
3. Properly support the TTVA and reconnect the TTVA wiring harness.
4. With the scan tool, monitor the TTVA position during the autozero test.
5. Ignition on, engine not running.
6. After the autozero test is completed, record the position percentage value.
7. After recording the position percentage value, press and hold the accelerator pedal to full throttle and note position percentage value.
8. Subtract the TTVA full throttle value from the value recorded after the autozero test.
Is the difference between the two values greater than or equal to 48 degrees?
Yes
Repair internal transmission as necessary. Refer to the Service Information for proper repair procedures for components related to the Transmission Throttle Valve.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
No
Go To 5
5. CHECK THE TTVA
1. Turn the ignition off to the lock position.
2. Disconnect the TTVA harness connector
3. Connect a 12-volt test light between the (K314) TTVA Motor (+) circuit and the (K315) TTVA Motor (-) circuit in the TTVA harness connector.
4. Monitor the test light in the following step.
NOTE: The test light should momentarily flash brightly, one time, immediately after the ignition is turned to the on position.
5. Ignition on, engine not running.
Did the test light illuminate brightly one time after turning the ignition to the on position?
Yes
Go To 6
No
Go To 7
6. CHECK THE (K315) TTVA MOTOR (-) CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between ground and the (K315) TTVA Motor (-) circuit.
Is the resistance below 5. 0 ohms?
Yes
Repair the (K315) TTVA Motor (-) circuit for a short to ground.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
No
Replace the TTVA per the Service Information (Refer to 21 - Transmission and Transfer Case/Automatic - 48RE/ACTUATOR, Throttle Valve - Removal)
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
7. CHECK THE (F856) 5 VOLT SUPPLY CIRCUIT FOR AN OPEN
1. Turn the ignition off to the lock position.
2. Disconnect the ECM C1 and C2 harness connectors.
3. Measure the resistance of the (F856) 5-volt Supply circuit between the ECM C2 harness connector and the TTVA harness connector.
Is the resistance below 5. 0 ohms?
Yes
Go To 8
No
Repair the (F856) 5-volt Supply circuit for an open.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
8. CHECK THE (K314) TTVA MOTOR (+) CIRCUIT FOR AN OPEN
1. Measure the resistance of the (K314) TTVA Motor (+) circuit between the ECM C1 harness connector and the TTVA harness connector.
Is the resistance below 5. 0 ohms?
Yes
Go To 9
No
Repair the (K314) TTVA Motor (+) circuit for an open.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
9. CHECK THE (K315) TTVA MOTOR (-) CIRCUIT FOR AN OPEN
1. Measure the resistance of the (K315) TTVA Motor (-) circuit between the ECM C1 harness connector and the TTVA harness connector.
Is the resistance below 5. 0 ohms?
Yes
Go To 10
No
Repair the (K315) TTVA Motor (-) circuit for an open.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
10. CHECK THE (K314) TTVA MOTOR (+) CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (K314) TTVA Motor (+) circuit.
Is the resistance below 5. 0 ohms?
Yes
Repair the (K314) TTVA Motor (+) circuit for a short to ground.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
No
Go To 11
11. CHECK THE (K314) TTVA MOTOR (+) CIRCUIT FOR A SHORT TO VOLTAGE
1. Ignition on, engine not running.
2. Measure the voltage of the (K314) TTVA Motor (+) circuit.
3.
Is the voltage above 0. 5 volts?
Yes
Repair the (K314) TTVA Motor (+) circuit for a short to voltage.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
No
Go To 12
12. CHECK THE (K315) TTVA MOTOR (-) CIRCUIT FOR A SHORT TO VOLTAGE
1. Measure the voltage of the (K315) TTVA Motor (-) circuit.
Is the voltage above 0. 5 volts?
Yes
Repair the (K315) TTVA Motor (-) circuit for a short to voltage.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
No
Go To 13
13. CHECK THE (K314) TTVA MOTOR (+) CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
1. Turn the ignition off to the lock position.
2. Measure the resistance between the (K314) TTVA Motor (+) circuit and every other circuit in the ECM C1 and C2 harness connectors
Is the resistance below 5. 0 ohms between the (K314) TTVA Motor (+) circuit and any other circuit in the ECM C1 and C2 harness connectors?
Yes
Repair the (K314) TTVA Motor (+) for a short to another circuit(s).
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure)
No
Go To 14
14. CHECK THE (K315) TTVA MOTOR (-) CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
1. Measure the resistance between the (K315) TTVA Motor (-) circuit and every other circuit in the ECM C1 and C2 harness connectors
Is the resistance below 5. 0 ohms between the (K315) TTVA Motor (-) circuit and any other circuit in the ECM C1 and C2 harness connectors?
Yes
Repair the (K315) TTVA Motor (-) for a short to another circuit(s).
Probably not the actuator..........its never the easy fix it seems
OK I took it to another shop and they got to codes a PO1754 and 1751 Throttle valve actuator low voltage and actuator stuck so now what the heck they said that the valve body on the inside of the transmission could be sticking and that's scary cause that could get expensive anybody have any ideas out there. Does anyone know if I had it in for a transmission service would they be able to check that valve body or would they have to dig further. Thanks
Low voltage at the actuator would probably cause it to seem to be stuck. Might be as simple as a bad connection on the TTVA motor itself. I would start be cleaning and restting all the electrical connections on the transmission, they all feed the TCM so it could be in a related connector.
The TTVA runs the throttle valve on the VB just like the TV cable used to do. The throttle valve in the VB has habit of wearing a rim in it that could cause it to stick and that would likely cause the TTVA to throw the stuck code. Pretty simple fix with the repair kit from Sonnax.
Last but not least, the ECU may have a bad driver for the TTVA motor. You have to run thru the test procedures and check everything to diagnose.
A quick wat to check the TTVA motor is just remove and tie it up leaving it connected. A small vice grips on the TV shaft and you should be able to feel any hanging, especially cold. If you tie the vice grips off with partial advance, clear the codes, you should be able to drive and see if the codes come back. Might help narrow down where to look.
The TTVA runs the throttle valve on the VB just like the TV cable used to do. The throttle valve in the VB has habit of wearing a rim in it that could cause it to stick and that would likely cause the TTVA to throw the stuck code. Pretty simple fix with the repair kit from Sonnax.
Last but not least, the ECU may have a bad driver for the TTVA motor. You have to run thru the test procedures and check everything to diagnose.
A quick wat to check the TTVA motor is just remove and tie it up leaving it connected. A small vice grips on the TV shaft and you should be able to feel any hanging, especially cold. If you tie the vice grips off with partial advance, clear the codes, you should be able to drive and see if the codes come back. Might help narrow down where to look.
They did reset it and it drove just fine and then when they started later the check light came back on and got the codes again and shifted awful again.
OK so I took it out and cleaned the electrical connecters because there was a couple pin that were corroded and stuck it back in and still didn't work so I guess on to the next. How do you reset the codes tried to unhook batteries for awhile and that didn't work.
You have to have a code reader capable of clearing the codes to get rid of them. If you fix the issue it should shift correctly again even though the codes are present. Without going thru the whole posted test procedure, since there was corrosion presnt in the TTVA connector it might need replacement.
Ok I am kinda confused I read a couple of the codes and what they meant and ap1754 means ttva stuck but a code p1751 transmission throttle valve position minimum range performance, what does that mean.
Generally means the TTVA motor is bad and not performing to spec.
Hey found this tsb could this be causing my issue were it just needs to be flashed or just replace ttva. 48RE Transmission – 1-2 shift hunt at light throttle.
The customer may experience a 1-2 shift transmission hunt during light throttle application. This
condition may be due to a governor pressure solenoid valve. This bulletin involves the replacement
of the governor pressure solenoid valve in the transmission valve body. and would they cover it even out of warranty. Thanks
The customer may experience a 1-2 shift transmission hunt during light throttle application. This
condition may be due to a governor pressure solenoid valve. This bulletin involves the replacement
of the governor pressure solenoid valve in the transmission valve body. and would they cover it even out of warranty. Thanks
That is not the same thing as the TTVA codes. Thats a different issue.
Got it fixed I put a new actuator in and now it shifts like new again. Thanks for all the help.
Hey got one more question, its been a couple months now since my truck shifted right I forgot what it should be shifting at, right now it is shifting at about 1500 rpm and shifting smooth. Thanks
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Issue 128 – Digital Version
Digital Magazines
FREE!
TDR Test Drive - Digital Edition
Renew
Subscribe
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Back Issues
Subscription Status
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The Perfect Collection Vol. II
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What Makes Us Tick?
Product Showcase
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