codes 1751 1753

[CHoernke]

I used my truck for 3 hours on muddy wet road in Utah . then hooked up my 26 ft trailer got on the interstate . accelrated good , started climbing a hill the truck downshifted on is own. then the check engine light came on. lost power (40%) pull off and checked under the hood, everything looked ok . drove home the the transmission fluid level was above the hole on the stick. about half a quart low, I used my code reader and got the code 1751 and 1753 . What is happening HELP!! 2006 4x4 3500 DRW auto

 

[JApol]

My 05 manual is calling out the TTVA on the transmission.

The first code is that a valid low voltage can not bet set and is only monitored while the vehicle is in park or nuetral and not moving.

The second is monitored in overdrive above 50% throttle. It says that the TTVA is electrically good but not mechanicly. Sounds like a good bet that either wires got yanked out or the TTVA itself is bad.

 

[CHoernke]

computor problem?

I took the truck to a transmission shop. they checked the TTVA and it worked on another truck they had in the yard. they checked the wires . one of the conectors had some mouisture in it. they said the TTVA had 5 volts going to it . They think its the computor. They called the Dodge house and they said the computor was $900 but was replaced with another for $1200 now the replacement ir $1800. Whats up with this? HELP . Dodge said to bring it in to them and it might be warrented . I dont have the extended warrenty . I have 53000 miles

 

[JApol]

this would fall under the power train warrenty 100,000 miles. When I get home I will get into the manual and see if there is another possibility.

 

[CHoernke]

thank you for checking this out

 

[JApol]

I don't know how to copy the page so here is the text
Code 1751:
P1751-TRANSMISSION THROTTLE VALVE POSITION MINIMUM RANGE PERFORMANCE (CONTINUED)
For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 48RE - SCHEMATICS
AND DIAGRAMS)
For a complete wiring diagramRefer to Section 8W
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.
² When Monitored:
Ignition on and with or without engine running with transmission in the park or neutral position. Note: Not monitored
when either the engine is cranking or while vehicle is moving.
² Set Condition:
Each time the ignition is cycled to the on position, the ECM commands a TTVA internal calibration procedure
(autozero) to determine the zero position. If the TTVA does not reach a calibrated minimum position in a predetermined
amount of time, the DTC will set.

Diagnostic Test
1. CHECK IF THE DTC IS CURRENT
Ignition on, engine not running.
With the scan tool, read Engine DTCs.
Record the Freeze Frame data for the reported DTC.
With the scan tool, erase DTCs.
Turn the ignition off to the lock position.
Using the Freeze Frame data recorded earlier, try to duplicate the conditions in which the DTC originally set.
NOTE: It may be necessary to road test the vehicle to duplicate the original set conditions.
With the scan tool, read Engine DTCs.
Did the DTC reset?
Yes >> Go To 2
No >> Go To 5


2. CHECK TTVA FOR SIGNS OF DAMAGE
Turn the ignition off to the lock position.
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.
Is the TTVA damaged or improperly mounted?
Yes >> Repair as necessary.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/
ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - DIAGNOSIS AND TESTING)
No >> Go To 3

3. 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. Do not press on the accelerator pedal during this test.
With the scan tool, monitor the TTVA position during the autozero test.
Ignition on, engine not running.
Is the TTVA position between 3 and 26 degrees after completion of the autozero test?
Yes >> Go To 5
No >> Go To 4

4. CHECK THE TRANSMISSION THROTTLE VALVE
Turn the ignition off to the lock position.
Remove the TTVA from the transmission per the Service Information.
Properly support the TTVA and reconnect the TTVA wiring harness.
Like in the previous step, with the scan tool, monitor the TTVA position during the autozero test.
Ignition on, engine not running.
Is the TTVA position between 3 and 26 degrees after completion of the autozero test?
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 8 - ELECTRICAL/
ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - DIAGNOSIS AND TESTING)
No >> Replace the TTVA per the Service Information.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/
ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - DIAGNOSIS AND TESTING)

5. INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, visually inspect the related wiring harness. Look for any chafed, pierced, pinched,
or partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Wiggle the wiring and connectors while checking for any possible open or shorted circuits.
Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.
Were there any problems found?
Yes >> Repair as necessary.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/
ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - DIAGNOSIS AND TESTING)
No >> Test Complete.

 

[JApol]

1753:

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.

² When Monitored:

Ignition on, engine running in a valid forward gear with a throttle opening greater than 50% and the transmission

in overdrive.

² Set Condition:

When the Governor pressure is below a minimum threshold when conditions indicate that the Governor pressure

should be high. This DTC indicates that the TTVA is working properly electronically but mechanically the

output shaft is not moving the Throttle Valve in the transmission.



Diagnostic Test

1. CHECK FOR GOVERNOR PRESSURE DTCS

Ignition on, engine not running.

With the scan tool, check Engine DTCs.

Are there any Governor Pressure related DTCs present?

Yes >> Refer to the Transmission category and perform the appropriate symptom(s). (Refer to 21 - TRANSMISSION/

TRANSAXLE/AUTOMATIC - 48RE - DIAGNOSIS AND TESTING)

No >> Go To 2



2. CHECK TTVA FOR SIGNS OF DAMAGE

Turn the ignition off to the lock position.

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.

Is the TTVA damaged or improperly mounted?

Yes >> Repair as necessary.

Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/

ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - DIAGNOSIS AND TESTING)

No >> Go To 3





3. CHECK IF TTVA SHAFT END IS DAMAGED

Turn the ignition off to the lock position.

Remove the TTVA from the transmission per the Service Information. (Refer to 21 - TRANSMISSION/TRANSAXLE/

AUTOMATIC - 48RE/THROTTLE VALVE ACTUATOR - REMOVAL)

Inspect the end of the TTVA shaft for cracks or damage.

NOTE: The end of the TTVA should be keyed or ”D” shaped and fit tightly over the Throttle Valve shaft.

Is the end of the TTVA shaft undamaged and fit tightly over the Throttle Valve shaft?

Yes >> Go To 4

No >> Inspect the Throttle Valve shaft on the transmission for free movement. If the Throttle valve does not

move freely, inspect internal transmission components related to the Throttle Valve and replace as necessary.

Replace the TTVA in either case. Refer to the Service Information. (Refer to 21 - TRANSMISSION/

TRANSAXLE/AUTOMATIC - 48RE/THROTTLE VALVE ACTUATOR - REMOVAL)

Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/

ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - DIAGNOSIS AND TESTING)



4. CHECK THE TRANSMISSION THROTTLE VALVE ACTUATOR

Properly support the TTVA to where the end of the shaft can be observed and reconnect the TTVA wiring harness.

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. Do not press on the accelerator pedal during this test.

Ignition on, engine not running.

Observe the output shaft of the TTVA during the autozero procedure.

After completion of the autozero procedure, while observing the TTVA shaft, press the accelerator pedal to full throttle.

Does the TTVA internal motor move the TTVA shaft?

Yes >> Inspect the Throttle Valve shaft on the transmission for free movement. If the Throttle valve does not

move freely, inspect internal transmission components related to the Throttle Valve and repair or replace

as necessary. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 48RE/THROTTLE VALVE

ACTUATOR - REMOVAL)

Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/

ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - DIAGNOSIS AND TESTING)

No >> Replace the TTVA per the Service Information.

Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/

ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - DIAGNOSIS AND TESTING)





5. INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this DTC are not present at this time.

Using the schematics as a guide, visually inspect the related wiring harness. Look for any chafed, pierced, pinched,

or partially broken wires.

Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

Wiggle the wiring and connectors while checking for any possible open or shorted circuits.

Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.

Were there any problems found?

Yes >> Repair as necessary.

Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/

ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - DIAGNOSIS AND TESTING)

No >> Test Complete.

 

[CROW]

JApol-I give you an A plus for responses. Good Job.

 

[CHoernke]

the third shop I took it to noticed a wire connector holder under the hood was broke. We zip tied the wire connectors to the bracket to keep the connectors from moving. This fix worked for 2 months . Update 2/12/08 IT happened again . for the third time. It happens when towing and going up a grade. when the trans down shifts it up shifts then back down then back , I manualy down shift then the light came on. its back in the shop hope they can figure it out.