Injuneer or Shoebox

[Dave M]

Can either of you guys help me on the follwoing thread? I don't know if you saw it since it was labeled NFB.

http://www.f-body.com/forum/showthread.php?t=7412

Thanks!

[todd200]

I don't know how much this will help without a scanner but....
CIRCUIT DESCRIPTION
The 1-2 Shift Solenoid (SS) valve controls the fluid flow acting on the 1-2 and 3-4 shift valves. The solenoid is a normally-open exhaust valve. With the 2-3 SS valve, the 1-2 SS valve allows four different shifting combinations.

When the VCM detects a 1-1-4-4 or a 2-2-3-3 shift pattern, depending on the state of the mechanical failure, then DTC P0751 sets. DTC P0751 is a type A DTC.

CONDITIONS FOR RUNNING THE DTC

* No TP sensor DTCs P0122 or P0123.
* No VSS assembly DTCs P0502 or P0503.
* No TCC solenoid valve DTC P0740.
* No TCC stuck ON DTC P0742.
* No 1-2 SS valve DTC P0753.
* No 2-3 SS valve DTC P0758.
* No 3-2 SS valve assembly DTC P0785.
* No TFP manual valve position switch DTC P1810.
* No TCC PWM solenoid valve DTC P1860.
* The engine speed is greater than 450 RPM for 5 seconds .
* The engine is not in fuel cutoff.
* The vehicle speed is greater than 8 km/h (5 mph ).
* The TP angle is 10-35% .
* The TP angle is constant within ±7% .
* The gear range is D4.
* The transmission fluid temperature is 20-130°C (68-266°F) .
* The VCM commands a 1-2, 2-3 and 3-4 shift.
* The TCC is commanded ON.

CONDITIONS FOR SETTING THE DTC
DTC P0751 sets if the following conditions occur three times:

* Within 2 seconds , the engine speed in 2nd gear is 80 RPM greater than the last speed in 1st gear.
* Within 2 seconds , the engine speed in 3rd gear is 100 RPM less than the last speed in 2nd gear.
* Within 2 seconds , the engine speed in 4th gear is 10 RPM greater than the last speed in 3rd gear.

All of the above conditions are met and one of the following conditions occurs:

Condition 1

* The speed ratio is 0.85 to 1.2 (speed ratio is engine speed divided by transmission output speed).
* The TCC slip speed is 200-1000 RPM for 4 seconds .

Condition 2

* The speed ratio is 0.6 to 0.8.
* The TCC slip speed is -20 to +50 RPM for 4 seconds .

ACTION TAKEN WHEN THE DTC SETS

* The VCM illuminates the Malfunction Indicator Lamp (MIL) .
* The VCM commands D2 line pressure.
* The VCM freezes shift adapts from being updated.
* The VCM records the operating conditions when the Conditions for Setting the DTC are met. The VCM stores this information as Freeze Frame and Failure Records.
* The VCM stores DTC P0751 in VCM history.

CONDITIONS FOR CLEARING THE MIL/DTC

* The VCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.
* A scan tool can clear the MIL/DTC.
* The VCM clears the DTC from VCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
* The VCM cancels the DTC default actions when the fault no longer exists and/or the ignition switch is OFF long enough in order to power down the VCM.

DIAGNOSTIC AIDS

* Verify that the transmission meets the specifications in the Shift Speed table.
* Other internal transmission failures may cause more than one shift to occur.
* Refer to the Shift Solenoid Valve State and Gear Ratio table.

[Injuneer]

One of the things I'm totally ignorant of is an automatic tranny and how it works. Can't help.