Transmission shifting problems?

Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.

Good afternoon,

The first thing I would do is drop the pan and change the filter. A partially clogged filter will give this issue.

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Also, the throttle position sensor is what controls shift time. If the sensor is out of adjustment or reading erratically, it will also do this.

https://www.2carpros.com/articles/automatic-transmission-problems

Do you have a scan tool that can read live data?

Roy

TPS

PURPOSE
The Throttle Position (TP) sensor is a rotary potentiometer that determines throttle plate angle. The Power-train Control Module (PCM) determines operating modes from the TP signal. These are:
- Closed throttle, idle or deceleration
- Part throttle, cruise or moderate acceleration
- Wide open throttle, maximum acceleration, dechoke on crank and A/C cutout
- Throttle angle rate, acceleration pump type function
- Transmission shift schedule

CONSTRUCTION
The TP sensor is mounted on the throttle body and is directly linked to the throttle shaft. The TP sensor is composed of a wiper arm that moves along a curved resistor.

OPERATION
The TP sensor measures travel of the throttle shaft to produce a continuously variable output signal proportional to the throttle plate position.

Throttle Position Sensor Schematic
imageOpen In New TabZoom/Print

The potentiometer functions as a voltage divider. A 5.0 volt reference signal is applied to one end (VREF) of a curved resistance material, with the other end grounded along the SIG RTN circuit.

The TP sensor output signal is taken off a wiper arm (mechanically linked to the throttle shaft) that travels along the entire length of the curved resistor

At closed throttle the TP wiper arm is nearer the ground side of the resistor resulting in a lower output, 0.6 volts at 0% throttle angle.

At wide open throttle the TP wiper arm is nearer the reference voltage side of the resistor resulting in a higher output, 4.5 volts at 85% throttle angle.

RELATED DIAGNOSTIC TROUBLE CODES

DTC 121 - TP sensor output is out of the self-test range.

DTC 122 - TP sensor output is below the minimum self-test value.

DTC 123 - TP sensor output is above the maximum self-test value.

DTC 124 - TP sensor output is higher than expected.

DTC 125 - TP sensor output is lower than expected.

Note: DTC 124, 125 were intended to detect in-range failures of the TP sensor. The PCM compares information from the Mass Air Flow (MAF) sensor, TP sensor, and fuel injection pulse width. If any one value appears to be out of line with the other two an in-range trouble code will be set.

You will need a scan tool that can read the voltage while running. You could go to a parts store and have them read it for you. They have the scan tool that can read live data and do it for you right there. That is a free service.

Uyou should look at.5 volts at idle and 4.8 at full throttle. It should be a smooth sweep up when the pedal is pushed. Please do this check with the key on, engine off.

Roy

No, the OD light blinking indicates the overdrive clutches or band may be the issue especially if the clutches are slipping. Very common issue with these transmissions.

I attached a diagram for you to view. 13 through 16 is the area behind the front pump that is the overdrive clutches.

Roy

Yes, that is correct.

You will need a lift and a transmission jack for the removal along with a lot of small tools.

Then you will need a front pump puller as well. It may be a good idea to remove the transmission and take it to someone who can replace the needed parts for you.

Roy

Procedure

REMOVAL
1. Disconnect battery ground cable, then raise and support vehicle.
2. Starting at rear of oil pan and working toward the front, loosen bolts and allow fluid to drain. Remove remaining oil pan bolts except for two at front of oil pan. After fluid has been drained, install two bolts onto rear side of pan.
3. Remove converter drain plug access cover from lower end of converter housing.
4. Remove converter-to-flywheel retaining nuts.
5. Turn converter until drain plug is accessible. Remove plug and drain fluid.
6. Install converter drain plug.
7. On Cougar and Thunderbird, proceed as follows:
a. Remove catalytic converter assembly, then body reinforcement.
B. Remove exhaust pipe and muffler assembly.
8. On all models, mark rear driveshaft yoke and companion flange so driveshaft can be installed to its original position. Remove driveshaft assembly.
9. Position a suitable plug into extension housing to prevent fluid leakage.
10. Remove starter motor and disconnect neutral start switch electrical connector.
11. Remove rear mount-to-cross-member and two cross-member-to-frame bolts.
12. Remove engine rear support-to-extension housing bolts, then disconnect Throttle Valve (TV0 linkage rod from transmission TV lever and manual rod from manual lever at transmission.
13. Remove bolts securing bell-crank bracket to converter housing.
14. Using a suitable jack, raise transmission and remove cross-member from side supports. Disconnect and remove any interfering exhaust system components.
15. Lower transmission and disconnect oil cooler lines from transmission.
16. Disconnect speedometer cable from extension housing.
17. Lower transmission to gain access to oil cooler lines, then disconnect each oil line.
18. Remove bolt and transmission filler tube from transmission.
19. Secure transmission to jack using a suitable chain.
20. Remove converter housing-to-cylinder block bolts.
21. Carefully move transmission and converter assembly away from engine and at the same time, lower jack to permit the transmission to clear the underside of vehicle.

Yes, you can. When you drive it, just put it in drive and use the overdrive button to turn it off. That will allow it just go through the other gears without overdrive.

Look for a book on line from ATSG. They have manuals for all transmissions. Good guide to follow doing this repair after you get it out.

Roy

Good evening,

I attached a wire diagram for you to view. It shows the color of the wires for you wiring it.

Roy

Do you realize that is the connector for the four wheel drive connector on the transfer case?

You need to be looking at the neutral safety switch on the side of the transmission.

No, solder and shrink wrap the connections.

Roy

The two wires you need are these.

Roy

That sounds good. Do that test and see.

Roy