When brakes are applied what sensor clicks there and also under the gear shift that turns my d4 on and off?

overdrive is the fourth gear.D1,D2,D3,D4 now drive truck at 80 kmh
cruise at steady speed no fuel pedal movement, downshift from D4 to D3 you should feel RPM raise .. after push brake pedal a little you should see RPM raise 300 to 400 rpm.
shift pattern is 1st gear ,second gear,3rd gear and lock up(torque converter clutch). 4th gear with lock up
hope it helps

Shift interlock system problem . Not the cable . Your vehicle has a safety system that won't allow the gear selector to be moved from park without the brake pedal pushed . Lock solenoid keeps gear selector from moving . Trying to force it will break something . Do you know how to test electrical circuits with a volt meter ? Here is a web site for free wiring diagrams http://www.bbbind.com/free_tsb.html
Enter the vehicle info. Year , make , model and engine size. Under system click on transmission / transaxle , then under subsystem click on shift interlock . Click the search button then the blue link. Park neutral switch , brake switch and the shift interlock solenoid , check electrical circuits .

It sounds like you have a Bad Shift Solenoid that is shorting out, Cleaning the Solenoid probably moved the "WIRE" and then when reinstalled, worked it way back. If the Shorting of the Shift Solenoid causes the issue with the PCM/TCM, then either your PCM did not have an issue or the Solenoid just took out your new PCM due to not repairing the issue the first time. I personally would start out with changing the Solenoids (ALL OF THEM) and Un-Plugging the PCM while doing the repair. This will do a reset for you.

Shift Interlock System
The shift interlock system prevents shifting from PARK unless the brake pedal is depressed. The shift interlock system consists of a shift lock actuator mounted at the base of the steering column or on the floor shifter mechanism. If the ignition switch is in the RUN position, the shift lock actuator is ON unless the brake pedal is depressed.

Symptom Chart
Symptom Chart Condition Possible Sources Action

• The shift interlock system does not release/lock correctly

• Circuitry.
• Fuse(s):
  • F1.5 (7.5A).
  • F1.27 (5A).
• Shift lock actuator.
• Brake pedal position switch.

• Go To Pinpoint Test D .

PINPOINT TEST D: THE SHIFT INTERLOCK SYSTEM DOES NOT RELEASE/LOCK CORRECTLY Test Step Result / Action to Take D1 TEST THE BRAKE LIGHTS

• Apply brake pedal and view brake lights.
• Do the brake lights illuminate?

Yes
GO to D7 .

No
GO to D2 . D2 TEST FUSE F1.5 (7.5A)

• Check fuse: Fuse F1.5 (7.5A).
• Measure the resistance of fuse F1.5 (7.5A).
• Is the resistance less than 5 ohms?

Yes
GO to D4 .

No
GO to D3 . D3 TEST CIRCUIT 729 (RD/WH) FOR A SHORT TO GROUND

• Disconnect: Brake Pedal Position Switch C278.
• Measure the resistance of circuit 729 (RD/WH) at brake pedal position switch C278-5.
• Is the resistance greater than 10,000 ohms?

Yes
GO to D4 .

No
SERVICE circuit 729 (RD/WH) for short to ground. TEST the system for normal operation. D4 TEST CIRCUIT 729 (RD/WH) FOR AN OPEN

• Measure the resistance between the output side of fuse F1.5 (7.5A) and brake pedal position switch C278-5, circuit 729 (RD/WH).
• Is resistance less than 5 ohms?

Yes
GO to D5 .

No
SERVICE circuit 729 (RD/WH) for open. RETEST the system. D5 TEST THE BRAKE PEDAL POSITION SWITCH

• Measure the resistance of brake pedal position switch (C278) while open (OFF) and closed (ON).
• Is the resistance of the switch greater than 10,000 ohms while OFF and less than 5 ohms while ON?

Yes
GO to D6 .

No
INSTALL a new brake pedal position switch. TEST the system for normal operation. D6 CHECK CIRCUIT 810 (RD/LG) FOR A SHORT TO GROUND

• Disconnect: Shift Lock Actuator C2008.
• Measure the resistance of circuit 810 (RD/LG), shift lock actuator C2096-1.
• Is the resistance greater than 10,000 ohms?

Yes
GO to D7 .

No
SERVICE circuit 810 (RD/LG) for short to ground. TEST the system for normal operation. D7 CHECK CIRCUIT 810 (RD/LG) FOR AN OPEN

• Measure the resistance of circuit 810 (RD/LG) between shift lock actuator C2096-1 and brake pedal position switch C278-6.
• Is the resistance less than 5 ohms?

Yes
GO to D8 .

No
SERVICE circuit 810 (RD/LG) for open. TEST the system for normal operation. D8 TEST FOR VOLTAGE ON CIRCUIT 1003 (GY/YE)

• Measure the voltage at shift lock actuator C2096-2, circuit 1003 (GY/YE).
• Is voltage greater than 10 volts?

Yes
GO to D12 .

No
GO to D9 . D9 TEST FUSE F1.27 (5A)

• Check fuse: Fuse F1.27 (5A).
• Is the resistance less than 5 ohms?

Yes
GO to D11 .

No
GO to D10 . D10 TEST CIRCUIT 1003 (GY/YE) FOR A SHORT TO GROUND

• Measure the resistance at shift lock actuator C2096-2, circuit 1003 (GY/YE).
• Is the resistance greater than 10,000 ohms?

Yes
GO to D11 .

No
SERVICE circuit 1003 (GY/YE) for short to ground. TEST the system for normal operation. D11 TEST CIRCUIT 1003 (GY/YE) FOR AN OPEN

• Measure the resistance of circuit 1003 (GY/YE) between output side of fuse F1.27 (5A) and shift lock actuator C2096-2.
• Is the resistance less than 5 ohms?

Yes
GO to D12 .

No
SERVICE circuit 1003 (GY/YE) for open. TEST the system for normal operation. D12 TEST CIRCUIT 57 (BK) FOR AN OPEN

• Measure the resistance of shift lock actuator C2096-6, circuit 57 (BK).
• Is the resistance less than 5 ohms?

Yes
INSTALL a new shift lock actuator. TEST the system for normal operation.

No
SERVICE circuit 57 (BK) for open. TEST the system for normal operation.

D5. This will use all 5 gears. D4 will not shift into 5th (overdrive). This causes higher revs on the highway, more noise and less fuel mileage. D4 is only really used when going down long hills for better engine braking. Leave it in d5 and let the cars computer do the shifting for you.

if this car is an automatic, you are probably hearing the shift interlock switch that prevents you from putting the car in gear without applying the brakes.

-very important check for brake light when pressed (outside rear)
-did u recently change any bulb at the rear if yes recheck if it the right brake light bulb 1157
u need to do a dignostic for the d4 light and it will lead u to the problem

You can remove the interlock off the gear shift or maybe spray some crc on it otherwise probably a loose wire or switch

change the transmission sensor...they are outside of tha transmission

why does the light in d4 flash when drivinh???