How to build a cool shift diagnostic device
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Joined: Aug 2006
Posts: 10,854
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From: BLOOMSBURG PA
How to build a cool shift diagnostic device Parts- all from radio shack cheap
1-Three 12v LEDs They can be different colors(NO LIGHT BULBS WILL NOT WORK)
2-Some sort of bevel to mount them in Or you can mount them in a panel in your car permanent.
3-Three lengths of wire. Preferably different colors to avoid confusion.
4-Blue side wire splicers the type you use pliers to push down the tab to make a splice.
Ok you want to hook the three wires to the following in the harness either at the trans or find them at the PCM
A-Light green wire. This is the 1-2 shift solenoid.
B-Yellow with black stripe. This is the 2-3 shift solenoid
C-Tan wire with black stripe. This is the lockup (TCC)
solenoid.
Do not cut the wires use the slicers and connect your wires one to each and then run them into the car.
Inside the car take each wire and hook up to the negative side of the LEDs choose which ones you want to represent each solenoid.
Tie the POSITIVE side of all the LEDs together and run a wire to a 12v switched source(radio fuse)
Ok now its simple
(1-2)on and (2-3) on is 1st gear
(1-2)off and (2-3) on is second gear
(both off ) is 3rd gear
(1-2)on and (2-3) off is 4th gear
TCC on means your converter should be locked.
Or with the 4l80e same set up but shift pattern changes to
1st 1-2 solenoid A on 2-3 solenoid B OFF
2nd both solenoids off
3rd solenoid 1-2 A off and solenoid 2-3 B on
4th both solenoids on,
This IMO is cool and helpful no more will you wonder if that 2-3 shift that hit the limiter was tuning or trans related and you will know the time from command to actual shift watching when the lights illuminate and feeling when the shift happens. This could be useful when setting shift points since the time is a constant.
No more wondering wither your converter not being locked is a tuning or transmission issue you will see when and if the PCM commands lockup and this can all be done for less than $10 and 30 minutes setting it up.
Hope someone finds this useful was thinking I have explained this a dozen times to people trying to solve various lockup and shifting issue and may or may not have scanner tools and its proved invaluable to them so why not just post it for anyone who might wanna make a new toy/gadget.
1-Three 12v LEDs They can be different colors(NO LIGHT BULBS WILL NOT WORK)
2-Some sort of bevel to mount them in Or you can mount them in a panel in your car permanent.
3-Three lengths of wire. Preferably different colors to avoid confusion.
4-Blue side wire splicers the type you use pliers to push down the tab to make a splice.
Ok you want to hook the three wires to the following in the harness either at the trans or find them at the PCM
A-Light green wire. This is the 1-2 shift solenoid.
B-Yellow with black stripe. This is the 2-3 shift solenoid
C-Tan wire with black stripe. This is the lockup (TCC)
solenoid.
Do not cut the wires use the slicers and connect your wires one to each and then run them into the car.
Inside the car take each wire and hook up to the negative side of the LEDs choose which ones you want to represent each solenoid.
Tie the POSITIVE side of all the LEDs together and run a wire to a 12v switched source(radio fuse)
Ok now its simple
(1-2)on and (2-3) on is 1st gear
(1-2)off and (2-3) on is second gear
(both off ) is 3rd gear
(1-2)on and (2-3) off is 4th gear
TCC on means your converter should be locked.
Or with the 4l80e same set up but shift pattern changes to
1st 1-2 solenoid A on 2-3 solenoid B OFF
2nd both solenoids off
3rd solenoid 1-2 A off and solenoid 2-3 B on
4th both solenoids on,
This IMO is cool and helpful no more will you wonder if that 2-3 shift that hit the limiter was tuning or trans related and you will know the time from command to actual shift watching when the lights illuminate and feeling when the shift happens. This could be useful when setting shift points since the time is a constant.
No more wondering wither your converter not being locked is a tuning or transmission issue you will see when and if the PCM commands lockup and this can all be done for less than $10 and 30 minutes setting it up.
Hope someone finds this useful was thinking I have explained this a dozen times to people trying to solve various lockup and shifting issue and may or may not have scanner tools and its proved invaluable to them so why not just post it for anyone who might wanna make a new toy/gadget.
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