98 v6 4x4 starts only when i engage clutch start cancel button

Check to make sure the safety switches are engaging. One on the clutch, one in the shifter and/or transmission.

Could be the clutch master or slave cylinder, or the clutch disc. The disc is not disengaging from the flywheel.

The gear box should be okay. Check the clutch-watch if the clutch fork on the bell housing moves when someone presses the clutch. If it doesn't move, the cable needs adjusting, or if hydraulic clutch diagnose the clutch master and slave cylinders. Either one should cause the clutch fork to move and engage the clutch.

The hydraulic clutch system is leaking and has air in it. You need to replace the master and slave cylinder.

Check your a/c fuse first you want to make sure you have power going to the a/c system If your a/c button light is on when you engage it you most likely have power. Second if your a/c system coolant is low of the recomended freon then so the compressor will NOT engage.This is a start!

You have a wire shorting out when you press the clutch. You will need to have help looking for it. Have someone set inside and press the clutch and look for a wire that is coming into contact with the linkage. Good Luck.

check the solenoid on the front chunk these vehicles have had a lot of problems with these solenoids. have personally replaced about 10 of these on 98-02 models.

check under dash where pedals are as there may be wiring there that the pedals are touching and shorting out

if you can move it into gear when its not running, id say clutch,
but if it wont go in at all, then Im thinking shift forks or linkage

96 toyota tacoma not start with the start cancel switch push in.