Reasons the TCC won't engage

[savage1987]

Torque converter won't lock up. I'm a bit over poking and prodding things on the car, just done a motor swap. Anyone able to point me in the right direction to find the plug I have surely left out?

Sam

[levymetal]

what's the temperature like when it's running? coolant temp sensor might not be working correctly. the torque converter only locks up when the coolant temp sensor is reading above some certain temp, and if it's reading too cold, it won't lock up.

[savage1987]

Gets up to temp fine.

[delcowizzid]

yip coolant sensor needs to read right .tps sensor volts need to be at a certian amount ,speed needs to be above 80+km/h.kickdown adjusted.fuses all good.temp switch on trans plugged in

[camstatic]

Mine wasn't engaging for a while, after poking around for a decent amount of hours on it, it turned out the clutch itself was stuffed and it was just slipping when it was engaged anyway.

[wildss]

didnt greenfoam start a thread a lil while ago about the sam eproblem?
turned out his ecu was the culprit

[camstatic]

Really need to log it and see if it's trying to engage.

[savage1987]

yip coolant sensor needs to read right .tps sensor volts need to be at a certian amount ,speed needs to be above 80+km/h.kickdown adjusted.fuses all good.temp switch on trans plugged in

will check that trans temp switch... where do I look, on the trans itself?

Mine wasn't engaging for a while, after poking around for a decent amount of hours on it, it turned out the clutch itself was stuffed and it was just slipping when it was engaged anyway.

Unlikely, the TC is only young, new one with rebuilt auto about a yr ago, worked fine with old motor

didnt greenfoam start a thread a lil while ago about the sam eproblem? turned out his ecu was the culprit

My ECU is the same one that was running fine on the old motor.. locked up every time at 90kph

Really need to log it and see if it's trying to engage.

Checking the fault codes do the trick?

[greenfoam]

Coolant sensor / tps / ecu
take your pick

[Chirpstr]

Check your battery/reg because if the computer is not getting enough power then this can also cause this.

[savage1987]

Replaced TPS and coolant temp sender (ECU one), still no lockup

Next thing I will check is that I have actually plugged in the TCC