A bit of back ground.
1989 AW4 4.0
I have had problems with the coolant temps rising to 235+ at speed and tracked it down to the torque converter not locking. The tranny shifts though all gears just fine while driving. Manual shifting works too.
I have been on a couple of trips after the swap where the coolant temp did not rise.
Last year I swap an AW4 in for the old BA/10.
It was a straight swap out of my 1990 donor. Swapped the Engine bay wire harness, TCU and TPS.
Put light on C14 to ground. No light.
Put switch with power to C14. TC lockes when power applied. (TC works)
I have read many threads on the TC lockup and tested the TSP and TCU.
The TPS Look OK.
Pins A - D 4.6 volts
Pins B - D 3.9 -> 0.4 volts smooth transition
TCU
This look questionable to me but....
Key on Motor off
Pin Volts
C3 5.8
C8 0.8 Shifter in 1-2
C9 0.0 Shifter in D
C10 11.04 Brake off
10.96 Brake on
D1 5.5
D2 4.7 throttle closed
1.1 WOT
D3 0.8
D16 12.6
Key off
D14 11.4
Resistance - unplugged
C14 13.9
C15 13.9
C16 13.7
Resistance across brake switch
brake on inf.
brake off 0
C10 to brake switch 1219 ohms (set at 2000)
Resister by TCU between C10 Lt. Blue/Yellow to yellow ECU
1205 ohms
I have hit the limit of my electronics abilities with this one.
To me it seem that the voltage on C10 is causing the TCU to think the brake is on and not lock the converter. Any ideas why it has the voltage with brake off?
The volts on C9, C10 are off the values given at (http://www.transonline.com/transdigest/magazines/1997-10/Shift Pointers/index.html). Unless you think those are related I'll skip that for now.
1989 AW4 4.0
I have had problems with the coolant temps rising to 235+ at speed and tracked it down to the torque converter not locking. The tranny shifts though all gears just fine while driving. Manual shifting works too.
I have been on a couple of trips after the swap where the coolant temp did not rise.
Last year I swap an AW4 in for the old BA/10.
It was a straight swap out of my 1990 donor. Swapped the Engine bay wire harness, TCU and TPS.
Put light on C14 to ground. No light.
Put switch with power to C14. TC lockes when power applied. (TC works)
I have read many threads on the TC lockup and tested the TSP and TCU.
The TPS Look OK.
Pins A - D 4.6 volts
Pins B - D 3.9 -> 0.4 volts smooth transition
TCU
This look questionable to me but....
Key on Motor off
Pin Volts
C3 5.8
C8 0.8 Shifter in 1-2
C9 0.0 Shifter in D
C10 11.04 Brake off
10.96 Brake on
D1 5.5
D2 4.7 throttle closed
1.1 WOT
D3 0.8
D16 12.6
Key off
D14 11.4
Resistance - unplugged
C14 13.9
C15 13.9
C16 13.7
Resistance across brake switch
brake on inf.
brake off 0
C10 to brake switch 1219 ohms (set at 2000)
Resister by TCU between C10 Lt. Blue/Yellow to yellow ECU
1205 ohms
I have hit the limit of my electronics abilities with this one.
To me it seem that the voltage on C10 is causing the TCU to think the brake is on and not lock the converter. Any ideas why it has the voltage with brake off?
The volts on C9, C10 are off the values given at (http://www.transonline.com/transdigest/magazines/1997-10/Shift Pointers/index.html). Unless you think those are related I'll skip that for now.