What symptoms will a faulty Throttle Sensor on a TB42 with an auto transmission show

[ckh]

What symptoms will a faulty Throttle Sensor on a TB42 with an auto transmission show, its an 89 GQ carby model..

[NissanGQ4.2]

I understand the Gearbox won't lock up

Did you find the location of yours???

Edit:

Throttle Sensor & Throttle Valve Switch (Only
for control of automatic transmission)
The throttle sensor is attached on the carburetor and actuates
in response to the accelerator pedal movement. This sensor is a
kind of potentiometer which transforms the throttle valve position
into output voltage, and emits the voltage signal to the A/T
control unit. In addition the sensor detects the opening and
closing speed of the throttle valve, and sends the voltage
change rate to the A/T control unit. The throttle valve switch
actuates in response to accelerator pedal movement.
This switch has idle contact and full throttle contact. The idle
contact is used for automatic transmission control. It closes
when the throttle valve is positioned at idle and opens when it
is at any other position.

[ckh]

I understand the Gearbox won't lock up

Did you find the location of yours???

Edit:

Throttle Sensor & Throttle Valve Switch (Only
for control of automatic transmission)
The throttle sensor is attached on the carburetor and actuates
in response to the accelerator pedal movement. This sensor is a
kind of potentiometer which transforms the throttle valve position
into output voltage, and emits the voltage signal to the A/T
control unit. In addition the sensor detects the opening and
closing speed of the throttle valve, and sends the voltage
change rate to the A/T control unit. The throttle valve switch
actuates in response to accelerator pedal movement.
This switch has idle contact and full throttle contact. The idle
contact is used for automatic transmission control. It closes
when the throttle valve is positioned at idle and opens when it
is at any other position.

OK had torque converter replaced, a O ring is what was stopping lockup, as presure was blowing by it.

[ckh]

Yesterday when I took it back to the transmission center, he asked me to wire up a test light to the solinoid wire, can confirm that when the tacho jumps, the light on the solinoid wire flickers..


The button on side of shifter is just that, can't see it being a problem

Not sure on diagnostic light staying on but could also be caused by an electrical issues.

Have you checked all earthing to make sure you have good earth's[/QUOTE]

manual it say if the power light stay on and doesnt go though the test its either Inhibitor switch, power shift switch, kick down switch idle switch or the A/T controler is damaged.
1. Inhibitor switch must be working as I can only start the car when in park or neutral.
2. power shift switch is working as when triving if I hit the power switch, it drops down to 3rd, when I turn switch of it will go into 4th and then converter lockup if doing over 85
3 kick down switch is working as if I press accelerator hard it unlocks converter and kicks down a gear, or if driving slowly will drop down a gear, if going really slow and hit the pedal, it kicks down and the power light comes on.
4 idle switch dont know how to check this one
5. A/T controler is damaged. cant test this either as dont have a spare A/T controler at the moment but may be aquiring on in a few weeks.

The tranny guy adjusted my TPS but I noticed today when trying to do self diagnostic's the second I tyrn the key to "on" I could hear a buzzing type sound, climbed under the car and could hear it was coming from inside transmission, disconnecting wiring loom near battery "brown plug" stopped the buzzing..
Adjust TPS back to its origional position and when turn key to on, no buzzing, any one have any idea what would be buzzing in side the tranny. I'm going to call the tranny guy on monday to see what he says.

Also regarding converter unlocking for a split second, only does it between 85-95ish, if I sit on 100 or more, it doesnt flicker the test light, or the tacho, might cut the solinoid wire again tomorrow and run 12V to it via a switch, and see if that stops the intermitent unlock by bypassing the computer all together.
But when I try to do diagnostics, still get same result power like just stays solid, pre him putting the new converter in could do self diagnostics time after time... so something has happended when he has had the tranny out..... I'm open to suggestions to try, and or to give me more questions to throw at him on monday..

[NissanGQ4.2]

This thread is now closed, any replies to this thread can be now be posted in the below thread

http://www.nissanpatrol.com.au/forums/showthread.php?18169-Cant-get-auto-transmission-in-89-GQ-auto-to-go-into-diagnostic-mode.

Cheers

Todd