420A Auto to manual, speed sensor not working

[Brad Bell]

Using the instructions http://www.2gnt.com/?d=ATMT I did an auto to manual conversion on my 1999 eclipse gs 420a. Everything works fine except the speed sensor I wired up. I wired the three wires coming from the speed sensor to the wires corresponding on the ecu plug. I don't know for sure the wires are the correct ones, so if anyone knows for sure which wires that would be great. The power is going to the sensor, reading around 8.9 volts, but there isn't anything coming out, if so only slightly. The gauge cluster doesn't budge. Someone please help!!!!!!!!

 

[Brad Bell]

Have you tried rotating the right wheel while testing the wire to see if that voltage changes at all?

I am running the speed sensor by hand or by drill. It is out of the transmission. Very little fluctuation of voltage when I spin it by hand. Still no reading on speedometer though.

 

[Brad Bell]

Have you tried rotating the right wheel while testing the wire to see if that voltage changes at all?

I feel like it's the tcm in my car, there is little to no voltages on any of the plugs going to the old automatic transmission. Like nothing. Could there be a bad relay or somethi I can check.

 

[dustyboner]

You do have the auto trans computer unplugged or if its still plugged in, the (yellow/white) wire is disconnected from it, correct?

Pull out the gauge cluster and youll see 3 plugs. On the plug on the right, you need to check voltage between the bottom/left pin and ground. With the ignition switch on, you should get battery voltage

here is a copy of the electrical manual if itll help
http://www.mediafire.com/download/6v705mm1dzx/97-99Electrical.pdf

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[Brad Bell]

You do have the auto trans computer unplugged or if its still plugged in, the (yellow/white) wire is disconnected from it, correct?

Wait, so right now for me the automatic trans computer is plugged in with the yellow white wire still connected. You want it disconnected?

 

[dustyboner]

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If its still connected, you will have 2 paths for the current to travel, take a look at the diagram, on the AT it shows the (yellow/white) wire goes to an internal ground inside the ATX ecu
where as on the MT it is internally grounded at PCM PIN44 (black/green) .

The (yellow/white) wire shouldn't be connected to the ATX ecu

 

[Brad Bell]

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If its still connected, you will have 2 paths for the current to travel, take a look at the diagram, on the AT it shows the (yellow/white) wire goes to an internal
ground inside the ATX ecu
where as on the MT it is internally grounded at PCM PIN44 (black/green) .
The (yellow/white) wire shouldn't be connected to the ATX ecu

So if I cut the yellow white wire from the atx ECU it should possibly do the trick?

 

[dustyboner]

Can you just unplug the trqnsmission computer, then turn on the ignition, then check the voltage between Vss plug PIN3 (yellow/white) and ground (-).

 

[Brad Bell]

Can you just unplug the trqnsmission computer, then turn on the ignition, then check the voltage between Vss plug PIN3 (yellow/white) and ground (-).

Holy shit that did it!!!!!!!! Wow I can't believe it was that simple just to unplug the computer!!! Thankyou so much for helping me out with this you saved my ass. Thankyou

 

[dustyboner]

Cool. Glad you got it working.

if you havent switched to a MT PCM, doing so will get rid of the CEL and raise your rev limit 500rpms

 

[Trwko]

Cool. Glad you got it working.

if you havent switched to a MT PCM, doing so will get rid of the CEL and raise your rev limit 500rpms

Can you show mi a pic how you diret please

 

[Marcos_dsm98]

Holy shit that did it!!!!!!!! Wow I can't believe it was that simple just to unplug the computer!!! Thankyou so much for helping me out with this you saved my ass. Thankyou

Ok sorry for beinging this back but I have read through this thread 1000 times and It's just not getting to me can you tell me exactly where to connect the 3 cables for the speed sensor please i was just pulled over for speeding and I need it hooked up please help