HELP anyone

[jdawgs94z]

my car is running at 3k rpm's on the highway at 70mph,had the car tuned and kept getting 2 codes that i can't figure out how to fix,posted this info on several websites even hptuners site and can't get an answer,here they are #1 error 73 force motor current #2 error 84,3-2 downshift feedback fault.and the pcm is not telling the laptop what gear the tranny's in,if anyone knows how to fix this please help,i need my car to look for work and it's eating gas like crazy 8mpg

[Alex94TAGT]

Few questions:

1) This is a 1994, OBD1 correct?
2) You're the one that dropped the tranny during an install? (and were thus concerned about the wiring?)

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Ok, yes, those codes mean you've got some serious problems. If you dropped the tranny, then it's possible you pulled/damaged the wiring, but it's also possible that you damaged the mechanical components. I would start by checking for electrical problems, then work your way from there to any possible mechanical problems.


1) The big thing here is the DTC 76. If I understand this correctly, the computer is sensing a fault in the wiring (too high or too low voltage) from the pressure control solenoid (transmission). When this happens, the computer cuts all voltage to the PCS, thus causing constant full line pressure within the tranny. This would obviously be affecting the tranny shift points.

The wires you need to check here are:

-Pin C16 on the Gray/Clear PCM connector. This is a red wire with black stripe. This is the PCS high voltage wire (6.4v) .
-Pin D2 on the Blue PCM connector. This is a light blue wire with white stripe. This is the PSC low voltage wire (1.3v).


2) As for the DTC 84, this is the wire going to Pin B13 on the BLACK PCM connector. It should be a white or gray wire. This is going to the 3-2 shift control solenoid.

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I'm trying to find a diagram showing where these wires run to the transmission, but I'm having trouble locating one. I'll get back to you on that, then perhaps you can do some continuity/resistance testing on the wiring...

In the meantime, you can try to crawl under the car and look for the correct wires going to the transmission. All you need to do is find a red/black wire, a light blue/white wire, and a solid white or gray wire -- connecting to the transmission.

[jdawgs94z]

thanks alex,will do,get back to me if you find any more info,the tranny itself was fine,just that on the tranny bolt at 1oclock on the bellhousing has a point that the dipstick and the wiring are routed thru,when he dropped it the wiring and dipstick tube were still connected by a bolt to the tranny that was not connected to the car anymore but was still threaded on the bellhousing,i think stretching the wires or just plain ruining them,hope this don't cost to much to replace if i have to replace it,we'll let you know what happened