code 632 and 639

[69fastback393]

i have a 95 5.0 / aode trans 355 gears .if you start off easy it shifts ok but anything above that it wont shift till pretty high rpms and wont go into overdrive till about 70.i am getting 536,632 & 639 codes.i replaced the tss sensor and it still has these codes.has anyone had this problem.

 

[mo_dingo]

536 = you didn't push the brake pedal when you were doing the koer tests.

632\639 are for the tss circuit. You replaced the shift solenoid, not the speed sensor, right???

It looks like you have a wiring problem. Either the PCM isn't receiving the info, or the PCM is bad. Likely the pcm isn't getting the info from the sensor and it's wiring.

From the wiring diagram i have, I see a red wire, which appears to be a VREF. I would assume it's either 12V or 5V, idk to be honest. Check for that at the red wire.

Next, there is purple/orange wire, and a orange/yellow wire on the tss. Those go straight to the pcm. You can do a continuity test and see if any have lost the connection to the pcm.

I don't have a pinout for the pcm, so I don't know which wires they are. But I would hope that there aren't too many of the same color going to the pcm.
Scott

 

[69fastback393]

thanks scott, i replaced the tss not the vss(speedo).this is a new harness. also.is there a way to check the tss voltage from the pcm?what voltage should it be? i was also told it could be the mlps..thanks

 

[mo_dingo]

thanks scott, i replaced the tss not the vss(speedo).this is a new harness. also.is there a way to check the tss voltage from the pcm?what voltage should it be? i was also told it could be the mlps..thanks

I saw your other thread, did you replace the mlps? did it fix the problem???

There should be a red wire going to all the sensors/solenoids in the trans. They are solid red. I don't know the VREF, but it's either 5V or 12V. Beats me, to be honest.
Scott

 

[69fastback393]

mlps is next.i will let you know.....thanks

 

[69fastback393]

mlps fixed the problem!!!! thanks again