I have been helping out a friend of mine with this issue and it has got us no where.
He has a 1990 Honda Accord EX Auto with 158k. As much as I know the car stop shifting from 2nd gear and on.. CEL came on as well as the S light. Pulled out the codes as there was a few on the CEL side and fixed every code.
On the TCU side it kept reading Code 15 which is the VSS. At this point both solenoids where replaced with working ones and still problem persist so we went ahead and replaced the VSS with a new one and no luck either. Wire harness that goes from the TCU to the solenoids was check and even re-wired and still no luck.
We also searched and read plenty of the threads regarding this issue and came across the NM and NC sensors on the passenger side of the transmission of which both where replaced recently and no change in the transmission.
The TCU keeps reading Code 15 VSS. The transmission does go into P,R,N,D4 but only stays in 1st gear. Now we reset the ECU and TCU and the car does shift thru all D gears perfectly fine but as soon as the TCU pops Code 15 it stops shifting and it does it every time.
Last thing to replace would be the VSS Gear assembly which is the only thing that has not been touched. The TCU has also been replaced with a working one from the same 90-91 accord. It has been frustrating trying to figure out the problem.
He has a 1990 Honda Accord EX Auto with 158k. As much as I know the car stop shifting from 2nd gear and on.. CEL came on as well as the S light. Pulled out the codes as there was a few on the CEL side and fixed every code.
On the TCU side it kept reading Code 15 which is the VSS. At this point both solenoids where replaced with working ones and still problem persist so we went ahead and replaced the VSS with a new one and no luck either. Wire harness that goes from the TCU to the solenoids was check and even re-wired and still no luck.
We also searched and read plenty of the threads regarding this issue and came across the NM and NC sensors on the passenger side of the transmission of which both where replaced recently and no change in the transmission.
The TCU keeps reading Code 15 VSS. The transmission does go into P,R,N,D4 but only stays in 1st gear. Now we reset the ECU and TCU and the car does shift thru all D gears perfectly fine but as soon as the TCU pops Code 15 it stops shifting and it does it every time.
Last thing to replace would be the VSS Gear assembly which is the only thing that has not been touched. The TCU has also been replaced with a working one from the same 90-91 accord. It has been frustrating trying to figure out the problem.
into troubleshooting things I did not know of as working on an automatic is my first.
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