altaguy Posted July 14, 2006 Share Posted July 14, 2006 I have an 89 Prelude with automatic trans. Recently the S3 light started to flash and the auto trans started to miss 2nd gear on up and downshifts. Now, when I start out in the morning, things go normally for a while and then after the car is warmed up, it starts forgetting it has 2nd gear again and the S3 light starts to flash. I have done some research [manual and Net] and this indicates transmission issues. Some info. I found seems to indicate resetting the TCU by disonnecting the battery sometimes works. Others say change the trans fluid with Honda fluid. Others suggest read the TCU codes by jumping a cable under the dash. I have these questions: 1. Can the TCU be reset by a simple battery cable disconnect on a 89 Prelude? If so, how long should it be disconnected? 2. Should I first attempt to read the TCU codes before resetting it? If so, does anyone know where I can get info on the Net as to what the flashing code numbers mean? 3. What should I do if the TCU is bad? Junkyard replacement? rebuilts? 4. Any other ideas? Thanks in advance for any thoughts. Link to comment Share on other sites More sharing options...
This topic is now archived and is closed to further replies.