Wierd PCM issue, looking for info
Thread Starter
TECH Veteran
iTrader: (4)
Joined: Nov 2001
Posts: 4,712
Likes: 0
From: Simi Valley, CA
Anyone know what the tach hookup wire (pin 10) does? Trying to diagnose my shift light problem I disconnected it, any to my surprise the car seemed to run fine (including my tach). I'm just wondering what that pin normally runs.

