Rabbitdawg
Cadet
- Joined
- Nov 29, 2012
- Messages
- 6
Working on an older K model Suzuki DT115 (1989) that had a hatchet job done on it by vandals while parked at a car dealer. I have got spark on all four cylinders and engine has good compression on all cylinders (130ish). My problem is the high pressure fuel pump will only power up sporadically. I have removed the high pressure pump and bench tested and it is free and works fine with 12V power. Occasionally while trying to troubleshoot it will act normal and come on for a couple of seconds and pressurize the fuel lines but most of the time it will do nothing. It will even crank up and run for about two seconds and then quit ater fuel pressure bleeds off (when the pump happens to get power). I have checked and cleaned all the grounds and even gone so far as to jump a separate jumper wire to the grounds from the battery neg while testing just to be sure. I've ohmed all the battery cables, they are good. Been a long time since I worked on one of these and my fading memory wants to tell me there are three things that have to happen for the CDI to function properly. Key on power, gear counter signal and something else. I've searched my notes from school (ten years ago now) and I can't find that info, also been through the service manual (factory) and the addendum, as well as some of the tech manuals that I have. What kind of voltage should the gear counter coil show when tested? Also forgot to mention that I have done the wiggle test on all the associated wiring and can't find a loose or bad connection. I am leaning towards a bad CDI module but I have had so few legitimate Suzuki CDI problems over the years that I doubt that really being the case. The module is about 1200.00 My biggest concern is for someone that works on them everyday to confirm for me all the inputs to the CDI that I am supposed to have.
