21175-1064 ECU

[greenbarn]

Sounds like great news.

[gary]

I tried everything I could with a wiring diagram from the VDR sight. Finally I ran across the pcarrell link to the service manual. While reading the service book I realized I had probably fried the ECU, injectors, relay, fuel pump and maybe a few more items because I haven't worked on any of my bikes in about 17 years. Attacked the problem like I was working on a shovelhead. Today I tested items properly and found the DFI relay to be bad. I opened it up, tweaked it a bit, taped it back together and the bike fired right up. If the relay is bad enough the ECU mod wont get power to perform a self check. A new relay is on the way and its probably a miracle I didn't short anything. Thanks for your suggestion and help.

[Troll]

Good luck...

[gary]

That sounds like a go. Looking at the pin chart now. I've learned a lot since yesterday. Now to go forward from here with hopes that I haven't shorted out every module on the bike. Thanks for the tip. I will be trying that.

[Troll]

Common problem #1...Ignition switch. Happened to me, and several others I know of...There is a circuit in the EFI ign. switch that goes to the "unused" pin on the ECU that sends a low voltage signal to let the ecu know that the switch wasn't bypassed. Without it, the fuel pump won't turn on. Test...simple enough. run a wire to ground from the GROUND SIDE of the fuel pump electrical connector. Pump will run, bike will start. The ecu completes the ground circuit for the pump, if it sees the signal on pin 5..if it doesn't , it won't.

[gary]

Fuel pump not pumping. Had FI light on until I taped the top of the DFI relay. Still no fuel pump. All fuses are good and good connections all around. Everything ohms good from the ignition switch. Bench test on the fuel pump and it works properly. Down switch module is in position. Good battery. ECU module does not respond to the ECU code check (no FI light at all). Ordered a new DFI relay, cheap enough since it responded to the tap. I think my ECU is dead. I've had a wont start problem for years but the problem is so intermittent it couldn't be diagnosed at a shop. Did the if it ain't broke don't fix it thing till it stayed broke.

[Troll]

Probably not...what's the issue?

[gary]

Is there a way to bench test a 99 drifter ECU module?