| Author | Message | ||
     Sanchez |
Well, it finally happened. After 29,324 miles, my Ulysses finally stranded me. The problem appears related to the fuel pump. When I turn on the kill switch, I get the following: - The check engine light blinks instead of staying on - The interactive exhaust servo cycles over and over again continuously - The fuel pump does not prime I'm guessing there's a short either in the fuel pump wiring or the harness leading to the pump. If I disconnect the pump, the CEL comes on normally and the servo cycles once as it should. The CEL is not blinking trouble codes. It's just a continuous fast blink. ECMSpy won't pull codes unless I disconnect the fuel pump. It reads a "trouble code 33 fuel pump shorted to ground or open" at that point, but that's to be expected with the pump unplugged. Has anyone encountered this before? | ||
| Darthane |
Check engine lamp blinking continuously, accotding to my '03 Firebolt service manual, is "to warn of potentially damaging engine operating temperatures." You might have a short in your cylinder head temp sensor. As resistance to ground in this line goes down, the ECM reads the temperature as being higher. It's possible that it will not let you start the bike because it thinks it's overheated. You could try pulling codes the old-fashioned way (jump the diagnostic connector pins) and see what the CEL tells you. The engine temp sensor is located on top of the rear cylinder head. Actually pretty easy to get at - just pull the airbox. I realize the fuel pump disconnect thing doesn't jive with the theory, but I can't find any reference to the CEL acting like that in my '08 manual (or any trouble code diagnostics at all, annoyingly). (Message edited by darthane on May 25, 2009) | ||
| Mastros2 |
There is a known problem with the 2006 fuel pumps and chaffed wiring. | ||
| Froggy |
Didn't you recently repair your fuel pump wires? Perhaps one of the repairs gave? | ||
| Id073897 |
"shorted to ground" would make the fuel pump run continously. Check BN/Y cable at fuel pump plug for continuity to ECM (black 3) and ground. But I guess you won't find an error there. Check GY cable that +12 volts is provided. GY is a common voltage supply for ECM, diagnostic plug, injectors, coil and fuel pump. It's getting it's power from the ignition relay, pin 87. Check and clean ignition fuse too, as this is the supply for the ignition relay, pin 30 (GY/0). Probably the ECM is rebooting constantly due to low voltage. A chafed and grounded power supply wire inside or outside the pump might be the reason. (Message edited by id073897 on May 25, 2009) | ||
| Sanchez |
> Probably the ECM is rebooting constantly due to low voltage. That helps. The blinking CEL and cycling servo really confused the issue. I swapped the ignition and aux relays, and the bike started right up. Then I swapped them back ... and it started right up. ARGH. My kingdom for a repeatable problem with a definitive fix. So either there was some problem with the contact on the relay, or there's a broken wire between the fuse box and the ECM, and I wiggled it back into place while messing with the relays. I wiggled it around some more and even took the fuse box loose from the frame, but I can't make it die again. This is maddening. I wish I'd thought to check the relay while I was broken down on the side of the road. It would've saved me several hundred dollars.  | ||
| Id073897 |
So either there was some problem with the contact on the relay, A high resistance would explain the effect, so as soon as the fuel pump is activated, voltage is dropping sharply, but then I would have expected the contacts sticking or welded together at last. I think it would be a good idea to replace the old ignition relay. | ||
| Hughlysses |
Dang Sanchez- sorry for your trouble. I guess that's a good reminder for all of us- any time an electrical problem is suspected, one of the trouble-shooting steps should always be to re-seat all the relays. | ||
| Sanchez |
I bought three new relays yesterday, which was all the dealership had in stock. They were only about $4/each, so it was a cheap fix. The bike died again leaving the dealership, but it started back up, so I just rode it home. After replacing the relays, I rode about 150 miles today with no problems. Fingers crossed this fixes the issue for good. |
