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Feb 18, 2017 | 08:09 PM

#121

Bubba Jones

Fleet Mechanic

Joined: Dec 2006

Posts: 1,925

Likes: 10

From: Phoenix, AZ

Quote:

Originally Posted by ReBilld

Good job suggesting the diode Max! I have never seen one go bad and it didn't even cross my mind! Reps sent!

Well thank you! I'm not familiar with how a diode is constructed but I would guess the chip may have played a part in messing eith the diode with it potentially being loose and all.

Feb 18, 2017 | 09:08 PM

#122

oldbird1965

Fleet Owner

Joined: Aug 2004

Posts: 20,419

Likes: 197

From: AZ

Quote:

Originally Posted by ReBilld

There is a diode in the distribution box under the hood.

I think I know what you mean now. Wondered what that was, never heard it mentioned before.

Feb 19, 2017 | 08:44 AM

#123

madpogue

Lead Driver

Joined: Oct 2003

Posts: 8,476

Likes: 37

From: Madison, WI

+1; interesting finding. I could see it causing a no-start if it failed by opening the circuit completely. But failing by allowing current both ways, I wouldn't have expected a no-start. The PCM must have some self-protection built into it, where it doesn't power up if that diode is allowing current in both directions. A study of the EVTM diagram(s) might shed some light how this works.