Diode question

[auke]

Hey guys, I'm stuck!
1993 Miata. Diode from the computer is burned out.
Location: Hold computer with yellow plug facing away from you.
On the top left-hand-side is a row of three diodes, D001, D002 and D003.
D003 is burned.
I am seeking the spec / ID number of D003.
All three diodes appear to be the same, black with a blue ring and the letter C on them.
Any info would be much appreciated.
Thanks!

 

[kcbhiw]

I'm going out on a limb here primarily as the diodes in my spare ECU are labeled D001,3,4 respectively from left to right:

It appears that the 3rd diode from the left is reverse biased from ground to B+ (Battery) with no resistor. I suspect it's in place for reverse battery polarity protection to pop the main fuse. I don't recognize the markings and I can't find it on any search. I suspect it's a Zener and haven't a clue on what the voltage rating might be.

From what I can tell and if there are no underlying issues, completely removing this diode from the circuit shouldn't have any effect on operation. What sort of problems are you experiencing?

 

[auke]

When warmed up, deceleration is followed by the engine almost cutting out when you put the power back on.
Mine are marked D003, D001, D002 from left to right.