I took out and opened my DB157 p06 cry due to having a delayed fuel pump priming issue and after replacing the fuel pump the issues still occurred so I decided to open the ecu and found a diode was burned and a capacitor may be spilling but I can’t identify what kind of diode it is. Attached are pictures of the diode. What kind is it? Are there any diagrams to show the schematic?

 

I don't have access to schematics for ECU or SRS modules. I recommend removing the diode to get the part number off the diode itself, get the OEM specsheet & test it out of circuit to see if the bias voltage drops are in spec. Test it with a DMM in both Ohms & diode modes. A few solder joints on your board look like they might be cold & need to reflow the solder. The diode may be OK, even with the hot spots there. You can clean up the PCB with q-tips & isopropyl alcohol. I would make an effort to get the original part #, not a cross-ref replacement for it. Semiconductors made back in the day were probably manufactured by companies that were bought out by other companies. Use the original specs for the part# to compare the bias drops on voltages, not any 'cross-reference' replacement offerings. Get an exact electronic replacement if you can. Your hot spots may just be where an overcurrent is flowing, not necessarily where the original problem lies. 30+ year old caps are in their FAFO period now, so they need to be changed as they'll surely cause problems at some point. Cold solder joints & caps are likely suspects for overcurrent hot spots on the board. Take a close look at your resistors too, especially the low ohms & higher wattage ones, as they probably serve as shunts- & may be the cause of an overcurrent elsewhere. Pull one side off the board & measure resistance to make sure they're in tolerance.
I had trouble finding a replacement in the US for the FE5D ultrafast diode that blew in my SRS module. It most likely serves the purpose of voltage regulation rather than rectification even though some data sheets call it a rectifier & the general ceramic ball form shows up in image searches described as an avalanche diode, although the term avalanche diode wasn't commonly used until the 2000s. I could only find new FE5D versions made in India or China & they looked like junk, plus I wasn't comfortable with using their sales platform & would have to wait at least 30 days for them to arrive, if they arrive. Long story short, I found an Ebay seller located in Italy who was selling 'new old stock' in quantities of 5 of the FE5D with 'GI' manufacturer code made by the original General Instruments that made my OEM diode. They're supposed to arrive by May 19th. I'm stoked that they are exact replacements for it, as I've learned the hard way cross reference replacement semiconductors may technically work, but they are often noisy in circuit & not very good replacements for the original uses compared to OEM of the same part# by the same manufacturer. Going by the date code on the new ones I bought from Italy they were were made a couple years prior to the one in my SRS module. I'll be sourcing replacement capacitors locally & swapping out all that I can with the exact voltage & uF specs. Good luck!