Help with MS...
#1
Help with MS...
Alright, here's the deal. Due to a little to much beer during my MS install I managed to connect the MS grounds to a powered wire in the Miata harness... now the MS will not power on. No signs of anything damaged, neither visual nor by sniffing. It did power on prior to the mishap, I was swapping wires to address a connectivity problem and was hoping for a better ground.
I'm looking for someone that is trustworthy and knowledgeable that is willing to take a look at it for modest compensation... or someone willing to trade as-is for an FMU with a few disks.
This was a pre-assembled unit purchased from Protocar. But they don't seem to like answering emails...
I'm looking for someone that is trustworthy and knowledgeable that is willing to take a look at it for modest compensation... or someone willing to trade as-is for an FMU with a few disks.
This was a pre-assembled unit purchased from Protocar. But they don't seem to like answering emails...
#7
"4. Next, you are going to install the components that make up the power supply, and then verify operation. The first part to install is the 'Perry' Metal Oxide Varistor MOV1 {P7315-ND}. This is a large flat disc, about an inch (~25mm) in diameter. It is soldered near the DB37 connector, and does not have a polarity, it can go either way around. This part protects the MegaSquirt from surges on the 12 volt line. "
#13
Elite Member
iTrader: (1)
Join Date: Jun 2006
Location: Warrington/Birmingham
Posts: 2,642
Total Cats: 42
Step 23 tells you how to check the power supply circuit. this will confirm that section isn't fried. Step 26 will tell you how to check the serial comms.
That's as much as you can test sans processor afaik.
#18
Measure for continuity across D19 (5.6V Zener). If it reads as shorted in both directions, remove it and apply power. Replace it if you want to maintain short circuit protection.
I accidentally shorted, IIRC, 12VDC to ground on the MS and popped that diode. It's there for short circuit protection anyway.
I accidentally shorted, IIRC, 12VDC to ground on the MS and popped that diode. It's there for short circuit protection anyway.