I didn't know exactly what relay that was before, but it brings back a memory.
https://www.rav4world.com/threads/fuse-box-is-missing-c-opn-fuse.189337/
"C/OPN is the fuel pump control circuit relay"
Quote:
Originally Posted by Lexus4321
ECM will not engage C/OPN relay unless ..
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Apples vs. old oranges....but similarly I once had an '89 VW Golf which tended to randomly die, sometimes in traffic, at an intersection while rush hour waited, on the way to work.
The car also had an unfixed coolant problem which added to the problem solving.
It popped the bypass climate radiator spraying fluid inside the car and in my face on a 100deg day on the bridge.
Had to bypass the interior climate heat radiator with plumbing elbows and a hose from a hardware store a mile away.
Keeping it from overheating was an ongoing thing. Three different thermostats and a radiator didn't fix it.
Sitting in stuck California traffic with the hood cracked, fan on high, and all windows down was hell.
Once it was running it usually stayed running.
Hot restart was usually a problem especially on hot days for some reason, which led me down the wrong path.
I was looking at the twice-changed fuel filter, and then fuel pump, and then lines for vapor lock, and then into replacing coil and crank sensor.
It finally turned out to be the burned up Bosche relay which still worked 90% of the time.