On our ysm8 you have to have throttle at idle from memory as you have to fit fuel
rack thru hole but don't know 2QM 15.
FYI I rebuilt injection pump myself as they wanted $630 in diesel
shop & I did it for about $200. Only the plunger & barrels & delivery
valves are likely to be faulty if anything. I didn't think it was that hard to repair if you are clean & careful
But you need to be sure it's knackered, they might test it & say it's ok if they are trustworthy. I did NOT trust the place I took mine to for testing.
If you are doubtful about your ability to do it leave it to the experts. Look up Bosch PFR vid on you tube. Your pump is basically 2 side by side.
Dunno if "great wisdom" lol, describes this post but hopefully it helps
Your2QM15 is not much different but you do need to be careful