Does that hold true with the newer control modules too? I was hoping to skip the testing and go directly to replacing the control module and then see if that fixes it before replacing any glow plugs....BTW, a defective glow plug can damage a new replacement module-so don't replace a specific single glow plug based on DTC info-then find the problem is still present -then replace the module only to have the undiagnosed defective glow plug destroy your new module. Doktor A
I guess I'm just getting impatient and didn't want to have to bother testing them. It looks like there are two tests, using either a fuse or a multi-meter. I'll read up on that.... It is very easy to measure glow plugs for failed shorted or open. ...
Use the multi-meter method. Values of glow plugs can be found here...It looks like there are two tests, using either a fuse or a multi-meter. I'll read up on that.
there's also the sage advice to leave well enough alone and only replace what's broken.
I ordered the kit (5 glow plugs and the control unit) from Europarts-SD, so I'll plan on just changing everything out and keep my fingers crossed that I don't break one. It sounds like it's hard to go wrong if I follow all the advice to go slow and limit the torque as I remove them....It makes no sense to not change it all out since it's only $50 for five good quality, brand new, glow plugs.
Looks like I was making a mountain out of a molehill. My glow plug kit hasn't arrived yet but I got impatient and took a stab at removing the glow plugs. The clips came off easily with a narrow pair of needle-nosed pliers and the first glow plug I tried (#2 seemed to have the best access) came out smoothly. The next one was giving some resistance so I sprayed some PB Blaster and warmed up the engine to 170º. Without waiting for the engine to cool, I removed the remaining four glow plugs without exceeding more than about 15 Nm of torque (guessing).
Ironically, it looks like getting at the bolts that hold down the control module might be tougher than removing the glow plugs.