W210 Glow Plug Relay schematic
 

Hello
Working on a 1996 E300 and have been having P0200 Injector Circuit Open for years.
Recent work; replaced the head and camshafts and wiring harness.
I thought that for sure the new harness would solve the persistent Injector Code.
And it did for awhile.
Now its back.
Toning out the wires at the Glow Plug Relay and the only problem it in the control wire plug where there is 5 wires. The wire labeled T is open (no tone - no ground)
Question is; does anyone have a wiring schematic for the glow plug relay control wires?
Attachment 167258

PM sent.

Wiring Diagram
 

ECT Sensor
 

According to the wiring diagram provided by our New Mexican friend the problem wire is the white wire to the ECT Sensor.
The question is; Should the white ECT wire from the Glow Plug Relay to the ECT read open? Or should it tone out as a ground?

I'm guessing not. The computer is telling you that something is open, and this is the only open wire you found out of the five?

Found this (https://www.youtube.com/watch?v=gPEkbXYi3P0):
http://www.peachparts.com/shopforum/...1&d=1694051807

I circled in red a sensor with what looks like a white wire running to it. This is towards rear end of the head. The #5 and #6 glow plug harness connectors are visible, as well as the upper end of the oil cooler and the pipe connecting it to the head. I can just see this area by looking through the gap between the oil filter housing and the intake manifold.

That wire is on the harness that was just replaced. The schematic shows that the wire in question goes to ECT sensor that is buried in the dashboard. Ugg. Terrible job removing the dash is.