Isuzu N serie P0380 P064C

[alessioblaupunkt]

Isuzu N serie year 2017
This little truck with diesel engine, no way to solve
P0380 00 glow plug circuit
P064C 00 performance glow module

Changed glow plug, erase, same error.
Changed glow plug module, erase, same error.
Check wiring from glow plug to glow module OK.
Check wiring from glow module to ECU, OK.
Cleaned battery connection erase, same error.

Glow plug module has supply and ground.
Glow plug has silly voltage: 10.8V then 8.4V then 4V then 0V

As a result the "vehicle with spanner lamp" is ON in the dash.

Engine start fine, runs fine, drive fine.

Launch x431 find the fault, Brain Connex find nothing :palm:

[Meat-Head]

No however. It’s isusu so will be over complicated

either got some kind of inline residtor. Or measures voltage drop fromnoutput to plugs usingbthe wire as a shunt

iscthere any small wires rusty

[alessioblaupunkt]

There is no rust, only mud powder but not in the contacts.
I suspect bad ECU or there is something extra to erase but it's not listed in the "I changed this component" list.
I also tried to change the left battery, the one that gave the worst result in the test, but no way, fault reappear in 1 or 2 minutes after erase.

[Meat-Head]

Can you get technical data on current draw of each glow worm at each voltage