Detroit Diesel 50 PWM
 

Howdy All,

First post for me (YAY)

Does anyone know where the PWM valve is on a D50 motor! I've looked everywhere! I'm Stumped!

Its throwing Flash Code 63 which means short on the + Side however I cannot find it, I've spent hours researching, even trying to buy one so i can compare but no luck..

Thanks, Moose

Welcome to the DTR, from what I can decipher (I'm not a Detroit guy so I may not be much help) the PWM valve I tied into the turbo setup to control the VGT nozzles (but that may be the 60 series setup too)

I found the 8 page troubleshooting guide seen here: http://www.ddcsn.com/cps/rde/xbcr/dd...SECM-03-83.pdf

hope it helps or someone smrter than me can actually help haha

Flash code 63 means that one of the PWM(Pulse Width Modulation) output wires from the ECM is either shorted to positive or a open circuit. I'm not familiar with the 50 series but here is a excerpt from a troubleshooting manual on flash code 63
http://dmbruss.com/images/Schematics..._PWM_Fault.pdf

I Forgot I even posted up here, Thanks to Everyone..

The problem is these engines have many applications.

So far I've found the following

1 - PWM can be used to control a fan (Not in my case) - Fan is on the crank.
2 - PWM can be part of the Glow Plug System (Not in my case) - No Glow plug system, Uses Ether to start and pure compression.
3 - PWM is part of the EGR system (I dont have that either).

This motor has the Detroit Ether start unit, I've ordered a new can just incase its a flag triggered by an empty ether can (Standard install on this application).

I've read the DDR and D50 manuals, I cannot obtain the specific manual for the application as its on a bus and cities either throw the manuals away or staff take them and leave in their attic for ever :)