GMC Repair: Injection pulse width error, powertrain control module pcm, powertrain control module

Question
'94 Silvarado 2500 4x4, 6.5 Turbo Diesel.I am getting an intermittent trouble code 36 -Injection pulse width error(response time long). I have replaced EGR pressure/Baro sensor and MAP sensor and module on side of Stanadyne Injection pump(PDM I think) is about 4 months old. Symptoms- This happens more when engine is not up to operating temperature and almost goes away at normal temperature. Service engine light comes on when accelerating and goes off when I let off throttle. Engine performance does not seem to change and no white or black smoke from exhaust. Is the Injector pump going out or is there another sensor that can control this and cause the long response tine? What sensor or what condition causes a long response time from the computer? Is this an injector pump timing issue or injector pump solenoid issue(sticking or worn out)? With response time long, is the injector injecting too much fuel? Please help.

Answer
Hi
36 is an internal Pump fault. It is the Fuel Solonoid portion of the pump.
The fuel injection driver (PMD Pump Mounted Driver) receives an inject command signal from the Powertrain Control Module (PCM) and provides a current regulated output to the fuel solenoid that controls injection. It also returns an injection pulse width signal back to the PCM to inform it when the fuel solenoid has actually seated. This injection pulse width signal is measured in micro seconds.The injection pulse width will fluctuate when throttle is depressed.
A weak (mechanical failure) fuel solenoid will result in DTC 36.
I would also if money permits, purchase an aftermarket FSD Cooler. This device keeps the PMD off the pump and keeps it cool to extend the PMD's Life.
It may not be giving you problems now, but the Fuel Solonoid seat will continue to get worse. You'll get black smoke when it starts going out.
Have your diesel tech check the API of fuel, just to double check fuel quality.
Good Luk and hope it helps
Just suggestions from 19 years of GM experience.
Paul