SWAMP'S DIESEL PERFORMANCE & TECHNOLOGY

REVERSE ENGINEERING: 7.3l POWER STROKE INJECTOR DRIVER MODULE

 

Project Overview

Desoldering Components

IDM Models

Printed Circuit Board Details

Component Identification

Circuit Tracing & Component Symbols

Completed IDM Schematic

Sub-Circuit Analysis

Injector Waveforms

HIGH-PERFORMANCE IDM'S

IDM TESTING & REPAIR

Right --> IDM-110 with cover removed.

In July of 2003, Dave and I began building the first test or prototype sets of injectors; in March of 2005 we began custom tuning of the PCM to get the best possible performance out of our injectors; in September of 2006 we turned our attention to what was between the PCM (tuning) and the injectors--the Injector Driver Module.

At the time, all we knew about it was that it took 12 V DC and stepped it up to 110 V to fire the injectors, and we knew how to increase the voltage to 140 V. (Neither one of us knew anything about circuits, semiconductors, circuit boards or electronics. Zero. Zilch. Nada.)

Considering the job the IDM has to do--fire injectors at 110 VDC; the environment it has to do it in--from sub-zero startup in Alaska to engine compartment temperatures in Arizona in the summer, combined with road and engine vibration; how often it does it--over a thousand times a minute; how fast it does it--firing in injector for .002-.003 seconds (2-3 milliseconds); and how long it lasts--250,000 miles could mean 250,000,000 injector firings, the designers did a pretty darn good job when they built the IDM. Over half of the IDM failures we see were caused by water getting inside the case.

(Aren't you glad you don't have to replace your IDM as often as you have to replace the Cam Position Sensor?)