For example, BARO is used to calculate MAP/MGP base line.
In some cases, the PCM uses one voltage input to calculate a base line for other sensor readings. All readings which are not displayed in volts are what the PCM calculates those sensor inputs equal. One thing to understand and remember is the PCM reads only voltage signals from the sensors. By installing a 104-pin Break-out Box and using a DVOM or lab scope you can read most of the inputs and outputs in voltage or duty-cycle.
#7.3 injector driver module fails when warm upgrade
If you are unable to upgrade the computer in a 94 truck, it is still possible to diagnose, just not as easy. This way not only are you able to retrieve trouble codes, but also run the injector buzz test, cylinder contribution test and monitor data stream and "snap shot" readings during a test drive. By manipulating the accelerator pedal during the KOEO test, it was possible to activate an injector actuation (buzz) test, but the best way to fully diagnose these is to replace the computer with a 95 level one. Unfortunatly, the 94 vehicles, while equiped with an OBD II data link connector, were actuatly EEC IV and had no data stream. The easiest way to diagnose the PowerStroke is with an OBD II scan tool that has data stream capabilities. I've broken this page down into the following sections:Īlso see my Bulletins Page for additional diagnosis and repair information and parts listing.įor older diesel diagnosis and repair tips see my 6.9/7.3 IDI Page. Over the past four years I have seen common problems and have come up with techniques for working on this engine. One of my primary tasks where I work is diagnosing PowerStroke driveability concerns. On this page I plan on posting diagnostic and repair procedures to help other technicians who may not be familiar with the Ford/Navistar PowerStroke. Diagnostic and repair tips for Ford PowerStrokes diesels
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