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Additional Data in Heavy Vehicle ECMs

In addition to the EDR data, there are a significant amount of other data saved by the ECM. Whether the data are beneficial to an investigation depends on the circumstances of the investigation itself.

All ECMs are built differently and are customizable by the end-user, and there are many items that can be found in the (typically) 30-120 pages of ECM reports before you get to the EDR data.

A few of the more interesting features of the ECM reports include:

• The active fault codes (problems with the engine)
• The audit trail for the truck, showing when changes were made to the electronic engine parameters
• An electronic maintenance record of the truck
• The speed at which the truck is governed, both by the accelerator pedal and cruise control system
• Information about compliant driving incentives, such as increasing horsepower to drivers who meet fuel-consumption goals.
• Detroit Diesel and Mercedes engines show the trucks’ usage pattern for the previous 30 days. This report should approximately match a driver’s log books.

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