ECM Reporting Capabilities by Make

Cummins Engine Company ECM
The Cummins electronic fuel injected highway engines have had the option of a "Road Relay" dash mounted display since 1993. This display is a sophisticated trip computer that can also advise the driver of engine related problems.

If the truck is equipped with this Road Relay option, the hard stop information is available for downloading and reporting.

Cummins is on their fourth reiteration of this dash mounted display device and it is called the Road Relay 4.

The earlier Road Relays could only show the number of panic stops in the last trip. The Road Relay 4 also shows 75 seconds of data that includes mph, engine rpm and the brake and clutch activity for the last three hard stops. It will also show the number of times the truck was coasting out of gear.

The hard stop feature is enabled from the factory and is set at a deceleration rate of 9 mph/sec. It is adjustable from 0 to 99 mph/sec. for the Road Relay 3 and from 0 to 30 mph/sec. for the Road Relay 4.

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