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What is the cause of the DM1 fault in a bulldozer engine?

1 Answers

DeMackenzie

07/30/25 8:12am

Engine operates normally under no-load conditions, but exhibits slow acceleration, lack of power when climbing slopes, and insufficient power even when the accelerator pedal is fully depressed under load. The engine speed fails to increase adequately and cannot reach maximum speed. Engine load is a numerical parameter measured in milliseconds (ms) or percentage (%), with a typical range of 1.3~4.0ms (at idle) or 15%~40%. The engine load is calculated by the control unit based on sensor parameters and displayed via intake pressure or fuel injection quantity. Observing engine load at idle is commonly used to diagnose potential vehicle faults. The injection time for engine load is a purely calculated theoretical value. At idle, it can be understood as the minimum fuel injection quantity required for the engine to overcome its own friction and accessory drive mechanisms. The injection time for engine load and basic fuel injection quantity are solely related to engine crankshaft speed and load, excluding fuel injection corrections.

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