Diagnostic testing of rapid heat up of an exhaust sytem during engine decompression

Abstract

A method and a device for performing diagnostics on a vehicle. The diagnostic system includes a sensor configured to sense an operating speed of an engine of the vehicle, a diagnostic output device, and an electronic processor. The electronic processor is communicatively coupled to the sensor and the diagnostic output device. The electronic processor is configured to activate and deactivate a decompression mode of the engine. The electronic processor acquires the operating speed of the engine from the sensor and determines an engine roughness based on the operating speed of the engine. When the engine roughness is below a threshold, the electronic processor sends a diagnostic signal to the diagnostic output device.

Dependencies are inferred from the claim text.