LINES GP-AIR 2Z1880 - Caterpillar

electronic control module (ECM) determines the engine speed by measuring an electrical signal from the engine speed/timing sensor. The sensor is located on the flywheel housing. The sensor is adjacent to the left camshaft drive gear. If engine speed exceeds 2200 rpm, a warning is generated. The warning will remain active until the engine speed drops below 2100 rpm. The peak engine overspeed is above 2200 rpm. The peak engine overspeed is logged in the permanent ECM memory. The peak engine overspeed is logged as a histogram in order to quantify the magnitude of the engine overspeed. This provides information in order to assess the potential level of engine damage. The overspeed histogram is separated into five separate rpm ranges: 2200 to 2400 rpm, 2400 to 2600 rpm, 2600 to 2800 rpm, 2800 to 3000 rpm and greater than 3000 rpm. Factory passwords are required to clear this information.