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ENGINE MANAGEMENT SYSTEM - V8 DESCRIPTION AND OPERATION 18-2-19 Input/Output There are three types of thermostat monitoring sensor diagnostic checks: l Sensor signal is above maximum threshold. For the ECM to register this as a fault, and illuminate the MIL, the ° C (284 ° F) for more than 1 second. l Sensor signal is below minimum threshold. For the ECM to register this as a fault, and illuminate the MIL, the ° C (-27 ° F) for more than 1 second, while the inlet air temperature reading is greater than -32 ° C (-25 ° F). l Signal difference between ECT sensor and thermostat monitoring sensor is below maximum threshold. For the l No maximum or minimum threshold signal faults exist. l No faults are recorded against the thermostat monitoring sensor or vehicle speed signal. l Engine not in idle speed control. l Fuel cut-off not active. l Engine speed is greater than 400 rpm. l Road speed is greater than 0 mph. l Integrated mass air flow from engine start to fuel cut-off is greater than set value (between 3 kg and 10 kg l Engine coolant temperature at engine start is between 9 ° C and 39 ° C (48 ° F and 102 ° F). l High range is selected. l Delay time before thermostat monitoring is enabled is between set limits (between 50 and 500 seconds l Engine coolant temperature is greater than 90 ° C (194 ° F). l The difference between the ECT sensor reading and the thermostat monitoring sensor reading is less than ° C (102 ° F). |