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ENGINE MANAGEMENT SYSTEM - TD5 DESCRIPTION AND OPERATION 18-1-15 The ECT sensor can fail the following ways or supply incorrect signal: l Sensor open circuit. l Short circuit to vehicle supply. l Short circuit to earth. l Incorrect mechanical fitting. l Signal fixed above 40 ° C (104 ° F) not detected. l Signal fixed below 40 ° C (104 ° F) not detected. In the event of an ECT sensor signal failure any of the following symptoms may be observed: l Difficult cold start. l Difficult hot start. l Driveability concerns. l Instrument pack temperature warning illuminated. l Temperature gauge reads excessively hot. l Temperature gauge reads excessively cold. In the event of component failure the ECM calculates coolant temperature from the fuel temperature sensor signal. If The MIL will not illuminate in an ECT sensor failure. |