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MONITOR DESCRIPTION The Engine Coolant Temperature (ECT) sensor is used to monitor the ECT. The ECT sensor has a thermistor with in resistance are reflected in the output voltage from the sensor. The ECM monitors the sensor voltage and uses this value to calculate the ECT. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the ECT sensor and stores a DTC. Example: If the sensor output voltage is more than 4.91 V for 0.5 seconds or more, the ECM determines that there is an open in the ECT sensor circuit, and stores DTC P0118. Conversely, if the voltage output is less than 0.14 V for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and stores DTC P0117. If the malfunction is not repaired successfully, a DTC is stored 0.5 seconds after the engine is next started. MONITOR STRATEGY Related DTCs P0115: ECT sensor range check (Fluctuating) P0117: ECT sensor range check (Low voltage) P0118: ECT sensor range check (High voltage) Required Sensors/Components (Main) ECT sensor Required Sensors/Components (Related) - Duration 0.5 seconds MIL Operation Immediate TYPICAL ENABLING CONDITIONS Monitor runs whenever following DTCs not present None TYPICAL MALFUNCTION THRESHOLDS P0115 ECT sensor voltage Less than 0.14 V, or more than 4.91 V [More than 135°C (275°F), or less than -60°C (-76°F)] P0117 ECT sensor voltage [ECT] Less than 0.14 V [More than 135°C (275°F)] P0118 ECT sensor voltage [ECT] More than 4.91 V [Less than -60°C (-76°F)] COMPONENT OPERATING RANGE 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0115,P0117,... |