Question about 1999 Hyundai Sonata
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Posted on Jan 02, 2017
SOURCE: engine code p0115
The Engine Coolant Temperature (ECT) sensor is located in the coolant passage of the cylinder head. The ECT sensor is a variable resistor whose resistance changes as the temperature of the engine coolant flowing past the sensor changes. When coolant temperature is low, sensor resistance is high; when coolant temperature is high, sensor resistance is low. The Engine Control Module (ECM) checks ECT sensor voltage and uses the information to adjust fuel injector pulse width and ignition timing. When the temperature sensed is very cold, the ECM enriches the fuel mixture and advances ignition timing. As coolant temperature rises, the ECM reduces the amount of enrichment and timing advance. P0115 is set when the ECM doesn't see this resistance (usually an open circuit) which usually means the sensor is burned out when there's nothing wrong with wiring and connections between the sensor & the ECM.
Posted on Jun 02, 2009
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