Pull Chrysler Engine Trouble Codes Without A Scan Tool<\/strong> <\/a><\/li>\n<\/ul>\nThe most common reason for this would be a failed Engine Coolant Temperature Sensor.<\/p>\n
Coolant Temperature Sensor Operation<\/h2>\n
The coolant temperature sensor is a thermistor; a temperature controlled variable resistor with a range of \u221240\u00b0\u2013265\u00b0F (5\u00b0\u2013129\u00b0C) mounted in the engine coolant stream. The PCM uses the temperature input to adjust the fuel mixture slightly richer and raise the idle speed, until normal operating temperatures are reached. On all models, this sensor is also used to control the cooling (radiator) fan operation.<\/p>\n
The PCM supplies 5.0 volts to the coolant temperature sensor. The sensor provides an input voltage to the PCM. As coolant temperature varies, the sensor resistance changes resulting in different input voltage to the PCM.<\/p>\n
When the engine is cold, the PCM will demand slightly richer air\/fuel mixtures and higher idle speeds until normal operating temperatures are reached.<\/p>\n
The coolant temperature sensor changes resistance as the coolant temperature<\/span> increases and decreases.<\/p>\n
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I recently replaced the ignition unit on my car after the engine would die while warming up and never start again until the engine would completely cool down again. Since replacing the unit the engine will die a couple of times but restart and continue to run after reaching full operating temperature. Can you tell me why this is happening and how to correct it completely?<\/p>\n