Coolant temperature sensor, engine management system
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Coolant temperature sensor, engine management system
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The task of the temperature sensor is to inform the engine control module of the current engine coolant temperature.
The temperature sensor has the following connections
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1.
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Signal, water temperature: Pin 1 on the temperature sensor is connected to pin 8 on the engine control module
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2.
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Sensor ground: Pin 2 on the temperature sensor is connected to pin 45 on the engine control module
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The engine coolant temperature sensor is located on top of the thermostat housing on the front right-hand side of the engine bay. It is an NTC sensor, power by 5 V from the engine control module.
The resistance of the temperature sensor changes with the temperature. The sensor resistance takes the following values:
20°C (68°F)
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2500 Ohm 6%
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100°C (212°F)
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186 Ohm 6%
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If the sensor input is short-circuited to B+, diagnostic trouble code P0118 will be generated.
If the sensor input is short-circuited to ground, diagnostic trouble code P0117 will be generated.
One minute after the engine is started, the coolant temperature is checked and compared with the oil temperature. When the oil temperature reaches 80°C, the control module waits 3 minutes. If the coolant temperature does not reach 70°C after these 3 minutes, DTC P0116 will be generated.
System reaction to a fault
P0117 and P0118.
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As soon as the control module detects a fault, the system uses the fuel temperature. -25°C is used for glow duration control and +50°C for calculating injection start.
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For DTC P0118, the reading on the diagnostic tool is 0°C.
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For DTC P0117, the reading on the diagnostic tool is 0°C.
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P0116
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As soon as the control module detects a fault, the substitute value 0°C is used.
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For DTC P0116, the reading on the diagnostic tool is 0°C.
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