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HOMESERVICE MANUALSFORD2007FUSION SEL, 2.3 Z, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 861 (ENGINE CONTROLS - DESCRIPTION AND OPERATION - (HYBRID))ENGINE CONTROL COMPONENTSAIR CONDITIONING EVAPORATIVE TEMPERATURE (ACET) SENSOR
2007 Ford Fusion SEL, 2.3 Z, Standard

Air Conditioning Evaporative Temperature (ACET) Sensor

2007 Ford Fusion SEL, 2.3 Z, StandardSECTION Air Conditioning Evaporative Temperature (ACET) Sensor
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The ACET sensor monitors the evaporator air discharge temperature. The ACET sensor is a thermistor device in which resistance changes with temperature. The ACET sensor is used to more accurately control A/C clutch cycling, improve defrost/demist performance and reduce A/C clutch cycling. The electrical resistance of a thermistor decreases as the temperature increases, and the resistance increases as the temperature decreases. The PCM sources a low current 5 volts on the ACET circuit. With signal return (SIG RTN) also connected to the ACET sensor, the varying resistance affects the voltage drop across the sensor terminals. As the A/C evaporator air temperature changes, the varying resistance of the ACET sensor changes the voltage the PCM detects.

ACET SENSOR VOLTAGE AND RESISTANCE

°C °F Volts Resistance (K ohms)
100 212 0.47 2.08
90 194 0.61 2.80
80 176 0.80 3.84
70 158 1.05 5.34
60 140 1.37 7.55
50 122 1.77 10.93
40 104 2.23 16.11
30 86 2.74 24.25
20 68 3.26 37.34
10 50 3.73 58.99
0 32 4.14 95.85
-10 14 4.45 160.31
-20 -4 4.66 276.96
RENDER: 1.0x

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