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Evaporator Temperature Sensor 7/41: Notes

The evaporator temperature sensor sends the current evaporator temperature to the engine control module (ECM) via the climate control module (CCM). The engine control module (ECM) then determines whether the compressor should be started.

Fig 1: Evaporator Temperature Sensor
GLL153598Courtesy of VOLVO CARS CORPORATION

Type 

Temperature-dependent, NTC resistor (negative temperature coefficient).

Characteristic 

Resistance between terminals #29 and #38 on the breakout box should be 3.44 kΩ at +20 °C. Resistance decreases as temperature increases.

Other information 

Diagnostic trouble code B1B7115 is generated upon short circuit to supply voltage or open circuit.

Diagnostic trouble code B1B7111 is generated upon short circuit to ground.