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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1784 (Engine Controls - Powertrain DTC Charts And Descriptions (Except Diesel & Hybrid)) >> DTC Diagnosis >> P0537 - A/C Evaporator Temperature Sensor Circuit Low

P0537 - A/C Evaporator Temperature Sensor Circuit Low

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P0537 - A/C EVAPORATOR TEMPERATURE SENSOR CIRCUIT LOW

Description:  Indicates the ACET signal input was less than the self-test minimum. The self-test minimum is 0.13 volts.
Possible Causes: 
  • ACET circuit short to ground or SIG RTN
  • Damaged ACET sensor
Diagnostic Aids:  The powertrain control module (PCM) sources a low current 5 volts on the ACET circuit (this voltage can be measured with the sensor disconnected). As the A/C evaporator air temperature changes, the ACET circuit resistance to SIG RTN (ground) changes (which changes the voltage the PCM detects). When the ACET signal is detected below the self-test minimum, check for shorts to the SIG RTN or ground, which would pull the voltage low.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All refer to PINPOINT TEST DJ .
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