DTC P0537: A/C Evaporator Temperature (ACET) Circuit Low Input
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2006 Mercury Mountaineer, 2006 Mercury Monterey, 2006 Mercury Montego, 2006 Mercury Mariner, and 2006 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P0537 - A/C EVAPORATOR TEMPERATURE (ACET) CIRCUIT LOW INPUT
| Description: | Indicates the ACET signal input was less than the self-test minimum. The self-test minimum is 0.13 volts. | ||
| Possible Causes: |
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| 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 | GO to Pinpoint Test DJ . | ||