DTC P0537: A/C Evaporator Temperature (ACET) Circuit Low Input
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. 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 DJ: Air Conditioner Evaporator Temperature (ACET) Sensor STEP DJ6. | GO to DJ: Air Conditioner Evaporator Temperature (ACET) Sensor STEP DJ6. | GO to DJ: Air Conditioner Evaporator Temperature (ACET) Sensor STEP DJ9. |