P0537 - A/C Evaporator Temperature (ACET) Circuit Low
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.
P0537 - A/C EVAPORATOR TEMPERATURE (ACET) CIRCUIT LOW
| Description: | Indicates the ACET signal input is less than the self-test minimum. The self-test minimum is 0.13 volt. | |||
| Possible Causes: |
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| Diagnostic Aids: | The 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 pull the voltage low. | |||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory | |
| All | refer to PINPOINT TEST DJ . | |||