Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2004ECONOLINE E150, VAN CARGO, 4.6 WREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS - CNG, FLEX-FUEL & GASOLINEDIAGNOSTIC TROUBLE CODE (DTC) CHARTSP0537 - A/C EVAPORATOR TEMPERATURE (ACET) CIRCUIT LOW INPUT
2004 Ford Econoline E150, Van Cargo, 4.6 W
P0537 - A/C Evaporator Temperature (ACET) Circuit Low Input
2004 Ford Econoline E150, Van Cargo, 4.6 WSECTION P0537 - A/C Evaporator Temperature (ACET) Circuit Low Input
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 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 5 | GO to DJ: Air Conditioner Evaporator Temperature (ACET) Sensor STEP 5 | GO to DJ: Air Conditioner Evaporator Temperature (ACET) Sensor STEP 8 |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.