AC Demand Out of Self Test Range (Ford)
What does P1464 mean?
The P1464 code means the vehicle's onboard diagnostic system has detected: AC Demand Out of Self Test Range (Ford). This is a low severity code.
Common Symptoms
- Check Engine Light illuminated during self-test only
- AC operation may seem normal during driving
- Scan tool reports AC demand signal out of range
- Intermittent AC compressor engagement issues
- Erratic idle speed when AC is turned on
Probable Causes (Ranked by Likelihood)
- AC was on during PCM self-test Very High
- Faulty AC demand signal circuit wiring High
- Failed AC clutch cycling pressure switch Moderate
- PCM software calibration issue Moderate
- Damaged connector at the CCRM (Constant Control Relay Module) Low
Step-by-Step Diagnostic Procedure
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Ensure the AC is turned off before running the PCM self-test. Clear the code and retest with AC off.
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Check the AC demand signal wire from the HVAC control panel to the PCM for continuity and proper voltage.
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Inspect the CCRM connectors for corrosion or loose terminals.
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Verify the AC clutch cycling pressure switch operation by monitoring it with a scan tool during AC operation.
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Check for any TSBs or PCM recalibration updates from Ford for your specific vehicle.
Frequently Asked Questions
Why did I get P1464 during a self-test?
The most common cause is simply having the AC turned on while the PCM ran its self-test. The test expects the AC demand signal to be off. Turn off the AC, clear the code, and rerun the test.
Does P1464 affect my vehicle in normal driving?
In most cases, no. This code is primarily a self-test code and usually does not indicate a problem during normal operation. If AC performance is normal, the code likely was set during testing conditions.
What is the CCRM on a Ford?
The Constant Control Relay Module controls multiple engine functions including the AC compressor clutch, cooling fans, and fuel pump relay. A faulty CCRM can cause multiple electrical issues.