Wide Open Throttle AC Cutoff Circuit Malfunction (Ford)
What does P1460 mean?
The P1460 code means the vehicle's onboard diagnostic system has detected: Wide Open Throttle AC Cutoff Circuit Malfunction (Ford). This is a low severity code.
Common Symptoms
- Check Engine Light illuminated
- AC does not disengage during hard acceleration
- Reduced engine power under full throttle with AC on
- Occasional stalling when AC engages at idle
- Poor acceleration performance
Probable Causes (Ranked by Likelihood)
- Faulty throttle position sensor signal Very High
- Damaged wiring in the AC cutoff circuit High
- Failed AC cycling pressure switch Moderate
- Faulty PCM relay output for AC control Moderate
- Corroded connector at the AC clutch relay Low
Step-by-Step Diagnostic Procedure
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Use a scan tool to monitor the throttle position sensor reading at wide open throttle. It should read between 4.0V and 4.5V.
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Check the AC cutoff relay and its wiring for corrosion, loose connections, or damage.
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Verify the AC cycling pressure switch is within specification using AC gauges and a multimeter.
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Test the PCM output signal at the AC relay connector while commanding WOT AC cutoff.
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Inspect the wiring harness between the TPS, PCM, and AC relay for shorts or opens.
Frequently Asked Questions
What is the WOT AC cutoff function?
The wide open throttle AC cutoff is a feature that temporarily disengages the AC compressor during hard acceleration. This frees up engine power when you need maximum performance, such as passing or merging.
Is P1460 an urgent repair?
No. P1460 does not affect engine safety or drivability in a significant way. However, it can reduce available power during acceleration and should be addressed for optimal performance.
Could this be related to a throttle position sensor problem?
Yes. The TPS signal tells the PCM when the throttle is wide open. If the TPS signal is inaccurate or erratic, the PCM may not correctly command the AC cutoff, triggering P1460.