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 MANUALSFORD1994AEROSTAR AWD V6-245 4.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSX - CONSTANT CONTROL RELAY MODULE (CCRM)X130 - CHECK FOR CAUSES OF FAST A/C COMPRESSOR CYCLING
1994 Ford Aerostar AWD V6-245 4.0L
X130 - Check For Causes of Fast A/C Compressor Cycling
1994 Ford Aerostar AWD V6-245 4.0LSECTION X130 - Check For Causes of Fast A/C Compressor Cycling
Continuous Memory Diagnostic Trouble Code (DTC) 381 indicates frequent A/C compressor clutch cycling.
To set DTC 381 the AC Clutch Supply (ACCS) input to the Powertrain Control Module (PCM) (Pin 10) must change states in less than 8.5 seconds, and do so at least 10 times with few "good" (>8.5 seconds) cycle times in between.
Possible causes:
- Mechanical A/C system concern (ex. low refrigerant charge, damaged cyclic pressure switch, etc.)
- Intermittent open between the Electronic Automatic Temperature Control (EATC) module and the Pin 10 input (ACCS) to the PCM.
- Refer to Heating and Air Conditioning to test A/C compressor clutch cycle times, and to check causes of fast clutch cycling.
- Is a fault indicated?
Yes -- Service as required. Clear continuous memory. Clearing Diagnostic Trouble Codes
Start engine and turn A/C on for about 2 minutes. Engine "OFF", A/C "OFF". Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)
No -- Go to X131 (to check for intermittent electrical concern). X131 - Check For Intermittent Open Between EATC Module and PCM
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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.