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)X131 - CHECK FOR INTERMITTENT OPEN BETWEEN EATC MODULE AND PCM
1994 Ford Aerostar AWD V6-245 4.0L
X131 - Check For Intermittent Open Between EATC Module and PCM
1994 Ford Aerostar AWD V6-245 4.0LSECTION X131 - Check For Intermittent Open Between EATC Module and PCM
- Key "OFF".
- Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
- Install breakout box, leave PCM disconnected.
- Connect a non-powered test lamp between test pin 10 and test pin 40 at the breakout box.
- Key "ON".
- A/C "ON".
Pressure Switch Circuit:
- Observe test lamp for an indication of a fault while performing the following (the light will turn off when a fault is detected, indicating an open):
- Shake, wiggle, bend the AC Demand (ACD) / AC Clutch Supply (ACCS) circuit between the Electronic Automatic Temperature Control (EATC) module and PCM. The drawing above shows the portion of circuit to be checked.
- Lightly tap the cyclic pressure switch to simulate road shock.
- Disconnect and inspect the cyclic pressure switch connector and the EATC module connector.
- Is a fault indicated?
Yes -- Isolate fault and service as necessary. Remove breakout box. Reconnect all components. 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 -- Unable to duplicate fault at this time. Remove breakout box. Reconnect all components. Clear continuous memory. Clearing Diagnostic Trouble Codes
Return to Diagnostic Routines to service any additional symptoms. Symptom Related Diagnostic Procedures
RENDER: 1.0x
NO RELATED
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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.