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 MANUALSFORD1994F 150 2WD PICKUP L6-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSX - CONSTANT CONTROL RELAY MODULE (CCRM)X62 - ISOLATE FAULT TO PCM OR CCRM
1994 Ford F 150 2WD Pickup L6-300 4.9L
X62 - Isolate Fault to PCM or CCRM
1994 Ford F 150 2WD Pickup L6-300 4.9LSECTION X62 - Isolate Fault to PCM or CCRM
- Key "OFF".
- Breakout box installed, Powertrain Control Module (PCM) disconnected.
- Reconnect Constant Control Relay Module (CCRM) and A/C clutch.
- Key "ON", engine "OFF".
- A/C demand switch to "A/C" on position.
- Connect jumper between test pins 54 and 40 at the breakout box.
- Disconnect and reconnect jumper several times while listening to the A/C clutch.
- Does the A/C clutch engage and disengage as the jumper is disconnected and reconnected?
Yes -- For No A/C symptom: Remove jumper. Go to X63. X63 - Check ECT and TP Inputs
For No Wide Open Throttle A/C Cut-Off (WAC) symptom: Replace PCM. Remove breakout box. Reconnect all components. Re-evaluate symptom.
No -- Replace CCRM. Inspect the A/C clutch circuit for possible shorts to GND. Service as necessary. Remove breakout box. Reconnect all components. Re-evaluate symptom.
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.