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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSFORD1994F 150 2WD PICKUP L6-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSX - CONSTANT CONTROL RELAY MODULE (CCRM)X72 - CHECK VPWR CIRCUIT TO CCRM
1994 Ford F 150 2WD Pickup L6-300 4.9L
X72 - Check VPWR Circuit To CCRM
1994 Ford F 150 2WD Pickup L6-300 4.9LSECTION X72 - Check VPWR Circuit To CCRM
- Key "OFF".
- Constant Control Relay Module (CCRM) disconnected.
- Disconnect Powertrain Control Module (PCM) power relay.
EEC-IV Power Relay Connector:
- Measure resistance between Pin 13 at the CCRM vehicle harness connector and the VPWR circuit at the Powertrain Control Module (PCM) power relay vehicle harness connector.
- Is resistance less than 5.0 ohms?
Yes -- Reconnect PCM power relay. Go to X73. X73 - Check Continuity of Fuel Pump Circuit
No -- Service open in VPWR circuit between PCM power relay and CCRM. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.