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.
2002 Mercury Villager BaseFACTORY OEM SERVICE PROCEDURE
How To Use System Tests
NOTE:
For PCM connector terminal identification, see Figure.
- DO NOT perform any system test unless instructed by QUICK TEST or another SYSTEM TEST. Follow each test step in order until fault is found. DO NOT replace any part unless directed to do so. When more than one code is retrieved, start with first code displayed.
- Circuit tests ensure electrical circuits are okay before sensors or other components are replaced. Always test circuits for continuity between sensor and PCM. Test all circuits for short to power, opens or short to ground. Voltage Reference (VREF) and Voltage Power (VPWR) circuits should be tested with ignition on or as specified in tests.
- DO NOT make voltage or resistance measurement by probing PCM connector, as harness and connector are easily damaged. DO NOT connect any test light unless specified in testing procedure. All measurements are made by probing rear of connector (wiring harness side) unless instructed otherwise. Isolate both ends of a circuit and turn ignition off when checking for shorts or continuity, unless instructed otherwise.
- Disconnect solenoids and switches from harness before measuring continuity and resistance or applying voltage. After each repair, check all component connections and repeat QUICK TEST .
- An open is defined as a resistance reading of 5 ohms or more. However, this specification may be too high for some items. If resistance approaches 5 ohms, always clean suspect connector and coat it with protective dielectric silicone grease. A short is defined as a resistance reading of 10 k/ohms or less to ground, unless stated otherwise in test.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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