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.
1994 Mercury Villager LSFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Quick Test
- Additional System Functions
- Circuit Tests
- Notes
- How To Use Circuit Tests
- Trouble Code Reference
- Circuit Test CMP - Camshaft Position (CMP) Sensor
- Circuit Test DLC - Diagnostic Link Connector (DLC)
- Circuit Test ECT - Engine Coolant Temperature (ECT) Sensor
- Circuit Test EGRC - EGR Control (EGRC) Solenoid
- Circuit Test EGRT - EGR Temperature (EGRT) Sensor
- Circuit Test Ho2S - Heated Oxygen Sensor (Ho2S)
- Circuit Test IGNS - Ignition Signal (IGNS)
- Circuit Test INJL - Injector Leak (INJL)
- Circuit Test INJS - Injector Signal (INJS)
- Circuit Test KS - Knock Sensor (KS)
- Circuit Test MAF - Mass Airflow (MAF) Sensor
- Circuit Test PGC - Power & Ground Connections (PGC)
- Circuit Test TP - Throttle Position (TP) Sensor
- Circuit Test VPWR - Vehicle Power (VPWR)
- Circuit Test VREF - Reference Voltage (VREF)
- Circuit Test VSS - Vehicle Speed Sensor (VSS)
- Summary
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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