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 MANUALSMITSUBISHI1990PRECIS BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - PFICOMPUTERIZED ENGINE CONTROLSCONTROL UNITGROUND CIRCUITS
1990 Mitsubishi Precis Base, Standard
Ground Circuits
1990 Mitsubishi Precis Base, StandardSECTION Ground Circuits
- Turn ignition off. Using an ohmmeter, check for continuity between ground and ECU terminals No. 5 and 10. Resistance should be zero ohms. If resistance is not zero ohms, repair open circuit between ECU connector and ground.
- Connect voltmeter negative lead to ground. Connect positive lead to ECU ground terminals as in step 1). With vehicle running, voltmeter should indicate less than 1 volt. If voltmeter reading is greater than 1 volt, check for open, corrosion or loose connection in ground circuit.
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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.