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 MANUALSMITSUBISHI1990MONTERO SP, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 9 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS)COMPUTERIZED ENGINE CONTROLSCONTROL UNITGROUND CIRCUITS
1990 Mitsubishi Montero SP, Standard
Ground Circuits
1990 Mitsubishi Montero SP, StandardSECTION Ground Circuits
WARNING: This page is about a different car, the 1991 Mitsubishi Pickup, 1991 Mitsubishi Montero, and 1991 Dodge Ram 50. However, it is still accessible from the selected car via links, so may be relevant.
- ECU is located near right kick panel. Turn ignition off. Using an ohmmeter, check for continuity between ground and ECU terminals No. 101 and 106. 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 one volt. If voltmeter reading is greater than one 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.