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 PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTS - PFIIDLE CONTROL SYSTEMIDLE SPEED CONTROL (ISC) MOTOR OPERATION TEST
1990 Mitsubishi Precis Base, Standard
Idle Speed Control (ISC) Motor Operation Test
1990 Mitsubishi Precis Base, StandardSECTION Idle Speed Control (ISC) Motor Operation Test
CAUTION:
DO NOT
apply more than 6 volts to ISC motor.
Connect 6-volt DC source across terminals No. 1 and 2 of ISC motor connector. See Fig 1 . Reverse polarity of 6-volt source by reversing leads. If motor does not operate in both directions, replace ISC motor assembly.
RENDER: 1.0x
NO RELATED
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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.