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.
1990 Mitsubishi Precis RS, AutomaticFACTORY OEM SERVICE PROCEDURE
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.
Factory Service Tools
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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.