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 MANUALSMITSUBISHI1991PRECIS L4-1468CC 1.5L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONGENERAL SYSTEM DESCRIPTION
1991 Mitsubishi Precis L4-1468cc 1.5L SOHC
General System Description
1991 Mitsubishi Precis L4-1468cc 1.5L SOHCSECTION General System Description
ECU System:
The computerized engine control system is designed to reduce emission levels and increase fuel economy to standards set by government agencies, while at the same time maximizing engine output. The ECU consists of an 8-bit microprocessor, random access memory (RAM), read only memory (ROM) and Input/Output (I/0) interface. The ECU actively controls the operation of the Fuel Injection system, the Ignition timing, and has full control of the Idle Speed Control system. The system is also able to store and retrieve malfunction information through it's self-diagnostic functions.
RENDER: 1.0x
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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.