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 OPERATIONCOMPUTERIZED ENGINE CONTROLS (CEC)
1991 Mitsubishi Precis L4-1468cc 1.5L SOHC
Computerized Engine Controls (CEC)
1991 Mitsubishi Precis L4-1468cc 1.5L SOHCSECTION Computerized Engine Controls (CEC)
Instrument Cluster Component Locations:
The Check Engine light, located in the instrument panel, will come on to warn the driver if a malfunction occurs in the following circuits:
- Computer
- Oxygen sensor
- Air-flow sensor
- Intake air temperature sensor
- Throttle position sensor
Immediately after the ignition switch is turned on, the Check Engine light will light for 2.5 seconds to indicate that the light operates normally. When an irregular signal returns to normal the Check Engine light goes out. Also, when the ignition switch is turned off, the light goes out. If the engine is re-started the light will not come back on until the fault re-occurs, but a code will be stored in the ECU memory.
For further information on diagnosing and repairing the computerized engine controls, refer to COMPUTERIZED ENGINE CONTROLS.
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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.