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 MANUALSDAIHATSU1991CHARADE L4-1295CC 1.3LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATION
1991 Daihatsu Charade L4-1295cc 1.3L
Computers and Control Systems: Description and Operation
1991 Daihatsu Charade L4-1295cc 1.3LSECTION Description and Operation
Fig. 4 ECU System Diagram.:
The Electronic Control Unit (ECU) controls the EFI system based on signals inputted from the various sensors. The Electronic Fuel Injection (EFI) system consists of three sub-systems: fuel, intake and control systems.
Besides this function, the ECU controls various functions such as fuel pump control, idle speed (ISC) vacuum switch valve (VSV) control, exhaust gas recirculation (EGR) VSV control, spark advance (SA) VSV control, barometric vacuum switch valve (PVSV) control, self-diagnosis function and fail-safe function.
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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.