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 SYSTEMSMAIN RELAY (COMPUTER/FUEL SYSTEM)TESTING AND INSPECTION
1991 Daihatsu Charade L4-1295cc 1.3L
Main Relay (Computer/Fuel System): Testing and Inspection
1991 Daihatsu Charade L4-1295cc 1.3LSECTION Testing and Inspection
Fig. 5 Main Relay Pin Locations.:
Fig. 6 Main Relay Pin Location.:
1. Measure resistance between terminals 1 and 2, Figs. 5 and 6. Resistance should be 40-100 ohms.
2. Ensure continuity does not exists between terminals 3 and 4, 1 and 3, 1 and 4, 2 and 3 or between terminals 2 and 4.
3. Supply battery power to terminals 1 and 2.
4. Ensure continuity exists between terminals 3 and 4.
5. If any test fails, replace main relay.
6. Perform main relay circuit test.
Fig. 54 ECU System Diagnosis, Main Relay Check (Part 1 Of 3):
Fig. 54 ECU System Diagnosis, Main Relay Check (Part 2 Of 3):
Fig. 54 ECU System Diagnosis, Main Relay Check (Part 3 Of 3):
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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.