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 SYSTEMSOXYGEN SENSORTESTING AND INSPECTION
1991 Daihatsu Charade L4-1295cc 1.3L
Oxygen Sensor: Testing and Inspection
1991 Daihatsu Charade L4-1295cc 1.3LSECTION Testing and Inspection
Fig. 41 Check Connector Test Harness:
1. Check oxygen sensor as follows:
a. Raise engine temperature to operating temperature.
b. Disconnect oxygen sensor and connect a volt/ohmmeter to oxygen sensor terminals.
c. Raise engine speed. Ensure volt/ohmmeter reads .45 volts or more.
d. If reading is less than .45 volts, replace oxygen sensor.
2. Inspect oxygen system as follows:
a. Connect check connector test harness.
b. With engine at operating temperature, connect brown terminal to black terminal on check connector test harness.
c. Hold engine speed at 3000 RPM for two minutes.
d. Measure voltage between green terminal and body ground, Fig. 41.
e. If voltage does not change eight times or more in ten seconds and no diagnosis codes are present, replace oxygen sensor.
3. Perform Oxygen Sensor circuit test.
Fig. 68 ECU System Diagnosis, Oxygen Sensor Check:
RENDER: 1.0x
NO RELATED
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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.