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 MANUALSISUZU1990AMIGO S, 2.3 L, MSG5EREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EFISENSORSOXYGEN (O2) SENSOR TEST
1990 Isuzu Amigo S, 2.3 L, MSG5E
Oxygen (O2) Sensor Test
1990 Isuzu Amigo S, 2.3 L, MSG5ESECTION Oxygen (O2) Sensor Test
- Start engine and warm to operating temperature. Ensure vehicle is operating in closed loop. Unplug O[I2] sensor connector at sensor.
- Using Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, connect DVOM (on voltmeter scale) between ground and oxygen sensor connector (sensor side).
- Place a short jumper wire in sensor lead (computer side). While holding jumper wire in one hand, alternately touch negative battery terminal and then positive terminal with other hand. DO NOT TOUCH sensor lead directly to battery.
- Monitor DVOM reading. When negative battery terminal is touched, oxygen sensor output voltage should increase (up to one volt). When positive battery terminal is touched, oxygen sensor output voltage should drop (as low as .1 volt). If oxygen sensor does not respond as indicated, replace sensor.
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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.