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.
1983 Isuzu Impulse AutomaticFACTORY OEM SERVICE PROCEDURE
Test 2: O2 Sensor (Codes 13, 44 And 45)
- Disconnect MCU control terminals at MCU. Disconnect oxygen sensor at connector. Check for continuity and grounds between terminal 30 and oxygen sensor connector. If circuits are good, go to step 2
.CAUTION: A voltmeter with internal resistance of at least 20,000 ohms must be used to check the oxygen sensor. Damage to the oxygen sensor may result if any other test meter is used.
- Connect a test wire to the oxygen sensor terminal, and reconnect sensor terminal to I-TEC wiring. Connect the positive lead of the tester to the test wire and the negative lead to ground. Start engine, and check for voltage variations between 0 and .8 volts when engine speed is momentarily increased. Replace oxygen sensor if no voltage variation is noted.
Factory Service Tools
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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.