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.
Test I
1996 Buick Roadmaster BaseSECTION Test I
- When AIR pump is enabled, PCM monitors HO2S voltage. If HO2S voltages drop below a threshold, PCM interprets this as an indication that pump is operational.
- When AIR pump is disabled, PCM monitors HO2S voltages. HO2S voltages should increase above a threshold and switch normally. If PCM did not sense more than a predetermined amount of HO2S rich switches, a malfunction will be reported.
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.