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 Description
2001 Chevrolet Cavalier LS, 2.4 TSECTION Test Description
WARNING: This page is about a different car, the 2002 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers in the diagnostic procedures.
- 3
If DTCs P0412 or P0418 are set, diagnose those DTCs first. See DTC P0412: AIR RELAY CONTROL CIRCUIT or DTC P0418: AIR PUMP RELAY CONTROL CIRCUIT . - 4
Inspects for excess resistance in all of the circuits that are associated with the AIR system. - 5
This step tests for the battery voltage at the AIR pump relay. - 6
This step tests for power to the AIR pump. - 7
This step tests the ground circuit for the AIR pump. - 12
This step tests for a grounded circuit between the AIR pump and the AIR pump relay. - 22
A restriction in a hose or in a pipe, between the shut-off valve and the point where the system branches to each bank, causes the setting of this DTC. Inspect for kinks or for blockages from the AIR pump to the connection point where the AIR system divides.
RENDER: 1.0x
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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.