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 MANUALSCHEVROLET1985C 20 P/U 2WD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESPOSITIONSAIR CONTROL SWITCH (ON/OFF)
1985 Chevrolet C 20 P/U 2WD V8-350 5.7L
Air Control Switch (on/Off)
1985 Chevrolet C 20 P/U 2WD V8-350 5.7LSECTION Air Control Switch (on/Off)
Displays status of ECM signals to air cleaner divert and air switching solenoids. With air cleaner divert signal in off condition, air pump output should be routed to atmosphere. In the on position, air pump output should be routed to the air switching solenoid. When the air divert solenoid is on and the air switching solenoid is on, air should be delivered to the exhaust ports. When the divert solenoid is on and the switching solenoid is off, air should be delivered to the catalytic converter.
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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.