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 MANUALSCHEVROLET1990BLAZER FULL SIZE V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTRANSMISSION POSITION SENSOR/SWITCHDESCRIPTION AND OPERATION
1990 Chevrolet Blazer Full Size V8-350 5.7L
Transmission Position Sensor/Switch: Description and Operation
1990 Chevrolet Blazer Full Size V8-350 5.7LSECTION Description and Operation
The park/neutral switch indicates to the ECM when the transmission is in park or neutral. This information is used by the ECM for ignition timing, IAC operation and transmission Torque Converter Clutch (TCC) operation. Do not drive vehicle with park/neutral switch disconnected, as idle quality may be affected.
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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.