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 MANUALSCHEVROLET1993ASTRO VAN PASSENGER EXTENDED, 4.3 ZREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSENGINE SENSORS & SWITCHESTHROTTLE POSITION (TP) SENSOR
1993 Chevrolet Astro Van Passenger Extended, 4.3 Z
Throttle Position (TP) Sensor
1993 Chevrolet Astro Van Passenger Extended, 4.3 ZSECTION Throttle Position (TP) Sensor
- Install jumper wires to enable connection of a DVOM in parallel between TP sensor harness connectors. Connect DVOM positive lead to Dark Blue wire terminal. Connect negative lead to Black wire terminal. See Fig 1.
- Turn ignition on, engine off. Signal voltage should gradually change from less than one volt at closed throttle to about 5.0 volts at wide open throttle position. If reading is not as specified, replace TP sensor.
- TP sensor circuit malfunction should set a related trouble code. For further information, see appropriate TESTS W/CODES article in this section. Also see TPS ADJUSTMENT in ADJUSTMENTS article in this section.
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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.