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 MANUALSCHEVROLET1990S10/T10 BLAZER 2WD V6-173 2.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORADJUSTMENTS
1990 Chevrolet S10/T10 Blazer 2WD V6-173 2.8L
Throttle Position Sensor: Adjustments
1990 Chevrolet S10/T10 Blazer 2WD V6-173 2.8LSECTION Adjustments
NOTE: This check should be performed only when throttle body or TPS has been replaced, or after the minimum air flow has been adjusted.
1. Connect a digital voltmeter from the TPS connector terminal B (dark blue wire) to terminal A (black wire). Jumpers for terminal access can be made using appropriate connectors. A Scan tool can also be used to read TPS output voltage.
2. With the ignition ON, engine stopped, TPS voltage should be between 0.42 and 0.54 volts.
3. If voltage is out of range, rotate the TPS until 0.48 +/- 0.06 volts are obtained.
4. If above voltage limitation cannot be obtained, replace TPS.
5. Remove the voltmeter and jumpers, reconnect the TPS connector to sensor.
1. Connect a digital voltmeter from the TPS connector terminal B (dark blue wire) to terminal A (black wire). Jumpers for terminal access can be made using appropriate connectors. A Scan tool can also be used to read TPS output voltage.
2. With the ignition ON, engine stopped, TPS voltage should be between 0.42 and 0.54 volts.
3. If voltage is out of range, rotate the TPS until 0.48 +/- 0.06 volts are obtained.
4. If above voltage limitation cannot be obtained, replace TPS.
5. Remove the voltmeter and jumpers, reconnect the TPS connector to sensor.
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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.