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 MANUALSGEO1993PRIZM L4-1600CC 1.6L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORADJUSTMENTSCALIFORNIA
1993 Geo Prizm L4-1600cc 1.6L DOHC
California
1993 Geo Prizm L4-1600cc 1.6L DOHCSECTION California
1. Remove negative battery cable.
2. Disconnect throttle position sensor (TPS) electrical connector.
3. Loosen TPS attaching screws.
4. Insert feeler gage between throttle stop screw and throttle lever.
5. Also disconnect throttle opener vacuum hose and apply vacuum to throttle opener (California emissions).
6. Using an ohmmeter, check for continuity between the terminals of the TPS according to specification in images above.
7. Rotate the TPS if necessary to adjust.
8. Tighten the TPS mounting screws.
9. Recheck the TPS continuity.
10. Reconnect TPS electrical connector.
11. Reconnect throttle opener vacuum hose and apply vacuum to throttle opener (California emissions).
NOTE: On vehicle with California Emissions perform the throttle opener adjustment below.
1. Start engine and run until normal operating temperature is attained.
2. Connect a tachometer between battery negative and DTC connector "IG-".
3. Disconnect throttle opener hose and plug.
4. Raise engine speed to 2500 rpm and hold.
5. Release the throttle lever and make sure that the throttle opener is set and the engine speed is 1300 to 1500 rpm while the radiator fan motor is off. Replace the throttle opener if the throttle opener is not set.
6. Adjust throttle opener setting by turning the adjusting screw clockwise to increase engine speed and counterclockwise to decrease engine speed.
7. Reconnect vacuum hose to throttle opener and disconnect tachometer.
TP Sensor:
2. Disconnect throttle position sensor (TPS) electrical connector.
3. Loosen TPS attaching screws.
Feeler Gauge Installation:
4. Insert feeler gage between throttle stop screw and throttle lever.
Throttle Opener:
5. Also disconnect throttle opener vacuum hose and apply vacuum to throttle opener (California emissions).
TP Sensor Adjustment:
TP Sensor Resistance Specifications:
TP Sensor Resistance Specifications:
6. Using an ohmmeter, check for continuity between the terminals of the TPS according to specification in images above.
7. Rotate the TPS if necessary to adjust.
8. Tighten the TPS mounting screws.
9. Recheck the TPS continuity.
10. Reconnect TPS electrical connector.
11. Reconnect throttle opener vacuum hose and apply vacuum to throttle opener (California emissions).
NOTE: On vehicle with California Emissions perform the throttle opener adjustment below.
1. Start engine and run until normal operating temperature is attained.
Tachometer Installation:
2. Connect a tachometer between battery negative and DTC connector "IG-".
Throttle Opener:
3. Disconnect throttle opener hose and plug.
4. Raise engine speed to 2500 rpm and hold.
5. Release the throttle lever and make sure that the throttle opener is set and the engine speed is 1300 to 1500 rpm while the radiator fan motor is off. Replace the throttle opener if the throttle opener is not set.
Throttle Opener Adjustment:
6. Adjust throttle opener setting by turning the adjusting screw clockwise to increase engine speed and counterclockwise to decrease engine speed.
7. Reconnect vacuum hose to throttle opener and disconnect tachometer.
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.