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 SENSORSERVICE AND REPAIR
1993 Geo Prizm L4-1600cc 1.6L DOHC
Throttle Position Sensor: Service and Repair
1993 Geo Prizm L4-1600cc 1.6L DOHCSECTION Service and Repair
Remove or Disconnect
1. Negative (-) battery cable.
2. TP sensor electrical connector.
3. Two screws and TP sensor from throttle body.
Install or Connect
Tool Required: J39200 Digital Multimeter
1. TP sensor to throttle body; secure with two screws (Do not tighten fully).
ADJUST
Insert a feeler gage between the throttle stop screw and the throttle lever. On vehicles equipped with California Emissions, also disconnect the throttle opener vacuum hose from the throttle body and apply vacuum to it.
^ Using a J39200, check for continuity between the terminals of the TP sensor according to the chart in the accompanying illustration.
^ Rotate the TP sensor if necessary to adjust.
Tighten
^ TP sensor attaching screws.
^ Recheck continuity according to chart in the accompanying illustration.
2. TP sensor electrical connector and throttle opener vacuum hose to throttle body on vehicles equipped with California Emissions.
3. Negative (-) battery cable.
Tighten
^ Negative battery cable-to-negative (-) battery terminal retainer to 15 Nm (11 lb.ft.).
NOTICE: If vehicle is equipped with California Emissions, perform throttle opener adjustment below.
Adjust
^ Start and run engine until normal operating temperature is attained.
^ Connect a tachometer to the battery and also to data link connector (DLC) terminal IG-.
^ Disconnect throttle opener vacuum hose at throttle opener and plug the hose end.
^ Maintain engine speed at approximately 25OO rpm.
^ Release the throttle lever and make sure that the throttle opener is set and the engine speed is 1,300 - 1,500 rpm with the radiator fan motor OFF. Replace the throttle opener if it does not set.
^ Adjust throttle opener setting speed by turning the adjusting screw clockwise to increase engine speed and counterclockwise to decrease engine speed.
^ Reconnect vacuum hose to throttle opener and disconnect tachometer.
1. Negative (-) battery cable.
Throttle Position Sensor:
2. TP sensor electrical connector.
3. Two screws and TP sensor from throttle body.
Install or Connect
Tool Required: J39200 Digital Multimeter
1. TP sensor to throttle body; secure with two screws (Do not tighten fully).
Feeler Gage Installation:
ADJUST
Insert a feeler gage between the throttle stop screw and the throttle lever. On vehicles equipped with California Emissions, also disconnect the throttle opener vacuum hose from the throttle body and apply vacuum to it.
Measuring Throttle Position Sensor:
TP Sensor Resistance Specifications:
^ Using a J39200, check for continuity between the terminals of the TP sensor according to the chart in the accompanying illustration.
^ Rotate the TP sensor if necessary to adjust.
Tighten
^ TP sensor attaching screws.
TP Sensor Resistance Specifications:
^ Recheck continuity according to chart in the accompanying illustration.
2. TP sensor electrical connector and throttle opener vacuum hose to throttle body on vehicles equipped with California Emissions.
3. Negative (-) battery cable.
Tighten
^ Negative battery cable-to-negative (-) battery terminal retainer to 15 Nm (11 lb.ft.).
NOTICE: If vehicle is equipped with California Emissions, perform throttle opener adjustment below.
Adjust
^ Start and run engine until normal operating temperature is attained.
Install Tachometer:
^ Connect a tachometer to the battery and also to data link connector (DLC) terminal IG-.
Disconnecting Throttle Opener Vacuum Hose:
^ Disconnect throttle opener vacuum hose at throttle opener and plug the hose end.
^ Maintain engine speed at approximately 25OO rpm.
^ Release the throttle lever and make sure that the throttle opener is set and the engine speed is 1,300 - 1,500 rpm with the radiator fan motor OFF. Replace the throttle opener if it does not set.
^ Adjust throttle opener setting speed by turning the adjusting screw clockwise to increase engine speed and counterclockwise to decrease engine speed.
Adjusting Throttle Opener:
^ Reconnect vacuum hose to throttle opener and disconnect tachometer.
RENDER: 1.0x
NO RELATED
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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.