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.
2004 Chevrolet Optra (CANADA) L4-2.0LFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor: Service and Repair
Throttle Position Sensor Replacement (wo/Throttle Actuator Control)
Removal Procedure
Caution: Refer to Battery Disconnect Caution Battery Disconnect Caution.
1. Disconnect the negative battery cable.
2. Remove the air intake tube and resonator.
3. Disconnect the throttle position (TP) sensor connector.
4. Remove the TP sensor retaining bolts and the TP sensor.
Installation Procedure
1. With the throttle valve closed, position the TP sensor on the throttle shaft. Align the TP sensor with the bolt holes.
Notice: Refer to Fastener Notice Fastener Notice.
2. Install the TP sensor retaining bolts.
Tighten the throttle position sensor retaining bolts to 2 Nm (18 lb in).
3. Connect the TP sensor connector.
4. Install the air intake tube and resonator.
5. Connect the negative battery cable.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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