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.
2000 Pontiac Firefly (CANADA) L4-1.3LFACTORY OEM SERVICE PROCEDURE
Transmission Position Sensor/Switch: Service and Repair
Removal Procedure
Caution: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Remove the PNP switch electrical connector at the engine wiring harness.
3. Remove the PNP switch harness from the retaining clamps.
4. Remove 1 bolt and the PNP switch (4) from the transaxle.
Installation Procedure
1. Move the transaxle lever (1) to the N position.
2. Adjust the PNP switch (1) by using a standard flat-bladed screwdriver. Turn the PNP switch clockwise or counterclockwise until you hear 2 clicks.
Notice: Refer to Fastener Notice in Service Precautions.
3. Install the PNP switch (4) to the transaxle. Install the bolt (1) in order to retain the switch.
Tighten the PNP switch mounting bolt to 23 Nm (17 ft. lbs.).
4. Connect the PNP switch electrical connector at the engine wiring harness.
5. Install the PNP switch harness into the retaining clamps.
6. Connect the negative battery cable
7. Upon completion of the PNP switch installation, perform the following steps in order to ensure proper operation:
- Apply the parking brake, and block the vehicle wheels.
- With the manual selector lever (5) in the P position, turn the ignition switch to the START position. Verify that the starter motor operates.
- Stop the engine, and return the ignition switch to the ON position.
- Move the shift selector lever (5) from the P position to the N position. Turn the ignition switch to the START position, and verify that the starter motor operates.
- Verify that the starter motor does not operate in D, 2, L, or R
Caution: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Remove the PNP switch electrical connector at the engine wiring harness.
3. Remove the PNP switch harness from the retaining clamps.
4. Remove 1 bolt and the PNP switch (4) from the transaxle.
Installation Procedure
1. Move the transaxle lever (1) to the N position.
2. Adjust the PNP switch (1) by using a standard flat-bladed screwdriver. Turn the PNP switch clockwise or counterclockwise until you hear 2 clicks.
Notice: Refer to Fastener Notice in Service Precautions.
3. Install the PNP switch (4) to the transaxle. Install the bolt (1) in order to retain the switch.
Tighten the PNP switch mounting bolt to 23 Nm (17 ft. lbs.).
4. Connect the PNP switch electrical connector at the engine wiring harness.
5. Install the PNP switch harness into the retaining clamps.
6. Connect the negative battery cable
7. Upon completion of the PNP switch installation, perform the following steps in order to ensure proper operation:
- Apply the parking brake, and block the vehicle wheels.
- With the manual selector lever (5) in the P position, turn the ignition switch to the START position. Verify that the starter motor operates.
- Stop the engine, and return the ignition switch to the ON position.
- Move the shift selector lever (5) from the P position to the N position. Turn the ignition switch to the START position, and verify that the starter motor operates.
- Verify that the starter motor does not operate in D, 2, L, or R
Factory Service Tools
Use the Manual With the Right Hardware
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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.