Throttle Position Sensor

This procedure covers the removal and replacement of the throttle position sensor (TPS) on the 5.3L V8 EcoTec3 L83 engine, including electrical disconnection and proper torque specifications.

Warnings

Tools required

Parts

• Throttle position sensor × 1 — AC Delco 213-4222 or equivalent
• TPS mounting screws (if corroded) × 2 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn ignition off and remove key from vehicle
3. Open hood and secure with prop rod
4. Disconnect negative battery cable and wait 2 minutes for system discharge
5. Locate throttle body assembly on driver side of engine (top front)

Procedure

1. 1

   Access throttle body area
   Remove engine cover if equipped by pulling upward on cover. The cover is held by integrated grommets on posts. Set aside in clean area. Identify the throttle body assembly located at the front of the intake manifold.
2. 2

   Disconnect throttle position sensor connector
   Locate the TPS electrical connector on the side of the throttle body. Press down on the locking tab while pulling the connector straight away from the sensor. Do not twist or rock the connector excessively. Inspect connector terminals for corrosion or damage.
3. 3

   Remove TPS mounting screws
   Using a 10mm socket or appropriate Torx driver, remove the two TPS mounting screws. The screws are located on the throttle body housing where the sensor mounts. Keep screws organized for reinstallation. Note the orientation of the sensor before removal.
   Torque spec

   TPS Screws3 Nm (2 lb-ft)
4. 4

   Remove throttle position sensor
   Carefully pull the TPS straight out from the throttle body shaft. The sensor slides off the throttle shaft and may require slight wiggling. Do not pry against the throttle body housing as damage to the sealing surface can occur. Inspect the mounting area for debris or damage.
5. 5

   Clean mounting surface
   Using shop towels, clean the TPS mounting surface on the throttle body. Remove any dirt, oil residue, or debris. If available, use electrical contact cleaner on the connector pins of the throttle body. Inspect the throttle shaft for smooth rotation and no excessive play.
6. 6

   Install new throttle position sensor
   Align the new TPS with the throttle shaft, ensuring the sensor tab aligns with the slot in the shaft. The sensor will only fit in one orientation. Push the sensor firmly onto the throttle body until it seats flush against the mounting surface. Verify proper alignment before installing screws.
7. 7

   Install and torque TPS screws
   Insert both TPS mounting screws and hand-thread them to prevent cross-threading. Using a torque wrench, tighten screws to specification in a cross pattern (alternating between screws). Final torque is 3.0 Nm (2.0 lb-ft). Do not overtighten as this can crack the sensor housing.
   Torque spec

   TPS Screws3 Nm (2 lb-ft)
8. 8

   Reconnect electrical connector
   Push the electrical connector onto the TPS until you hear/feel a positive click indicating the locking tab has engaged. Gently tug on the connector to verify it is locked in place. Ensure the connector is fully seated with no gap between connector and sensor.
9. 9

   Reinstall engine cover
   If engine cover was removed, align the cover grommets with the mounting posts on the engine. Press down firmly on each mounting point until all grommets are fully seated and the cover sits flat.
10. 10

    Reconnect battery and clear codes
    Reconnect the negative battery cable. Turn the ignition to ON position without starting the engine. Cycle the key on and off three times to allow the PCM to relearn the TPS position. The vehicle may need to idle for 2-3 minutes on first start to complete relearn procedure.

Reassembly

1. Ensure all electrical connections are secure and properly locked
2. Verify engine cover is properly seated on all mounting posts
3. Double-check that no tools or parts were left in engine compartment

Verification

• Start engine and verify it idles smoothly without hunting or stalling
• Confirm no check engine light illuminates after startup
• Test throttle response by gently pressing accelerator pedal - response should be smooth and immediate
• Use scan tool to verify TPS voltage reading changes smoothly from idle (typically 0.5-1.0V) to wide open throttle (typically 4.5-5.0V)
• Perform test drive to confirm normal acceleration and no hesitation during throttle input
• Re-check for diagnostic trouble codes after test drive

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