Solstice 2006-2008, Sky 2007-2008

Throttle Position Sensor

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Operation



There are 2 individual Throttle Position (TP) sensors within the throttle body assembly. The TP sensors are used to determine the throttle plate angle. The TP sensors provide the engine control module (ECM) with a signal voltage proportional to throttle plate movement. The TP sensor 1 signal voltage at closed throttle is near the 5-volt reference and decreases as the throttle plate is opened. The TP sensor 2 signal voltage at closed throttle is near the low reference and increases as the throttle plate is opened.

Removal & Installation



2.0L (LNF) Engine

WARNING
Do not use solvent of any type when cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as damage to the gasket surfaces and throttle body assembly may result. Use care in cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as sharp tools may damage the gasket surfaces. Do not use any solvent that contains Methyl Ethyl Ketone Peroxide (MEKP). This solvent may damage fuel system components.

  1. Remove the charge air cooler outlet pipe.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the Electronic Throttle Control (ETC).
  4.  
  5. Disconnect the engine wiring harness electrical connector from the brake booster auxiliary pump.
  6.  
  7. Remove the brake booster auxiliary pump electrical connector clip from the bracket.
  8.  
  9. Remove the throttle body bolts.
  10.  
  11. Remove the throttle body and seal from the intake manifold.
  12.  

To install:

  1. Inspect the throttle body seal, and replace if necessary.
  2.  
  3. Position the throttle body to the intake manifold.
  4.  
  5. Install the throttle body bolts and tighten to 89 inch. lbs. (10 Nm).
  6.  
  7. Connect the engine wiring harness electrical connector to the brake booster auxiliary pump.
  8.  
  9. Install the brake booster auxiliary pump electrical connector clip to the bracket.
  10.  
  11. Connect the engine wiring harness electrical connector (1) to the ETC.
  12.  
  13. Install the charge air cooler outlet pipe.
  14.  

2.4L (LE5) Engine

WARNING
Do not use solvent of any type when cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as damage to the gasket surfaces and throttle body assembly may result. Use care in cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as sharp tools may damage the gasket surfaces. Do not use any solvent that contains Methyl Ethyl Ketone Peroxide (MEKP). This solvent may damage fuel system components.

  1. Remove the intake manifold cover.
  2.  
  3. Remove the air cleaner outlet.
  4.  
  5. Disconnect the Electronic Throttle Control (ETC) electrical connector.
  6.  
  7. Remove the throttle body bolts.
  8.  
  9. Remove the throttle body from the intake manifold.
  10.  

To install:

  1. Inspect the throttle body gasket and replace if necessary.
  2.  
  3. Position the throttle body to the intake manifold.
  4.  
  5. Install the throttle body bolts and tighten to 89 inch. lbs. (10 Nm).
  6.  
  7. Connect the ETC electrical connector.
  8.  
  9. Install the air cleaner outlet.
  10.  
  11. Install the intake manifold cover.
  12.  

Testing



  1. Ignition OFF, disconnect the harness connector at the throttle body.
  2.  
  3. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal no. C and ground.
    1. If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the Engine Control Module (ECM).
    2.  

  4.  
  5. Ignition ON, test for 4.8-5.2 volts between 5-volt reference circuit terminal no. E and ground.
    1. If less than 4.8 volts, test 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    2.  
    3. If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
    4.  

  6.  
  7. Verify the scan tool Throttle position (TP) sensor 1 voltage is less than 0.1 volt.
    1. If greater than 0.1 volt, test the signal circuit terminal no. D for a short to voltage. If the circuit tests normal, replace the ECM.
    2.  

  8.  
  9. Verify the scan tool TP sensor 2 voltage is greater than 4.8 volts.
    1. If less than 4.8 volts, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
    2.  

  10.  
  11. Install a 3A fused jumper wire between the signal circuit terminal no. D and the 5-volt reference circuit terminal no. E of the TP sensor 1. Verify the TP sensor 1 voltage is greater than 4.8 volts.
    1. If less than 4.8 volts, test the TP sensor 1 signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    2.  

  12.  
  13. Install a 3A fused jumper wire between the signal circuit terminal no. F and the low reference circuit terminal no. C of the TP sensor 2. Verify that the TP sensor 2 voltage is less than 0.1 volt
    1. If greater than 1.0 volt, test the TP sensor 2 signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
    2.  

  14.  
  15. Ignition OFF for 90 seconds, disconnect the harness connector at the ECM.
  16.  
  17. Test for less than 5 ohms of resistance on all TP sensor circuits between the following terminals:
    1. ECM C2 signal circuit terminal no. 65 to TP terminal no. D
    2.  
    3. ECM C2 signal circuit terminal no. 63 to TP terminal no. F
    4.  
    5. ECM C2 5-volt reference circuit terminal no. 3 to terminal no. E
    6.  

  18.  
  19. If greater than 5 ohms, repair the affected circuit for open/high resistance.
  20.  
  21. Test for infinite resistance between TP sensor 1 signal circuit terminal no. D and TP sensor signal circuit terminal no. F.
    1. If less than infinite resistance, repair the short between TP sensor 1 signal circuit and TP sensor 2 signal circuit.
    2.  

  22.  
  23. If all circuits test normal, replace the throttle body.

    Click image to see an enlarged view

    Fig. Electronic Throttle Control (ETC)

  24.  

Throttle Body Relearn Procedure




NOTE
Do NOT perform this procedure if DTCs are set.

  1. Start and idle the engine in PARK for 3 minutes.
  2.  
  3. With a scan tool, monitor desired and actual RPM.
  4.  
  5. The Engine Control Module (ECM) will start to learn the new idle cells and Desired RPM should start to decrease.
  6.  
  7. Ignition OFF for 60 seconds.
  8.  
  9. Start and idle the engine in PARK for 3 minutes.
  10.  
  11. After the 3 minute run time the engine should be idling normal.
    NOTE
    During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.



    If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 mph) with several decelerations and extended idles.
     

  12.  
  13. After the drive cycle, the engine should be idling normally.

    If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds and repeat step 6.
     

  14.  
  15. Once the engine speed has returned to normal, clear DTCs.
  16.  

 
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