Throttle Position Sensor: Testing and Inspection
Throttle Position Sensor Signal InspectionNOTE:
- This procedure checks the APP sensor in its fully closed position. In any other position, the APP sensor stores DTCs which are covered in other troubleshooting procedures.
- Check for Temporary DTCs or DTCs with the HDS before doing this procedure. If any DTCs are indicated, troubleshoot them first, then do this procedure.
- Press the accelerator pedal several times to check its movement. If it does not move smoothly, check the pedal, the throttle cable, and the throttle linkage individually. If you find a problem in one of them, replace the part(s) that caused the problem.
1. Connect the HDS or an OBD II scan tool to the data link connector (DLC) (A). On 2000-2001 models, the DLC is under the passenger's side of the dashboard. On 2002-2005 models, the DLC is behind the driver's side of the front console.
2. Turn the ignition switch ON (II).
3. Make sure the accelerator pedal is not pressed, then check the TP SENSOR in the DATA LIST with the HDS.
- If it is below 0.5 V, the throttle position sensor is OK.
- If it is above 0.5 V, adjust the throttle cable, then go to step 4.
4. Make sure the accelerator pedal is not pressed, then check the TP SENSOR in the DATA LIST with the HDS.
- If it is below 0.5 V, the throttle position sensor is OK.
- If it is above 0.5 V, substitute a known-good ECM, then go to step 5.
5. Make sure the accelerator pedal is not pressed, then check the TP SENSOR in the DATA LIST with the HDS.
- If it is below 0.5 V, the throttle position sensor is OK.
- If it is above 0.5 V, replace the throttle body, then go to step 1.