Throttle Position Sensor Signal Inspection
NOTE:
- 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.
- 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.
- Turn the ignition switch ON (II).
- 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 (see THROTTLE CABLE ADJUSTMENT ), then go to step 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 (see HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES ), then go to step 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 (see THROTTLE BODY REMOVAL/INSTALLATION ), then go to step 1.