Electronic Throttle Control System: Diagnosis Acura TL IV facelift

APP 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 Pending or Confirmed 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 operation. If it does not operate smoothly, check the pedal. If you find a problem, replace the accelerator pedal module (see Accelerator Pedal Module Removal and Installation ).

Scheme 83

1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Make sure the HDS communicates with the ECM/PCM. If it doesn't, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(ref-512332-S41833507042012103100000) ).
4. Make sure the accelerator pedal is not pressed, then check the APP SENSOR in the DATA LIST with the HDS. If it is 0 %, the APP sensor is OK. If it is not 0 %, update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(ref-512332-S15795428962012103100000) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(ref-512356-S00793962012012103100000) ), then go to step 5.
5. Make sure the accelerator pedal is not pressed, then check the APP SENSOR in the DATA LIST with the HDS. If it is 0 %, the APP sensor is OK. If it is not 0 %, replace the accelerator pedal module (see «Accelerator Pedal Module Removal and Installation»(ref-512376-S40103857992012103100000) ), then go to step 1 .

Scheme 84

1. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(ref-512381-S11938601542012103100000) ).
2. Disconnect the APP sensor 6P connector (A).
3. Remove the two mounting nuts (B), then remove the clip (C). Using a flat-tip screwdriver (D), push the lock (E), then remove the accelerator pedal pad (F) from the pedal stop (G).
4. Remove the accelerator pedal module.

Note. The APP sensor is not available separately. Do not disassemble the accelerator pedal module. If the pedal stop is damaged, replace it by pulling back the carpet (A), and removing the nuts (B), the bolt (C), and the pedal stop (D).

Scheme 85

Scheme 86

Scheme 87

1. Install the accelerator pedal pad (A) to the pedal stop (B). Slide the pad until it locks with a clicking sound.
2. Install a new clip (A). NOTE: The clip must be replaced whenever the accelerator pedal module is installed. Make sure that the accelerator pedal module and the clip are secure.
3. Install the nuts (B), and connect the APP sensor 6P connector (C).