Acura RL. Manual - part 461

module relay, the throttle actuator control module, and the PCM. If the PCM was updated, substitute a
known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go
to step 1.

NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the
original PCM (see PCM REPLACEMENT ). If any other Temporary DTCs or DTCs are indicated,
go to the indicated DTCs troubleshooting.

APP SENSOR SIGNAL INSPECTION

1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the

dashboard.

Fig. 85: Connecting HDS To Data Link Connector (DLC)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Turn the ignition switch ON (II).

3. Make sure the HDS communicates with the PCM and other vehicle systems. If it does not, go to the

DLC circuit troubleshooting (see DLC CIRCUIT TROUBLESHOOTING ).

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 PCM if it does not have the latest software, or substitute a known-
good PCM (see SUBSTITUTING THE PCM ), then go to step 5.

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 operation. If it
does not operate properly, check the pedal. If you find a problem,
replace the accelerator pedal module (see ACCELERATOR PEDAL
MODULE REMOVAL/INSTALLATION ).

2007 Acura RL

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

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Page 65

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/INSTALLATION ), then go to step 1.

ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION

1. Disconnect the APP sensor connector (A).

Fig. 86: Identifying APP Sensor Connector With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Release the lock tab on the base of the accelerator pedal, then remove the accelerator pedal module

(B).

3. Install the parts in the reverse order of removal.

THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT

1. Remove the right kick panel (see step 3 under TRIM REMOVAL/INSTALLATION - DOOR

AREAS ).

2. Remove the glove box (see GLOVE BOX REMOVAL/INSTALLATION ).

3. Remove the HandsFreeLink control unit (see CONTROL UNIT INPUT TEST ) and the adaptive

cruise control (ACC) unit and its bracket (if equipped) (see ADAPTIVE CRUISE CONTROL
(ACC) UNIT REMOVAL/INSTALLATION ).

4. Disconnect the throttle actuator control module 16P connector (A).

2007 Acura RL

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

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Page 66

Fig. 87: Identifying Throttle Actuator Control Module (With Adaptive Cruise Control ACC
System)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig. 88: Identifying Throttle Actuator Control Module (Without Adaptive Cruise Control ACC
System)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

5. Remove the nuts (B) and the throttle actuator control module (C).

6. Install the parts in the reverse order of removal.

2007 Acura RL

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

Friday, June 05, 2009 2:29:49 PM

Page 67

2005-08 ENGINE

Engine Block - RL

SPECIAL TOOLS

Fig. 1: Identifying Special Tools
Courtesy of AMERICAN HONDA MOTOR CO., INC.

COMPONENT LOCATION INDEX

2007 Acura RL

2005-08 ENGINE Engine Block - RL

2007 Acura RL

2005-08 ENGINE Engine Block - RL

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