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Acura RL. Manual - part 751

3. Check for DTCs in the VSA system with the HDS.

Are any VSA System DTCs indicated?

YES - Go to the indicated DTCs troubleshooting.

NO - Go to step 4.

4. Place the vehicle on a flat surface and compare the lateral G sensor and the lateral G sensor neutral

position data in the DATA LIST with the HDS.

Is there difference between those two within 0.2 V?

YES - Replace the yaw rate-lateral/longitudinal acceleration sensor (see YAW RATE-
LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT ).

NO - Do the yaw rate-lateral/longitudinal acceleration neutral position memorization (see YAW
RATE-LATERAL/LONGITUDINAL ACCELERATION NEUTRAL POSITION
MEMORIZATION ).

DTC 14-1,14-2: LATERAL/LONGITUDINAL ACCELERATION SENSOR NEUTRAL POSITION

1. Turn the ignition switch ON (II).

2. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it doesn't,

troubleshoot the DLC circuit; '05-07 models (see '05-07 MODELS ), '08 model (see '08 MODEL ).

3. Clear the DTC with the HDS.

4. Start the engine.

5. Check for DTCs with the HDS.

Is DTC 14-1 and/or 14-2 indicated?

YES - Go to step 6.

NO - Intermittent failure, the system is OK at this time.

6. Place the vehicle on a flat surface.

7. Check the lateral/longitudinal acceleration sensor A/D value in the DATA LIST with the HDS.

Is there about 2.2-2.8 V?

YES - Go to step 8.

NO - Check the yaw rate-lateral/longitudinal acceleration sensor installation (see YAW RATE-
LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT ).

NOTE:

Before you troubleshoot, review the general troubleshooting information
(see GENERAL TROUBLESHOOTING INFORMATION ).

2007 Acura RL

2005-08 DRIVELINE/AXLES Rear Differential - RL

Friday, June 05, 2009 3:02:18 PM

Page 31

8. Check for yaw rate-lateral/longitudinal acceleration neutral position memorization with the HDS.

Is the value "OK"?

YES - Replace the SH-AWD control unit (see SH-AWD CONTROL UNIT REPLACEMENT ).

NO - Do the yaw rate-lateral/longitudinal acceleration neutral position memorization (see YAW
RATE-LATERAL/LONGITUDINAL ACCELERATION NEUTRAL POSITION
MEMORIZATION ).

DTC 16-1: STEERING ANGLE SENSOR SIGNAL

1. Turn the ignition switch ON (II).

2. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it doesn't,

troubleshoot the DLC circuit; '05-07 models (see '05-07 MODELS ), '08 model (see '08 MODEL ).

3. Check the steering angle sensor in the DATA LIST with the HDS.

When the steering wheel is turned slowly, does the value change?

YES - Intermittent failure, the system is OK at this time.

NO - Go to step 4.

4. Turn the ignition switch OFF.

5. Disconnect SH-AWD control unit connector A (26P).

6. Turn the ignition switch ON (II). Measure the voltage between SH-AWD control unit connector

terminals A12 and A22.

Fig. 29: Measuring Voltage Between SH-AWD Control Unit Connector Terminals A12 And A22
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the voltage change from about 1.5 V to 4.0 V when the steering wheel is turned slowly?

YES - Go to step 7.

NOTE:

Before you troubleshoot, review the general troubleshooting information
(see GENERAL TROUBLESHOOTING INFORMATION ).

2007 Acura RL

2005-08 DRIVELINE/AXLES Rear Differential - RL

Friday, June 05, 2009 3:02:18 PM

Page 32

NO - Go to step 8.

7. Measure the voltage between SH-AWD control unit connector terminals A12 and A21.

Fig. 30: Measuring Voltage Between SH-AWD Control Unit Connector Terminals A12 And A21
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the voltage change from about 1.5 V to 4.0 V when the steering wheel is turned slowly?

YES - Replace the SH-AWD control unit (see SH-AWD CONTROL UNIT REPLACEMENT ).

NO - Go to step 11.

8. Turn the ignition switch OFF.

9. Disconnect the steering angle sensor 5P connector.

10. Check for continuity between SH-AWD control unit connector terminal A22 and steering angle

sensor 5P connector terminal No. 2.

Fig. 31: Checking Continuity Between SH-AWD Control Unit Connector Terminal A22 And
Steering Angle Sensor 5P Connector Terminal No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Check for DTCs in the VSA system. If there are VSA system DTCs, go to the indicated DTCs
troubleshooting. If no DTCs are indicated, intermittent failure, the system is OK at this time. Check
for loose connector terminals at the SH-AWD control unit and repair if necessary.

2007 Acura RL

2005-08 DRIVELINE/AXLES Rear Differential - RL

Friday, June 05, 2009 3:02:18 PM

Page 33

NO - Repair open in the wire between SH-AWD control unit connector A and the steering angle
sensor connector.

11. Turn the ignition switch OFF.

12. Disconnect the steering angle sensor 5P connector.

13. Check for continuity between SH-AWD control unit connector terminal A21 and steering angle

sensor 5P connector terminal No. 4.

Fig. 32: Checking Continuity Between SH-AWD Control Unit Connector Terminal A21 And
Steering Angle Sensor 5P Connector Terminal No. 4
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

NO - Repair open in the wire between SH-AWD control unit connector A and the steering angle
sensor connector.

DTC 19-1: STEERING ANGLE SENSOR (OPEN)

1. Turn the ignition switch ON (II).

2. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it doesn't,

troubleshoot the DLC circuit; '05-07 models (see '05-07 MODELS ), '08 model (see '08 MODEL ).

3. Clear the DTC with the HDS.

4. Start the engine.

5. Check for DTCs with the HDS.

Is DTC 19-1 indicated?

YES - Go to step 6.

NOTE:

Before you troubleshoot, review the general troubleshooting information
(see GENERAL TROUBLESHOOTING INFORMATION ).

2007 Acura RL

2005-08 DRIVELINE/AXLES Rear Differential - RL

Friday, June 05, 2009 3:02:18 PM

Page 34

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