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Acura RL. Manual - part 774

1. Test the battery (see BATTERY TEST ). Charge or replace the battery if necessary.

2. From the mode menu, select DATA LIST and check the COMPLETE MEMORIZATION with the

HDS.

Does the data list show "complete"?

YES - Go to step 3.

NO - Do the SH-AWD system memorization procedures for each of the following, then go to step 3.



Differential clutch torque (see SH-AWD DIFFERENTIAL CLUTCH TORQUE
MEMORIZATION )



Steering angle neutral position (see STEERING ANGLE NEUTRAL POSITION
MEMORIZATION )



Yaw rate-lateral/longitudinal acceleration (see YAW RATE-LATERAL/LONGITUDINAL
ACCELERATION NEUTRAL POSITION MEMORIZATION )



Control unit initialization (see SH-AWD CONTROL UNIT INITIALIZATION )

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

Are any steering angle sensor DTCs indicated?

YES - Go to the indicated DTCs troubleshooting.

NO - Go to step 4.

4. Start the engine.

5. Check the SH-AWD indicator value with the HDS.

Is the SH-AWD indicator value OFF?

YES - Go to the gauge control system DTC troubleshooting (see TROUBLESHOOTING - B-CAN
SYSTEM DIAGNOSIS TEST MODE A ).

NO - Update the SH-AWD control unit if it does not have the latest software (see UPDATING THE
SH-AWD CONTROL UNIT ), or substitute a known-good SH-AWD control unit (see SH-AWD
CONTROL UNIT REPLACEMENT ) and recheck. If the symptom/indication goes away with the
updated SH-AWD control unit, troubleshooting is complete. If the symptom/indication goes away
with a known-good SH-AWD control unit, replace the original SH-AWD control unit (see SH-AWD
CONTROL UNIT REPLACEMENT ).

THE SH-AWD INDICATOR DOES NOT COME ON



Make sure the charging system is OK.



Make sure the PGM-FI system and the A/T system is not in the middle
of updating.

NOTE:

Before you troubleshoot, review the general troubleshooting information

2007 Acura RL

2005-08 DRIVELINE/AXLES Rear Differential - RL

Friday, June 05, 2009 3:02:19 PM

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 SH-AWD indicator.

Does the SH-AWD indicator come on and go off?

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 connectors A (26P) and B (8P).

6. Turn the ignition switch ON (II).

7. Check the SH-AWD indicator.

Does the SH-AWD indicator come on?

YES - Update the SH-AWD control unit if it does not have the latest software (see UPDATING THE
SH-AWD CONTROL UNIT ), or substitute a known-good SH-AWD control unit (see SH-AWD
CONTROL UNIT REPLACEMENT ) and recheck. If the symptom/indication goes away with the
updated SH-AWD control unit, troubleshooting is complete. If the symptom/indication goes away
with a known-good SH-AWD control unit, replace the original SH-AWD control unit (see SH-AWD
CONTROL UNIT REPLACEMENT ).

NO - Go to the gauge control system DTC troubleshooting (see TROUBLESHOOTING - B-CAN
SYSTEM DIAGNOSIS TEST MODE A ).

SH-AWD FUNCTION TEST

Special Tools Required

Adapter, torque wrench 070AJ-SJAA101

DIRECT ELECTROMAGNETIC CLUTCH TEST

1. Check that the differential oil temperature is over 20°C (68°F) with the HDS. If it is below 20°C (68°

F), raise the temperature by driving the vehicle in circles or by constantly turning.

(see GENERAL TROUBLESHOOTING INFORMATION ).

NOTE:



No DTC was detected.



The shift lever is in N.



The SH-AWD control unit had been initialized.



The tire pressures are at the specified value.



Tire wear is the same between the left and right tires.

2007 Acura RL

2005-08 DRIVELINE/AXLES Rear Differential - RL

Friday, June 05, 2009 3:02:19 PM

2. Raise the vehicle, and make sure it is securely supported.

3. Remove the rear wheels.

4. Connect the HDS to the DLC.

5. Do the direct electromagnetic clutch test with the HDS.

6. Install the special tool on the rear wheel hub.

Fig. 160: Identifying Special Tool
Courtesy of AMERICAN HONDA MOTOR CO., INC.

7. Install a torque wrench on the special tool as shown on the HDS. Write down the torque value while

slowly rotating the rear hub with the torque wrench as shown. (Turn the hub no more than 90 degrees
in 7 to 10 seconds.)

Fig. 161: Installing Torque Wrench
Courtesy of AMERICAN HONDA MOTOR CO., INC.

8. Enter the torque value into the HDS, and wait for the test to finish.



If the result shows the clutch driving force is normal, the clutch assembly is OK.



If the result shows the clutch driving force is abnormal, replace the differential oil, and retest. If
the result still shows the clutch driving force is abnormal, replace the rear differential side case.

NOTE:

Use a torque wrench capable of measuring up to 50 kgf.m (360 lbf.ft)
such as a commercially available Snap-on torque wrench TE352FUE.

2007 Acura RL

2005-08 DRIVELINE/AXLES Rear Differential - RL

Friday, June 05, 2009 3:02:19 PM

ACCELERATION DEVICE TEST

1. Raise the vehicle, and make sure it is securely supported.

2. Connect the HDS to the DLC (A).

Fig. 162: Identifying Data Link Connector Location
Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Do the acceleration device test with the HDS.

4. Look at the results displayed on the HDS.



If the acceleration ratio is lower than the normal value when decelerating is displayed, replace
the rear differential center case.



If the acceleration ratio is higher than the normal value when decelerating is displayed, go to
step 5.



If the acceleration ratio is lower than the normal value when accelerating is displayed, go to
step 10.



If the acceleration ratio is higher than the normal value when accelerating is displayed, replace
the SH-AWD control unit.

5. Remove the 6 mm bolt (A) from the differential (B) as shown.

NOTE:



No DTC is detected.



The SH-AWD control unit has been initialized.



The shift lever is in P.

2007 Acura RL

2005-08 DRIVELINE/AXLES Rear Differential - RL

Friday, June 05, 2009 3:02:19 PM

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