Acura RL. Manual - part 770

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 for DTC 27-1 and DTC 27-2 with the HDS. 

Are DTC 27-1 and DTC 27-2 indicated at the same time?  

YES - Go to the DTC 27-1 and/or 27-2 troubleshooting first, then recheck. 

NO - Go to step 4. 

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

Are any VSA system DTCs indicated?  

YES - Go to the indicated DTCs troubleshooting. 

NO - Replace the rear differential center case (see CENTER CASE REPLACEMENT ). 

DTC 75-1: ACCELERATION DEVICE MALFUNCTION (STUCK OFF) 

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 for DTC 27-1 and DTC 27-2 with the HDS. 

Are DTC 27-1 and DTC 27-2 indicated at the same time?  

YES - Go to the DTC 27-1 and/or 27-2 troubleshooting first, then recheck. 

NO - Go to step 4. 

4. 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 5. 

5. Clear the DTC with the HDS.  

6. Start the engine.  

7. Do the shift solenoid valve function test with the HDS.  

8. Check for DTCs with the HDS. 

NOTE:

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

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:19 PM

Page 107  © 2005 Mitchell Repair Information Company, LLC. 

Is DTC 75-1 indicated?

YES - Go to step 9. 

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

9. Check the acceleration ratio in the DATA LIST with the HDS. 

Is the acceleration ratio between 0.94 and 0.98?  

YES - Go to step 10. 

NO - Replace the SH-AWD control unit (see SH-AWD CONTROL UNIT REPLACEMENT ). 

10. Check the rear differential fluid level. 

Is the fluid level OK?  

YES - Go to step 11. 

NO - Adjust the fluid to the proper level (see REAR DIFFERENTIAL FLUID INSPECTION 
AND REPLACEMENT ). 

11. Check the rear differential fluid pressure. 

Is there pressure when it is accelerating?  

YES - Replace the rear differential center case (see CENTER CASE REPLACEMENT ). 

NO - Replace the shift solenoid valve (see REAR DIFFERENTIAL 
DISASSEMBLY/REASSEMBLY ). 

DTC 75-2: ACCELERATION DEVICE MALFUNCTION (STUCK ON) 

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 for DTC 27-1 and DTC 27-2 with the HDS. 

Are DTC 27-1 and DTC 27-2 indicated at the same time?  

YES - Go to the DTC 27-1 and/or 27-2 troubleshooting first, then recheck. 

NO - Go to step 4. 

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

NOTE:

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

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:19 PM

Page 108  © 2005 Mitchell Repair Information Company, LLC. 

Are any VSA system DTCs indicated?

YES - Go to the indicated DTCs troubleshooting. 

NO - Go to step 5. 

5. Clear the DTC with the HDS.  

6. Start the engine.  

7. Do the shift solenoid valve function test with the HDS.  

8. Check for DTCs with the HDS. 

Is DTC 75-2 indicated?  

YES - Go to step 9. 

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

9. Check the acceleration ratio with the HDS. 

Is the acceleration ratio between 0.94 and 0.98?  

YES - Go to step 10. 

NO - Replace the SH-AWD control unit (see SH-AWD CONTROL UNIT REPLACEMENT ). 

10. Check the rear differential fluid pressure. 

Is there pressure when it is accelerating?  

YES - Replace the rear differential center case (see CENTER CASE REPLACEMENT ). 

NO - Replace the shift solenoid valve (see REAR DIFFERENTIAL 
DISASSEMBLY/REASSEMBLY ). 

DTC 76-1: REAR DIFFERENTIAL FLUID OVERHEATS 

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 ). 

NOTE:



When the temperature of the rear differential fluid is abnormally high, 
the SH-AWD indicator comes on. This is not necessarily a problem, but 
DTC 76-1 will be stored.  



Check the rear differential fluid level (see REAR DIFFERENTIAL FLUID 
INSPECTION AND REPLACEMENT ). If it's low, refill it, clear the DTC, 
and recheck.  



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

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:19 PM

Page 109  © 2005 Mitchell Repair Information Company, LLC. 

3. Clear the DTC with the HDS.  

4. Start the engine.  

5. Test-drive under these conditions: 



Vehicle speed at 25 mph (40 km/h) or more  



Engine speed less than 2500 RPM for at least 30 seconds.  

6. Check for DTCs with the HDS. 

Is DTC 76-1 indicated?  

YES - Go to step 7. 

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

7. Check for DTC 27-1 and DTC 27-2 with the HDS. 

Are DTC 27-1 and DTC 27-2 indicated at the same time?  

YES - Go to the DTC 27-1 and/or 27-2 troubleshooting first, then recheck. 

NO - Go to step 8. 

8. 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 9. 

9. Check for rear brake drag. 

Do the rear brakes drag?  

YES - Fix the rear brakes (see COMPONENT LOCATION INDEX ). 

NO - Go to step 10. 

10. Raise the vehicle.  

11. Raise the vehicle speed to 19 mph (30 km/h).  

12. Check the hypoid gear speed sensor value with the HDS. 

Is the hypoid gear speed sensor value shown?  

YES - Check the hypoid gear speed sensor installation. If it is installed properly, replace the rear 
differential center case (see CENTER CASE REPLACEMENT ). 

NO - Go to step 13. 

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:19 PM

Page 110  © 2005 Mitchell Repair Information Company, LLC.