Acura RL. Manual - part 775

Fig. 163: Connecting Pressure Gauge To The Differential 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

6. Connect the pressure gauge (C) to the adapter, and install the assembly into the differential (B). Route 

the hose under the vehicle toward the front door.  

7. Do the acceleration device test. When you get to the "Keep the speed constant between 22 and 28 

mph" screen in the test, write down the pressure indicated on the pressure gauge. Complete the test. 



If the hydraulic pressure was over 8.0 kg/cm

2

 , go to step 8. 

 



If the hydraulic pressure was below 8.0 kg/cm

2

 , replace the rear differential center case. 

 

8. Replace the shift solenoid.  

9. Do the acceleration device test. 



If Normal is displayed, the problem has been fixed.  



If the acceleration ratio is higher than the normal value when accelerating is displayed, replace 
the rear differential assembly.  

10. Check the differential oil level. If the oil level was low, add oil as needed, then go to step 12. If the oil 

level was OK, go to step 11.  

11. Do the acceleration device test. After the shift solenoid test (a portion of the acceleration device test) 

is complete, continue the acceleration device test. When you get to the "Keep the speed constant 
between 22 and 28 mph" screen, write down the pressure indicated on the pressure gauge. Complete 
the test. 



If the hydraulic pressure was less than 8.0 kg/cm

2

 , go to step 12. 

 



If the hydraulic pressure was over 8.0 kg/cm

2

 , replace the rear differential assembly. 

 

12. Do the acceleration device test. Look at the results displayed on the HDS. 



If Normal is displayed, the problem has been fixed.  



If "Acceleration device is abnormal" is displayed, go to step 13.  

13. Replace the shift solenoid, then do the acceleration device test. 



If Normal is displayed, the problem has been fixed.  



If "Acceleration device is abnormal" is displayed, replace the rear differential assembly.  

REAR DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT 

INSPECTION 

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:19 PM

Page 127  © 2005 Mitchell Repair Information Company, LLC. 

Clutch and Hypoid Chambers 

1. Park the vehicle on level ground, and turn the ignition switch to LOCK (0).  

2. Use solvent and a brush to wash any oil and dirt off the differential fluid inspection oil filler plugs.  

3. Remove each filler plug (A) and the sealing washer (B), then check the condition of the fluid, and 

make sure the fluid is at the proper level (C). 

Fig. 164: Identifying Filler Plug And Sealing Washer 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

4. The fluid level must reach up the bottom of the filler plug hole. If it is below the hole, add the 

recommended fluid until it runs out, then reinstall the filler plug with a new sealing washer.  

REPLACEMENT 

Clutch Chamber 

1. Park the vehicle on level ground, and turn the ignition switch to LOCK (0).  

2. Remove the filler plug (A) and the sealing washer (B). 

Fluid Capacity  

2.66 L (2.81 US qt) at fluid change  

3.11 L (3.29 US qt) at overhaul  

Recommended fluid: Honda ATF-Z1

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

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Friday, June 05, 2009 3:02:19 PM

Page 128  © 2005 Mitchell Repair Information Company, LLC. 

Fig. 165: Identifying Filler Plug, Sealing Washer And Drain Plug With Torque Specifications 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

3. Remove the drain plug (C) and the sealing washer (D), and drain the fluid.  

4. Reinstall the drain plug with a new sealing washer.  

5. Add fluid until it reaches the bottom of the filler plug hole.  

6. Reinstall the filler plug with a new sealing washer.  

Hypoid Chamber 

1. Park the vehicle on level ground, and turn the ignition switch to LOCK (0).  

2. Remove the filler plug (A) and the sealing washer (B). 

Fluid Capacity  

0.73 L (0.77 US qt) at fluid change  

0.75 L (0.79 US qt) at overhaul  

Recommended fluid: Honda ATF-Z1  

Fig. 166: Identifying Filler Plug, Drain Plug And Sealing Washer With Torque Specifications 
Courtesy of AMERICAN HONDA MOTOR CO., INC.

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

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Friday, June 05, 2009 3:02:19 PM

Page 129  © 2005 Mitchell Repair Information Company, LLC. 

3. Remove the drain plug (C) and the sealing washer (D), and drain the fluid.  

4. Reinstall the drain plug with a new sealing washer.  

5. Add fluid until it reaches the bottom of the filler plug hole.  

6. Reinstall the filler plug with a new sealing washer.  

REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR REPLACEMENT 

1. Drain the differential fluid (see REAR DIFFERENTIAL FLUID INSPECTION AND 

REPLACEMENT ).  

2. Remove the differential fluid temperature sensor cover (A), then disconnect the differential fluid 

temperature sensor connector (B). 

Fig. 167: Identifying Differential Fluid Temperature Sensor With Torque Specifications 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

3. Remove the differential fluid temperature sensor (C).  

4. Install the differential fluid temperature sensor with a new O-ring (D) in the reverse order of removal. 

5. Refill the differential fluid (see REAR DIFFERENTIAL FLUID INSPECTION AND 

REPLACEMENT ).  

HYPOID GEAR SPEED SENSOR REPLACEMENT 

1. Disconnect the hypoid gear speed sensor connector (A). 

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:19 PM

Page 130  © 2005 Mitchell Repair Information Company, LLC.