Acura RL. Manual - part 759

Fig. 70: Measuring Resistance Between SH-AWD Control Unit Connector Terminals A9 And 
A23 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there 520 ohms to 3.5 kohms with the rear differential fluid at normal temperature?  

YES - Substitute a known-good SH-AWD control unit (see SH-AWD CONTROL UNIT 
REPLACEMENT ) and recheck. 

NO - Replace the rear differential oil temperature sensor (see REAR DIFFERENTIAL FLUID 
TEMPERATURE SENSOR REPLACEMENT ). 

DTC 43-1: DIFFERENTIAL OIL TEMPERATURE SENSOR CIRCUIT 

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 DTCs with the HDS. 

Is DTC 42-1 or 42-2 indicated?  

YES - Go to the indicated DTCs troubleshooting. 

NO - Go to step 4. 

4. Clear the DTC with the HDS.  

5. Start the engine.  

6. Let the engine idle 1 minute.  

7. Check for DTCs with the HDS. 

Is DTC 43-1 indicated?  

YES - Repair short or open in the wire between SH-AWD control unit connector A and the rear 
differential oil temperature sensor connector.

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 3:02:18 PM

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© 2005 Mitchell Repair Information Company, LLC. 

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

DTC 44-11: SH-AWD CONTROL UNIT 

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. Turn the ignition switch ON (II).  

5. Check for DTCs with the HDS. 

Is DTC 44-1 Vindicated?  

YES - Substitute a known-good SH-AWD control unit (see SH-AWD CONTROL UNIT 
REPLACEMENT ) and recheck. 

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

DTC 44-12: SH-AWD RELAY 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. Clear the DTC with the HDS.  

4. Start the engine.  

5. Check for DTCs with the HDS. 

Is DTC 44-12 indicated?  

YES - Go to step 6. 

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

6. Turn the ignition switch OFF.  

7. Test the SH-AWD relay (see POWER RELAY TEST ). 

Is SH-AWD relay OK?  

YES - Go to step 8. 

NO - Replace the SH-AWD relay (see SH-AWD RELAY REPLACEMENT ). 

NOTE:

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

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 3:02:18 PM

Page 64 

© 2005 Mitchell Repair Information Company, LLC. 

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

9. Turn the ignition switch ON (II).  

10. Measure the voltage between SH-AWD control unit connector terminal A3 and body ground. 

Fig. 71: Measuring Voltage Between SH-AWD Control Unit Connector Terminal A3 And Body 
Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there battery voltage?  

YES - Replace the wire harness (see REAR DIFFERENTIAL DISASSEMBLY/REASSEMBLY ).

NO - Go to step 11. 

11. Disconnect SH-AWD control unit connector B (8P).  

12. Measure the voltage between SH-AWD control unit connector terminals B1 and B2. 

Fig. 72: Measuring Voltage Between SH-AWD Control Unit Connector Terminals B1 And B2 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there battery voltage?  

YES - Repair the wire harness. 

NO - Substitute a known-good SH-AWD control unit (see SH-AWD CONTROL UNIT 
REPLACEMENT ) and recheck. 

DTC 44-21: SH-AWD CONTROL UNIT 

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:18 PM

Page 65 

© 2005 Mitchell Repair Information Company, LLC. 

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. Turn the ignition switch OFF.  

5. Turn the ignition switch ON (II).  

6. Check for DTCs with the HDS. 

Is DTC 44-21 indicated?  

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

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

DTC 44-31: SH-AWD RELAY STUCK OFF 

1. Make sure the battery is fully changed and the charging system is working properly.  

2. Turn the ignition switch OFF.  

3. Check these fuse: 



No. 22 (70 A) fuse in the under-hood fuse/relay box.  



No. 1 (30 A) fuse in the passenger's under-hood fuse/relay box.  

Are the fuses OK?  

YES - Go to step 4. 

NO - Repair short to ground in the wire between the fuse and the SH-AWD relay, then replace the 
fuse and recheck. 

4. Turn the ignition switch ON (II).  

5. 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 ).  

6. Clear the DTC with the HDS.  

7. Start the engine.  

8. Check for DTCs with the HDS. 

Is DTC 44-31 indicated?  

YES - Go to step 9. 

NOTE:

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

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 3:02:18 PM

Page 66 

© 2005 Mitchell Repair Information Company, LLC.