Acura RL. Manual - part 745

Fig. 7: Identifying Data Link Connector Location 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

2. Turn the ignition switch ON (II).  

3. From the mode menu, select miscellaneous test, then select neutral menu and follow the screen 

prompts. 

SH-AWD CONTROL UNIT INITIALIZATION 

Whenever the SH-AWD control unit is replaced, it must initialized. 

1. With the ignition switch OFF, connect the HDS to the 16P DLC (A) behind the driver's dashboard 

lower cover. 

Fig. 8: Identifying Data Link Connector Location 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

2. Turn the ignition switch ON (II).  

3. From the mode menu, select miscellaneous test, then select neutral menu and follow the screen 

prompts. 

NOTE:

See the HDS help menu for specific instructions.

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:17 PM

Page 7 

© 2005 Mitchell Repair Information Company, LLC. 

DTC TROUBLESHOOTING INDEX 

DTC TROUBLESHOOTING CHART 

NOTE:

See the HDS help menu for specific instructions.

DTC

(1)

SH-AWD 

Indicator 

Light

Detection Item

Refer to

12-1

ON

Lateral/Longitudinal Acceleration 
Sensor Malfunction

 

12-2

ON

Lateral/Longitudinal Acceleration 
Sensor Malfunction

 

12-3

ON

Lateral/Longitudinal Acceleration 
Sensor Malfunction

 

14-1

ON

Lateral/Longitudinal Acceleration 
Sensor Neutral Position

 

14-2

ON

Lateral/Longitudinal Acceleration 
Sensor Neutral Position

 

16-1

ON

Steering Angle Sensor Signal

 

19-1

ON

Steering Angle Sensor (Open)

 

19-2

ON

Steering Angle Sensor (Short)

 

19-3

ON

Steering Angle Sensor 
Malfunction

 

19-4

ON

Steering Angle Sensor Circuit

 

27-1

ON

Hypoid Gear Speed Sensor (Open 
or Short)

 

27-2

ON

Hypoid Gear Speed Sensor 
Malfunction

 

33-1

ON

Yaw Rate Sensor Malfunction

 

33-2

ON

Yaw Rate Sensor Malfunction

 

33-3

ON

Yaw Rate Sensor Malfunction

 

35-1

ON

Yaw Rate Sensor Neutral Position

 

35-2

ON

Yaw Rate Sensor Neutral Position

 

41-1

ON

Loss of Communication with PCM

 

41-2

ON

Loss of Communication with VSA 
Modulator-Control Unit

 

41-3

ON

Loss of Communication with 
Gauge Assembly

 

42-1

ON

Differential Oil Temperature 
Sensor (Open)

 

42-2

ON

Differential Oil Temperature 
Sensor (Short)

 

43-1

ON

Differential Oil Temperature 
Sensor Circuit

 

44-11

ON

SH-AWD Control Unit

 

44-12

ON

SH-AWD Relay Stuck ON

 

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:17 PM

Page 8 

© 2005 Mitchell Repair Information Company, LLC. 

44-21

ON

SH-AWD Control Unit

 

44-31

ON

SH-AWD Relay Stuck OFF

 

44-32

ON

SH-AWD Control Unit Power 
Supply Stuck ON

 

44-41

ON

SH-AWD Control Unit Power 
Supply Stuck OFF

 

44-50

ON

SH-AWD Control Unit Power 
Supply Voltage Low

 

46-1

ON

SH-AWD Control Unit Internal 
Power Supply Circuit (Open or 
Short)

 

52-3

ON

Left Clutch Electromagnetic Coil 
Current Malfunction

 

53-1

ON

Left Clutch Electromagnetic Coil 
(Open)

 

53-2

ON

Left Clutch Electromagnetic Coil 
(Short)

 

53-3

ON

Left Clutch Electromagnetic Coil 
(Open)

 

53-4

ON

Left Clutch Electromagnetic Coil 
(Short)

 

56-3

ON

Right Clutch Electromagnetic Coil 
Current Malfunction

 

57-1

ON

Right Clutch Electromagnetic Coil 
(Open)

 

57-2

ON

Right Clutch Electromagnetic Coil 
(Short)

 

57-3

ON

Right Clutch Electromagnetic Coil 
(Open)

 

57-4

ON

Right Clutch Electromagnetic Coil 
(Short)

 

59-1

ON

SH-AWD Control Unit Power 
Supply Monitor Circuit

 

61-1

ON

Shift Solenoid Valve (Open)

 

61-2

ON

Shift Solenoid Valve (Short)

 

74-1

ON

One Way Clutch Malfunction

 

75-1

ON

Acceleration Device Malfunction 
(Stuck OFF)

 

75-2

ON

Acceleration Device Malfunction 
(Stuck ON)

 

76-1

ON

Rear Differential Fluid Overheats

 

77-1

ON

The Functional Abnormalities of 
Fuel Emission or Automatic-
Transmission

Go to DTC TROUBLESHOOTING 

INDEX and SYMPTOM 

TROUBLESHOOTING INDEX 

77-2

ON

The Functional Abnormalities of 
VSA Modulator-Control Unit

Go to DTC TROUBLESHOOTING 

INDEX and SYMPTOM 

TROUBLESHOOTING INDEX 

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:17 PM

Page 9 

© 2005 Mitchell Repair Information Company, LLC. 

SYMPTOM TROUBLESHOOTING INDEX 

SYMPTOM TROUBLESHOOTING CHART 

77-3

ON

The Functional Abnormalities of 
Gauge Assembly

Go to DTC TROUBLESHOOTING 

78-

XX

ON

SH-AWD Control Unit Self-
diagnostic Malfunction

 

81-1

ON

Left Search Coil Sensor 
Malfunction

 

81-2

ON

Left Search Coil Sensor (Open or 
Short)

 

81-3

ON

Left Clutch Electromagnetic Coil 
Magnetic Flux Characteristic

 

82-1

ON

Right Search Coil Sensor 
Malfunction

 

82-2

ON

Right Search Coil Sensor (Open or 
Short)

 

82-3

ON

Right Search Coil Sensor 
Magnetic Flux Characteristic

 

(1)

DTCs are indicated by the SH-AWD indicator when the 16P data link connector (DLC) is 
connected to the HDS.

NOTE:

Most problems in the unit are to be diagnosed by identifying noises from the 
gears or bearings. Care should be taken during diagnosis not to confuse 
differential noises with those from other drivetrain components.

Symptom

Diagnostic Procedure

Also check for

The SH-AWD indicator 
does not go off, and no 
DTCs are stored

Symptom troubleshooting (see THE SH-AWD 
INDICATOR DOES NOT GO OFF, AND 
NO DTCS ARE STORED ).

 

The SH-AWD indicator 
does not come on

Symptom troubleshooting (see THE SH-AWD 
INDICATOR DOES NOT GO OFF, AND 
NO DTCS ARE STORED ).

 

Gear or bearing noises



Fluid level too low.  



Incorrect or worn out fluid.  



Damaged or chipped gears.  



Incorrect side case clearance.  



Incorrect tire size (rolling 
circumference).  



Add fluid  



Drain and fill the 
differential  



Replace the 
differential carrier 
assembly  



Side case 
clearance 
adjustment  

Rear differential overheats



Fluid level too low.  



Incorrect fluid type.  



Incorrect tire size (rolling 
circumference).  



Add fluid  



Drain and fill the 
differential  

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:17 PM

Page 10 

© 2005 Mitchell Repair Information Company, LLC.