Rear Differential Acura MDX II

Scheme 1

Scheme 2

SH-AWD Indicator

The SH-AWD indicator comes on under certain conditions even if the AWD system is working normally. Here are some examples

1. When you use high-powered wireless equipment such as a CB or Ham radio in the vehicle.
2. When you keep spinning the rear wheels while the vehicle is stuck in sand, mud, snow, etc.
3. When the battery voltage suddenly drops below 10 volt.

After the SH-AWD indicator comes on, it stays on until you turn the ignition switch off.

Diagnostic Trouble Code (DTC)

1. The SH-AWD control unit can memorize up to eight different DTCs. The system displays the DTCs by blinking the SH-AWD indicator. Multiple DTCs are displayed in the order they occurred, beginning with the most recent.
2. If the same DTC is detected more than once, the most recent DTC is written over the earlier one. Therefore, when the same problem is detected more than once, it is memorized as a single DTC.
3. The DTCs are memorized in the EEPROM (non-volatile memory). Therefore, the memorized DTCs are not cleared when the battery is disconnected or the SH-AWD control unit is disconnected.
4. If there is a problem in the central processing unit (CPU) of the SH-AWD control unit, the SH-AWD indicator comes on, but no DTC is memorized.

Self-diagnosis

When a problem is detected by self-diagnosis, the system does the following

1. Turns the SH-AWD indicator on.
2. Memorizes the DTC.
3. Stops AWD control and puts the vehicle back in FWD.
4. Reduces engine torque to suit the driving conditions when the abnormality was detected.

How to Check for Diagnostic Trouble Codes (DTCs)

When the SH-AWD control unit senses an abnormality in the input or output systems, the SH-AWD indicator in the gauge assembly will usually come on, and the malfunction indicator lamp (MIL), the D5 indicator, and/or the ABS indicator may also come on.

Scheme 3

1. With the ignition switch OFF, connect the HDS to the data link connector (DLC) (A) behind the driver's dashboard lower cover.
2. Turn the ignition switch ON (II), and follow the prompts on the HDS to display the DTC(s) on the screen. After determining the DTC(s), refer to the «DTC TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) . NOTE: See the HDS help menu for specific instruction.
3. If there are fuel and emission DTCs, A/T DTCs, and VSA system DTCs at the same time, troubleshoot the fuel and emission DTCs first.
4. After recording the DTCs, clear all DTCs.
5. Test-drive the vehicle for several minutes in AWD mode, and check for DTCs. If the DTC returns, refer to the «DTC TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) . If the DTC does not return, there was an intermittent problem within the circuit. Make sure all connectors and terminals in the circuit are tight.

How to Troubleshoot Circuits at the SH-AWD Control Unit

Special Tools Required

Backprobe set 07SAZ-001000A (two required)

Scheme 4

Scheme 5

1. Remove the left side trim panel cover (see «TRIM REMOVAL/INSTALLATION - REAR SIDE AREA»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-rear-side-area) ).
2. Remove the cargo floor lid and the cargo box (see «TRIM REMOVAL/INSTALLATION - CARGO AREA»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-cargo-area) ).
3. Remove the SH-AWD control unit (A).
4. Inspect the circuit on the SH-AWD control unit according to the DTC Troubleshooting using the special tools and a digital multimeter or an analog circuit tester (A).
5. Connect the backprobe adapters (B) to the stacking patch cords (C), and connect the cords to the multimeter or an analog circuit tester. Using the wire insulator as a guide for the contoured-tip of the backprobe adapter, gently slide the tip into the connector from the wire side until it comes in contact with the terminal end of the wires.

Updating the SH-AWD Control Unit

Special Tools Required

1. Honda diagnostic system (HDS)
2. Honda interface module (HIM)
3. HDS pocket tester

Note. Use this procedure when you need to update the SH-AWD control unit in a troubleshooting procedure. Make sure the HDS/HIM has the latest software version. Before you update the SH-AWD control unit, make sure the battery in the vehicle is fully charged. Never turn the ignition switch OFF during the update. If there is a problem with the update, leave the ignition switch ON. To prevent SH-AWD control unit damage, do not operate anything electrical (headlights, audio system, brakes, A/C, power windows, moonroof, door locks, etc.) during the update. To ensure the latest program is installed, do an SH-AWD control unit update whenever the SH-AWD control unit is substituted or replaced. You cannot update an SH-AWD control unit with a program it already has. It will only accept a new program. If you need to diagnose the Honda interface module (HIM) because the HIM's red (#3) lamp came on or was flashed during the update, leave the ignition switch in the ON (II) position when you disconnect the HIM from the data link connector (DLC). This will prevent SH-AWD control unit damage.

1. Select the update program, and follow the screen prompts to update the SH-AWD control unit.
2. If the software in the SH-AWD control unit is the latest, disconnect the HDS/HIM from the DLC, and go back to the procedure that you were doing. If the software in the SH-AWD control unit is not the latest, follow the instructions on the screen.
3. Do the SH-AWD control unit initialization (see «SH-AWD Control Unit Initialization»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-initialization) ).
4. Do the SH-AWD differential clutch torque memorization (see «SH-AWD Differential Clutch Torque Memorization»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-differential-clutch-torque-memorization) ).
5. Do the yaw rate-lateral/longitudinal acceleration neutral position memorization (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION NEUTRAL POSITION MEMORIZATION»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__yaw-rate-laterallongitudinal-acceleration-neutral-position-m) ).

SH-AWD Differential Clutch Torque Memorization

Whenever the side clutch set is replaced, the differential clutch torque memorization must be done.

Scheme 6

1. With the ignition switch to LOCK (0), connect the HDS to the 16P DLC (A) behind the driver's dashboard lower cover.
2. Turn the ignition switch to ON (II), go to the miscellaneous test menu/neutral menu/differential torque and follow the prompts on the HDS screen. NOTE: See the HDS help menu for specific instructions.

Yaw Rate-Lateral/Longitudinal Acceleration Neutral Position Memorization

Whenever the yaw rate sensor or the lateral acceleration sensor is replaced, its neutral position memorization must be done.

Scheme 7

1. With the ignition switch to LOCK (0), connect the HDS to the 16P DLC (A) behind the driver's dashboard lower cover.
2. Turn the ignition switch to ON (II), go to the miscellaneous test menu/neutral menu/all sensor and follow the prompts on the HDS screen. NOTE: See the HDS help menu for specific instructions.

SH-AWD Control Unit Initialization

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

Scheme 8

1. With the ignition switch to LOCK (0), connect the HDS to the 16P DLC (A) behind the driver's dashboard lower cover.
2. Turn the ignition switch to ON (II), go to the miscellaneous test menu/neutral menu/all sensor and follow the prompts on the HDS screen. NOTE: See the HDS help menu for specific instructions.

DTC Troubleshooting Index

DTC TROUBLESHOOTING CHART

Symptom Troubleshooting Index

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 TROUBLESHOOTING CHART

Outline

This vehicle is equipped with a Super Handling All-wheel Drive (SH-AWD) rear differential system. This system uses electromagnetic clutches and the SH-AWD control unit to control front to rear torque distribution and independent left to right rear torque distribution. This allows the system to function as a limited slip differential and as a torque distribution system to improve standing start performance, straight-line stability, climbing, and cornering ability.

SH-AWD features include

1. Independent torque distribution to the front and rear wheels, and to the left and right wheels for neutral handling when cornering.
2. Controls differential (inside/outside) wheel speed in a turn to increase cornering stability.
3. Limited slip differential function for better acceleration.

Operation

When driving in a straight line, the front and rear wheels are traveling at the same speed. In a normal turn, the distance traveled by the front wheels is longer than that of the rear wheels. The SH-AWD system monitors the speed of the front wheels, and increases torque to the outside rear wheel proportionally. This improves stability and steering response, and on slippery surfaces it provides improved traction of the 4-wheel drive system.

Scheme 9

Scheme 10

1. The differential assembly has a conventional hypoid ring and pinion gear set.
2. The direct electromagnetic clutch system consists of the coils, the planetary gear sets, and the multi-plate clutches that are installed in the side cases on either side of the differential carrier. When driving straight ahead, both rear wheels rotate at the same speed. When turning, current is applied to the appropriate outside wheel main coil to engage the clutch. The amount of current passed through the electromagnetic clutch controls the amount of driving force to the outside wheel.

Control System

The SH-AWD control system consists of a SH-AWD control unit, the PCM, the VSA modulator-control unit, along with various sensors and switches that detect the steering angle> the lateral G force, the yaw, and the vehicle speed. A fluid temperature sensor is located on in the rear differential. The control units exchange information via the F-CAN communication lines. The SH-AWD control unit has a self-diagnostic function. If a malfunction is detected, the SH-AWD control unit turns on the SH-AWD indicator in the gauge assembly and the system goes into fail-safe mode. When in fail-safe mode, the vehicle disables the SH-AWD differential. The vehicle defaults to front wheel drive, reduces engine torque to suit the driving conditions.

Driving Force Control

The driving force control distributes the power based on the driver's inputs. It distributes torque to the front and rear wheels based on the throttle opening and the available engine torque output. When turning, torque is applied to the rear wheels independently based on the lateral G input and the direction of the turn. This generates an inward yaw movement to help steer the vehicle around the turn.

Scheme 11

Construction

The electromagnetic clutch system is incorporated into the side case assemblies on both sides of the differential case. The system consists of the multi-plate clutches, the planetary gears, the pressure guides, the solenoid coil assembly (the search coil and the main coil), the armature assembly (the slider and the armature), and the yoke.

COMPONENTS PURPOSE CHART

Scheme 12

The SH-AWD control unit receives inputs from the PCM and the VSA modulator-control unit on the driving conditions via the F-CAN. The SH-AWD control unit sends signals to the main coils, which engage the electromagnetic clutches that connect the planetary gear set. This increases the torque applied to the rear wheels. The amount of current sent to the clutch is continuously varied as driving conditions change.

Scheme 13

Search Coil Detection System

As the clutch discs wear, the air gap between the pressure guides and the multi-plate clutches increases. The increase in air gap changes the magnetic field generated by the main coil and the yoke. The search coil detects these changes in the magnetic field. The SH-AWD control unit uses predetermined maps to compensate for the changes to maintain precise control and smooth clutch engagement.

Scheme 14

Scheme 15

SH-AWD Control Unit Inputs and Outputs

The SH-AWD control unit terminal voltages and the measuring conditions for the SH-AWD control system. Do the SH-AWD inputs and outputs test with the SH-AWD connectors connected.

Scheme 16

SH-AWD CONTROL UNIT CONNECTOR TERMINAL REFERENCE - A(20P)

The SH-AWD control unit terminal voltages and the measuring conditions for the SH-AWD control system. Do the SH-AWD inputs and outputs test with the SH-AWD connectors connected.

Scheme 17

SH-AWD CONTROL UNIT CONNECTOR TERMINAL REFERENCE - B(8P)

Scheme 18

Scheme 19

DTC 12-1,12-2,12-3: Lateral Acceleration Sensor Malfunction

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

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Check for DTCs in the VSA system with the HDS. Are any lateral acceleration sensor DTCs indicated? YES -Go to the indicated DTCs troubleshooting. NO -Go to step 4.
4. Test-drive the vehicle with an assistant. Drive in a left arid right zig-zag pattern at about 13 mph (20 km/h) and check the LATERAL ACCELERATION SENSOR in the DATA LIST with the HDS. Does the sensor value change when turning? YES -Go to step 5. NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
5. Park the vehicle on a level surface.
6. Check the LATERAL ACCELERATION SENSOR in the DATA LIST with the HDS. Is there 0.1G or less? YES -Intermittent failure, the system is OK at this time. If the DTC returns, replace the SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Do the yaw rate-lateral/longitudinal acceleration neutral position memorization (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION NEUTRAL POSITION MEMORIZATION»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__yaw-rate-laterallongitudinal-acceleration-neutral-position-m) ). If the DTC returns, replace the SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 15-1: Longitudinal Acceleration Sensor Malfunction

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

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Test-drive the vehicle with an assistant. When accelerating, check the LONGITUDINAL ACCELERATION SENSOR in the DATA LIST with the HDS. Does the sensor value change when acceleration? YES -Go to step 5. NO -Replace the yaw rate-lateral/longitudinal acceleration sensor (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ).
5. Park the vehicle on a level surface.
6. Check the LONGITUDINAL ACCELERATION SENSOR in the DATA LIST with the HDS. Is there 0.1 G or less? YES -Go to step 7. NO -Do the yaw rate-lateral/longitudinal acceleration neutral position memorization (see «SH-AWD Differential Clutch Torque Memorization»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-differential-clutch-torque-memorization) ). If the DTC returns, replace the SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
7. Test-drive the vehicle for 2 minutes in a vehicle speed is kept constant at 19 mph (30 km/h).
8. Check for DTCs with the HDS. Is DTC 15-1 indicated? YES -Replace the yaw rate-lateral/longitudinal acceleration sensor (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ). NO -Intermittent failure, the system is OK at this time. If the DTC returns, replace the SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 16-3: Steering Angle Sensor Neutral Position Incorrect

Note. Before you troubleshoot, review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Check the wheel alignment (see WHEEL ALIGNMENT ). Check for installation of the steering angle sensor.

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
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 STEERING ANGLE SENSOR in the DATA LIST with the HDS. When the steering wheels is turned slowly, does the value change? YES -Go to step 6. NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
6. Test-drive the vehicle in a straight line at 19 mph (30 km/h) or more.
7. Park the vehicle on a level surface, and center the steering wheel.
8. Check the STEERING ANGLE SENSOR in the DATA LIST with the HDS. It is within ± 25 deg of center? YES -Intermittent failure, the system is OK at this time. If the DTC returns, replace the SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Do the steering angle sensor center point writing (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ). If the DTC returns, replace the SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 33-2, 33-3: Yaw Rate Sensor Malfunction

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

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Check for DTCs in the VSA system with the HDS. Are any yaw rate sensor DTCs indicated? YES -Go to the indicated DTCs troubleshooting. NO -Go to step 4.
4. Test-drive the vehicle with an assistant. Drive in a left and right zig-zag pattern at about 13 mph (20 km/h) and check the YAW RATE SENSOR in the DATA LIST with the HDS. Does the sensor value change when turning? YES -Go to step 5. NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
5. Park the vehicle on a level surface.
6. Check the YAW RATE SENSOR in the DATA LIST with the HDS. Is there 3.5 degls or less? YES -Intermittent failure, the system is OK at this time. If the DTC returns, replace the SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Do the yaw rate-lateral/longitudinal acceleration neutral position memorization (see «SH-AWD Differential Clutch Torque Memorization»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-differential-clutch-torque-memorization) ). If the DTC returns, replace the SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 41-1: F-CAN Malfunction (Lost Communication with Power Control Module (PCM))

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

Scheme 20

Scheme 21

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Check for DTCs in the PGM-FI system with the HDS. Are there any PGM-FI DTCs indicated? YES -go to . NO -Go to step 4.
4. Clear the DTC with the HDS.
5. Start the engine.
6. Check for DTCs with the HDS. Is DTC 41-1 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for intermittent open between SH-AWD control unit connector terminals A10 and A20 and PCM connector terminals A48 and A49.
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS. NOTE: This step must be done to prevent PCM damage.
9. Disconnect PCM connector A (49P).
10. Connect PCM connector terminals A 48 and A 49 to body ground with jumper wires.
11. Disconnect SH-AWD control unit connector A (20P).
12. Check for continuity between SH-AWD control unit connector terminals A10 and A20 to body ground. Is there continuity? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair open in the wires between the SH-AWD control unit and the PCM.

DTC 41-2: F-CAN Malfunction (Lost Communication with VSA)

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

Scheme 22

Scheme 23

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Check for PGM-FI DTC's with the HDS. Are there any PGM-FI DTCs indicated? YES -Go to the indicated DTC's troubleshooting. NO -Go to step 4.
4. Clear the DTC with the HDS.
5. Start the engine.
6. Check for DTCs with the HDS. Is DTC 41-2 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for intermittent open between SH-AWD control unit connector terminals A10 and A20 and VSA modulator-control unit 46P connector terminals No. 38 and No. 39.
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS. NOTE: This step must be done to prevent PCM damage.
9. Disconnect the VSA modulator-control unit 46P connector.
10. Connect VSA modulator-control unit 46P connector terminals No. 38 and No. 39 to body ground with jumper wires.
11. Disconnect SH-AWD control unit connector A (20P).
12. Check for continuity between SH-AWD control unit connector terminals A10 and A20 to body ground. Is there continuity? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair open in the wires between the SH-AWD control unit and the VSA modulator-control unit.

DTC 41-4: F-CAN Malfunction (Lost Communication with A/T Control Unit)

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

Scheme 24

Scheme 25

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Check for DTCs in the PGM-FI system with the HDS. Are there any PGM-FI DTCs 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. Check for DTCs with the HDS. Is DTC 41-4 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for intermittent open between SH-AWD control unit connector terminals A10 and A20 and PCM connector terminals A48 and A49.
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS. NOTE: This step must be done to prevent PCM damage.
9. Disconnect the PCM connector A (49P).
10. Connect PCM connector terminals A48 and A49 to body ground with jumper wires.
11. Disconnect SH-AWD control unit connector A (20P).
12. Check for continuity between SH-AWD control unit connector terminals A10 and A20 to body ground. Is there continuity? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).) NO -Repair open in the wires between the SH-AWD control unit and the PCM.

DTC 41-5: F-CAN Malfunction (Lost Communication with Yaw Rate-Lateral/Longitudinal Acceleration Sensor)

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

Scheme 26

Scheme 27

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Check for DTCs in the VSA system with the HDS. Are any yaw rate-lateral/longitudinal acceleration sensor DTCs or F-CAN 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. Check for DTCs with the HDS. Is DTC 41-5 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for intermittent open between SH-AWD control unit connector terminals A10 and A20 and yaw rate-lateral/longitudinal acceleration sensor 4P connector terminals No. 3 and No. 2.
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS. NOTE: This step must be done to prevent PCM damage.
9. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 4P connector.
10. Connect yaw rate-lateral/longitudinal acceleration sensor 4P connector terminals No. 3 and No. 2 to body ground with jumper wires.
11. Disconnect SH-AWD control unit connector A (20P).
12. Check for continuity between SH-AWD control unit connector terminals A10 and A20 to body ground. Is there continuity? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair open in the wire between the SH-AWD control unit and the yaw rate-lateral/longitudinal acceleration sensor.

DTC 41-6: F-CAN Malfunction (Lost Communication with Steering Angle Sensor)

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

Scheme 28

Scheme 29

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Check for DTCs in the VSA system with the HDS. Are any steering angle sensor DTCs of F-CAN 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. Check for DTCs with the HDS. Is DTC 41-6 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time.
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS. NOTE: This step must be done to prevent PCM damage.
9. Disconnect the steering angle sensor 5P connector.
10. Connect steering angle sensor 5P connector terminals No. 4 and No. 2 to body ground with jumper wires.
11. Disconnect SH-AWD control unit connector A (20P).
12. Check for continuity between SH-AWD control unit connector terminals A10 and A20 to body ground. Is there continuity? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair open in the wires between the SH-AWD control unit and the steering angle sensor.

DTC 42-1: Differential Fluid Temperature Sensor (Short to Power)

Note. Before you troubleshoot, review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If the vehicle has been driven, allow the rear differential to cool for about an hour or more before doing this troubleshooting procedure.

Scheme 30

Scheme 31

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Check for DTCs with the HDS. Is DTC 42-1 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the rear differential fluid temperature sensor 2P connector and SH-AWD control unit connector A (20P).
7. Check for continuity between rear differential fluid temperature sensor 2P connector terminals No. 1 and No. 2. Is there continuity? YES -Repair short in the wire between rear differential fluid temperature sensor 2P connector terminals No. 1 and No. 2. NO -Go to step 8.
8. Connect the rear differential fluid temperature sensor 2P connector.
9. Measure the differential housing temperature with an infrared temperature gauge near the mounting location of the rear differential fluid temperature sensor. The temperature should be below 176°F (80°C) before proceeding to the next step.
10. Measure resistance between SH-AWD control unit connector terminals A8 and A18. Is there 260 ohms or more? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Replace the rear differential temperature sensor (see «REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).

DTC 42-2: Differential Fluid Temperature Sensor (Open/GND Short)

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

Scheme 32

Scheme 33

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Raise the vehicle, make sure it is securely supported, and allow all four wheels to rotate freely.
5. Start the engine and turn the VSA off (the light on the VSA OFF switch comes on). Run the engine in the D position until the vehicle speed reaches 35 mph (56 km/h) and keep running for 10 minutes, then slow down and stop the wheels.
6. Check for DTCs with the HDS. Is DTC 42-2 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time.
7. Turn the ignition switch to LOCK (0).
8. Disconnect SH-AWD control unit connector A (20P).
9. Connect SH-AWD control unit connector terminal A18 to body ground with a jumper wire.
10. Disconnect the rear differential fluid temperature sensor 2P connector.
11. Check for continuity between rear differential fluid temperature sensor 2P connector terminal No. 2 and body ground. Is there continuity? YES -Go to step 12. NO -Repair open in the wire between SH-AWD control unit connector A and the rear differential fluid temperature sensor connector.
12. Connect SH-AWD control unit connector terminal A8 to body ground with a jumper wire.
13. Check for continuity between rear differential fluid temperature sensor 2P connector terminal No. 1 and body ground. Is there continuity? YES -Go to step 14. NO -Repair open in the wire between SH-AWD control unit connector A and the rear differential fluid temperature sensor connector.
14. Check for continuity between SH-AWD control unit connector terminals A9 and A18. Is there continuity? YES -Repair short in the wire between SH-AWD control unit connector A and the rear differential fluid temperature sensor connector. NO -Go to step 15.
15. Check for continuity between SH-AWD control unit connector terminals A8 and A9. Is there continuity? YES -Repair short in the wire between SH-AWD control unit connector A and the rear differential fluid temperature sensor connector. NO -Go to step 16.
16. Reconnect the rear differential fluid temperature sensor 2P connector and SH-AWD control unit connector A (20P).
17. Measure resistance between SH-AWD control unit connector terminals A8 and A18. Is there 12.67 kohms or less? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Replace the rear differential fluid temperature sensor (see «REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).

DTC 43-1: Differential Fluid Temperature Sensor Circuit Malfunction

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

Scheme 39

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
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. Test-drive the vehicle for 5 minutes.
8. Check for DTCs with the HDS. Is DTC 43-1 indicated? YES -Go to step 9. NO -Intermittent failure, the system is OK at this time.
9. Turn the ignition switch to LOCK (0).
10. Disconnect SH-AWD control unit connector A (20P).
11. Disconnect the rear differential fluid temperature sensor 2P connector.
12. Check for continuity between rear differential fluid temperature sensor 2P connector terminals No. 1 and No. 2. Is there continuity? YES -Repair short in the wire between rear differential fluid temperature sensor 2P connector terminals No. 1 and No. 2. NO -Go to step 13.
13. Reconnect all connectors.
14. Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
15. Start the engine.
16. Let the engine idle 1 minute.
17. Check for DTCs with the HDS. Is DTC 43-1 indicated? YES -Replace the rear differential fluid temperature sensor (see «REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ). NO -Replace the original SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 44-11: SH-AWD Control Unit

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

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Check for DTCs with the HDS. Is DTC 44-11 indicated? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Intermittent failure, the system is OK at this time.

DTC 44-12: SH-AWD Relay Stuck ON

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

Scheme 40

Scheme 41

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
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 to LOCK (0).
7. Remove the SH-AWD relay (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ), then test the SH-AWD relay (see «POWER RELAY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#relays__power-relay-test) ). Is the SH-AWD relay OK? YES -Go to step 8. NO -Replace the SH-AWD relay (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
8. Disconnect SH-AWD control unit connector A (20P).
9. Turn the ignition switch to ON (II).
10. Measure voltage between SH-AWD control unit connector terminal A17 and body ground. Is there battery voltage? YES -Repair short to power in the wire between the SH-AWD control unit and the SH-AWD relay (FSR line). NO -Go to step 11.
11. Disconnect SH-AWD control unit connector B (8P).
12. Measure voltage between SH-AWD control unit connector terminals B1 and B2. Is there battery voltage? YES -Repair short to power in the wire between the SH-AWD control unit and the SH-AWD relay (PWR line). NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 44-32: SH-AWD Control Unit Power Supply Stuck ON

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

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Start the engine.
5. Check for DTCs with the HDS. Is DTC 44-32 indicated? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Intermittent failure, the system is OK at this time.

DTC 44-41: SH-AWD Control Unit Power Supply Stuck OFF

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

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Start the engine.
5. Check for DTCs with the HDS. Is DTC 44-41 indicated? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Intermittent failure, the system is OK at this time.

DTC 44-50: SH-AWD Control Unit Power Supply Voltage Low

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

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

1. Make sure the battery is fully changed and the charging system is working properly.
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Turn the ignition switch to LOCK (0).
4. Check these fuse: No. 3 (RR F/B) (60 A) fuse in the main under-hood fuse/relay box. No. 9 (30 A) fuse in the rear fuse/relay box. Are the fuses OK? YES -Go to step 5. NO -Replace the blown fuses and recheck. If the No. 3 (60 A) and No. 9 (30 A) fuses blows again, repair short to ground in the wire between the fuse and the SH-AWD relay, then replace the fuse and recheck.
5. Clear the DTC with the HDS.
6. Start the engine.
7. Check for DTCs with the HDS. Is DTC 44-50 indicated? YES -Go to step 8. NO -Intermittent failure, the system is OK at this time.
8. Turn the ignition switch to LOCK (0).
9. Remove the SH-AWD relay (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ), then test the SH-AWD relay (see «POWER RELAY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#relays__power-relay-test) ). Is the SH-AWD relay OK? YES -Go to step 10. NO -Replace the SH-AWD relay (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
10. Measure voltage between SH-AWD relay 4P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 11. NO -Repair open in the wire between the No. 1 fuse in the under-hood fuse relay box and the SH-AWD relay.
11. Disconnect SH-AWD control unit connector A (20P) and connector B (8P).
12. Check for continuity between SH-AWD control unit connector terminal B1 and SH-AWD relay 4P connector terminal No. 2. Is there continuity? YES -Go to step 13. NO -Repair open in the wire between SH-AWD control unit connector B and the SH-AWD relay connector.
13. Check for continuity between SH-AWD control unit connector terminal A17 and SH-AWD relay 4P connector terminal No. 3. Is there continuity? YES -Go to step 14. NO -Repair open in the wife between SH-AWD control unit connector A and the SH-AWD relay connector.
14. Check for continuity between SH-AWD relay 4P connector terminal No. 4 and body ground. Is there continuity? YES -Go to step 15. NO -Repair open in the wire between the SH-AWD relay and body ground.
15. Check for continuity between SH-AWD relay 4P connector terminals No. 1 and No. 3 to body ground (G604). Is there battery continuity? YES -Repair short in the wire between the SH-AWD relay and body ground: NO -Check for loose connector terminals at the SH-AWD control unit. If the connections are OK, update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 49-1: SH-AWD Control Unit (PG Line Open)

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

Scheme 47

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Check for DTCs with the HDS. Is DTC 49-1 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Measure voltage between SH-AWD control unit connector terminal B2 and body ground. Is there less than 0.5 V? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair open in the wire between SH-AWD control unit connector B and body ground or poor ground (G603).

DTC 52-3: Left Clutch Electromagnetic Coil Current Malfunction

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

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Do the clutch function test with the HDS (see «SH-AWD Function Test»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-function-test) ).
5. Check for DTCs with the HDS. Is DTC 52-3 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Measure voltage between SH-AWD control unit connector terminal B2 and body ground. Is there less than 0.5 V? YES -Go to step 7. NO -Repair open in the wire between SH-AWD control unit connector B and body ground or poor ground (G603).
7. Turn the ignition switch to LOCK (0).
8. Disconnect SH-AWD control unit connector B (8P).
9. Connect SH-AWD control unit connector terminals B4 and B5 with a jumper wire. Disconnect the left solenoid 4P connector, then check for continuity between left solenoid 4P connector terminals No. 1 and No. 2. Is there continuity? YES -Go to step 10. NO -Repair open in the wires between the SH-AWD control unit and the left clutch electromagnetic coil.
10. Remove the jumper wire from SH-AWD control unit connector terminals B4 and B5.
11. Check for continuity between SH-AWD control unit connector terminals B2 and B4, then check for continuity between SH-AWD control unit connector terminals B2 and B5. Is there continuity? YES -Repair short to ground or short to the ground wire between the SH-AWD control unit and the left clutch electromagnetic coil. NO -Go to step 12.
12. Check for continuity between SH-AWD control unit connector terminals B4 and B5. Is there continuity? YES -Repair short in the wires between the SH-AWD control unit and the left clutch electromagnetic coil. NO -Go to step 13.
13. Turn the ignition switch to ON (II).
14. Measure voltage between SH-AWD control unit connector terminals B2 and B5. Is there more than 0.5 V? YES -Repair short to power in the wires between the SH-AWD control unit and the left clutch electromagnetic coil. NO -Go to step 15.
15. Measure voltage between SH-AWD control unit connector terminals B2 and B4. Is there more than 0.5 V? YES -Repair short to power in the wire between SH-AWD control unit connector terminal B4 and the left clutch electromagnetic coil. NO -Substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ) and recheck. If the symptom/indication goes away with the updated SH-AWD control unit, replace the rear differential left side case (see «SIDE CASE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).

DTC 53-1,53-3: Left Clutch Electromagnetic Coil Malfunction

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

Scheme 56

Scheme 57

Scheme 58

Scheme 59

Scheme 60

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Do the clutch function test with the HDS (see «SH-AWD Function Test»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-function-test) ).
5. Check for DTCs with the HDS. Is DTC 53-1 or 53-3 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Turn the ignition switch to LOCK (0).
7. Disconnect SH-AWD control unit connector B (8P) and the left solenoid 4P connector.
8. Connect between left solenoid 4P connector terminal No. 1 to body ground with a jumper wire.
9. Check for continuity between SH-AWD control unit connector terminal B5 and body ground. Is there continuity? YES -Go to step 10. NO -Repair open in the wires between the SH-AWD control unit and the left clutch electromagnetic coil.
10. Remove the jumper wire from left solenoid 4P connector terminal No. 1.
11. Connect between left solenoid 4P connector terminal No. 2 to body ground with a jumper wire.
12. Check for continuity between SH-AWD control unit connector terminal B4 and body ground. Is there continuity? YES -Go to step 13. NO -Repair open in the wires between the SH-AWD control unit and the left clutch electromagnetic coil.
13. Remove the jumper wire from left solenoid 4P connector terminal No. 1.
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II).
16. Check the REAR DIFFERENTIAL FLUID TEMPERATURE in the DATA LIST is above 68°F (20°C) with the HDS before proceeding to the next step. If the temperature is below 68°F (20°C), drive the vehicle to warm up the rear differential until the fluid temperature becomes above 68°F (20°C).
17. Turn the ignition switch to LOCK (0).
18. Disconnect the left solenoid 4P connector.
19. Measure resistance between left solenoid 4P connector terminals No. 1 and No. 2. Is there 1.8 0. or more? YES -Replace the rear differential left side case (see «SIDE CASE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ). NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 53-2: Left Clutch Electromagnetic Coil (Short)

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

Scheme 61

Scheme 62

Scheme 63

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Do the clutch function test with the HDS (see «SH-AWD Function Test»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-function-test) ).
5. Check for DTCs with the HDS. Is DTC 53-2 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Turn the ignition switch to LOCK (0).
7. Disconnect SH-AWD control unit connector B (8P) and the left solenoid 4P connector.
8. Check for continuity between SH-AWD control unit connector terminals B4 and B5. Is there continuity? YES -Repair short in the wires between SH-AWD control unit connector terminals B4 and B5. NO -Go to step 9.
9. Turn the ignition switch to ON (II).
10. Measure voltage between SH-AWD control unit connector terminal B4 and body ground. Is there more than 0.5 V? YES -Repair short to power in the wires between SH-AWD control unit connector terminal B4 and the left clutch electromagnetic coil. NO -Go to step 11.
11. Turn the ignition switch to LOCK (0).
12. Reconnect all connectors.
13. Turn the ignition switch to ON (II).
14. Check the REAR DIFFERENTIAL FLUID TEMPERATURE in the DATA LIST is above 68°F (20°C) with the HDS before proceeding to the next step. If the temperature is below 68°F (20°C), drive the vehicle to warm up the rear differential until the fluid temperature becomes above 68°F (20°C).
15. Turn the ignition switch to LOCK (0).
16. Disconnect the left solenoid 4P connector.
17. Measure resistance between left solenoid 4P connector terminals No. 1 and No. 2. Is there 0.45 0. or less? YES -Replace the rear differential left side case (see «SIDE CASE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ). NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 56-3: Right Clutch Electromagnetic Coil Current Malfunction

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

Scheme 64

Scheme 65

Scheme 66

Scheme 67

Scheme 68

Scheme 69

Scheme 70

Scheme 71

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Do the clutch function test with the HDS (see «SH-AWD Function Test»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-function-test) ).
5. Check for DTCs with the HDS. Is DTC 56-3 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Measure voltage between SH-AWD control unit connector terminals B2 and body ground. Is there less than 0.5 V? YES -Go to step 7. NO -Repair open in the wire between SH-AWD control unit connector B and body ground or poor ground (G603).
7. Turn the ignition switch to LOCK (0).
8. Disconnect SH-AWD control unit connector B (8P).
9. Connect SH-AWD control unit connector terminals B6 and B7 with a jumper wire. Disconnect the right solenoid 4P connector, then check for continuity between right solenoid 4P connector terminals No. 1 and No. 2. Is there continuity? YES -Go to step 10. NO -Repair open in the wire between the SH-AWD control unit and the right clutch electromagnetic coil.
10. Remove the jumper wire from SH-AWD control unit connector terminals B6 and B7.
11. Check for continuity between SH-AWD control unit connector terminals B2 and B6, then check for continuity between SH-AWD control unit connector terminals B2 and B7. Is there continuity? YES -Repair short to ground or short to the ground wire between the SH-AWD control unit and the right clutch electromagnetic coil. NO -Go to step 12.
12. Check for continuity between SH-AWD control unit connector terminals B6 and B7. Is there continuity? YES -Repair short in the wires between the SH-AWD control unit and the right clutch electromagnetic coil. NO -Go to step 13.
13. Turn the ignition switch to ON (II).
14. Measure voltage between SH-AWD control unit connector terminals B2 and B7. Is there more than 0.5 V? YES -Repair short to power in the wire between SH-AWD control unit and the right clutch electromagnetic coil. NO -Go to step 15.
15. Measure voltage between SH-AWD control unit connector terminals B2 and B6. Is there more than 0.5 V? YES -Repair short to power in the wire between SH-AWD control unit connector terminal B6 and the right clutch electromagnetic coil. NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 57-1,57-3: Right Clutch Electromagnetic Coil Malfunction

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

Scheme 72

Scheme 73

Scheme 74

Scheme 75

Scheme 76

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Do the clutch function test with the HDS (see «SH-AWD Function Test»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-function-test) ).
5. Check for DTCs with the HDS. Is DTC 57-1 or 57-3 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Turn the ignition switch to LOCK (0).
7. Disconnect SH-AWD control unit connector B (8P) and the right solenoid 4P connector.
8. Connect between right solenoid 4P connector terminal No. 1 to body ground with a jumper wire.
9. Check for continuity between SH-AWD control unit connector terminal B7 and body ground. Is there continuity? YES -Go to step 10. NO -Repair open in the wires between the SH-AWD control unit and the right clutch electromagnetic coil.
10. Remove the jumper wire from right solenoid 4P connector terminal No. 1.
11. Connect between right solenoid 4P connector terminal No. 2 to body ground with a jumper wire.
12. Check for continuity between SH-AWD control unit connector terminal B6 and body ground. Is there continuity? YES -Go to step 13. NO -Repair open in the wires between the SH-AWD control unit and the right clutch electromagnetic coil.
13. Remove the jumper wire from right solenoid 4P connector terminal No. 1.
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II).
16. Check the REAR DIFFERENTIAL FLUID TEMPERATURE in the DATA LIST is above 68°F (20 °C) with the HDS before proceeding to the next step. If the temperature is below 68°F (20°C), drive the vehicle to warm up the rear differential until the fluid temperature becomes above 68°F (20°C).
17. Disconnect the right solenoid 4P connector.
18. Measure resistance between right solenoid 4P connector terminals No. 1 and No. 2. Is there 1.8 Q, or more? YES -Replace the rear differential right side case (see «SIDE CASE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ). NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 57-2: Right Clutch Electromagnetic Coil (Short)

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

Scheme 77

Scheme 78

Scheme 79

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Do the clutch function test with the HDS (see «SH-AWD Function Test»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-function-test) ).
5. Check for DTCs with the HDS. Is DTC 57-2 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Turn the ignition switch to LOCK (0).
7. Disconnect SH-AWD control unit connector B (8P) and the right solenoid 4P connector.
8. Check for continuity between SH-AWD control unit connector terminals B6 and B7. Is there continuity? YES -Repair short in the wires between SH-AWD control unit connector terminals B6 and B7. NO -Go to step 9.
9. Turn the ignition switch to ON (II).
10. Measure voltage between SH-AWD control unit connector terminal B6 and body ground. Is there more than 0.5 V? YES -Repair short to power in the Wires between SH-AWD control unit connector terminal B6 and the right clutch electromagnetic coil. ' NO -Go to step 11.
11. Turn the ignition switch to LOCK (0).
12. Reconnect all connectors.
13. Turn the ignition switch to ON (II).
14. Check the REAR DIFFERENTIAL FLUID TEMPERATURE in the DATA LIST is above 68°F (20 *C) with the HDS before proceeding to the next step. If the temperature is below 68°F (20°C), drive the vehicle to warm up the rear differential until the fluid temperature becomes above 68°F (20°C).
15. Turn the ignition switch to LOCK (0).
16. Disconnect the right solenoid 4P connector.
17. Measure resistance between right solenoid 4P connector terminals No. 1 and No. 2. Is there 0.45 0. or less? YES -Replace the rear differential right side case (see «SIDE CASE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ). NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

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

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. 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 4.
4. Clear the DTC with the HDS.
5. Start the engine.
6. Test-drive the vehicle at 10 mph (15 km/h).
7. Check for WHEEL SPEED in the DATA LIST with the HDS. Are all wheel speed the same? YES -Intermittent failure, the system is OK at this time. NO -Go to step 8.
8. Turn the ignition switch to LOCK (0).
9. Check for rear brake drag. Are the rear brakes OK? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair the rear brakes (see «BRAKE SYSTEM INSPECTION AND TEST»(/acura/mdx/ii-2006-2010/remont/mechanical-hydraulic/#conventional-brake-components__brake-system-inspection-and-test) ).

DTC 77-1: The Functional Abnormalities of Fuel Emission

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

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Start the engine.
5. Check for DTCs with the HDS. Is DTC 77-1 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Check for DTCs in the PGM-FI system with the HDS. Are any PGM-FI system DTCs indicated? YES -Go to the indicated DTCs troubleshooting. NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 77-2: The Functional Abnormalities Of VSA Modulator-Control Unit

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

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Start the engine.
5. Check for DTCs with the HDS. Is DTC 77-2 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Check for DTCs in the VSA system with the HDS. Are any VSA system DTCs indicated? YES -Go to the indicated DTC's troubleshooting. NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

77-4: The Functional Abnormalities Of Automatic-Transmission

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

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Start the engine.
5. Check for DTCs with the HDS. Is DTC 77-4 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Check for DTCs in the A/T system with the HDS. Are any A/T system DTCs indicated? YES -Go to the indicated DTCs troubleshooting. NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 77-5: Yaw Rate-Lateral/Longitudinal Acceleration Sensor Malfunction

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

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Start the engine.
5. Check for DTCs with the HDS. Is DTC 77-5 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Check for DTCs in the VSA system with the HDS. Are any yaw rate-lateral acceleration sensor DTCs indicated? YES -go to the indicated DTCs troubleshooting. NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 77-6: Steering Angle Sensor Malfunction

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

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Clear the DTC with the HDS.
4. Start the engine.
5. Check for DTCs with the HDS. Is DTC 77-6 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. 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 -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 78-xx ("x" can be 0 thru 9 or A thru F): SH-AWD Control Unit Self-Diagnostic Malfunction

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

1. Clear the DTC with the HDS.
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Turn the ignition switch to ON (II).
4. Check for DTCs with the HDS. Is DTC 78-xx indicated? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Intermittent failure, the system is OK at this time.

DTC 81-1: Left Search Coil Sensor Malfunction

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

Scheme 80

Scheme 81

Scheme 82

Scheme 83

Scheme 84

Scheme 85

1. Disconnect SH-AWD control unit connector A (20P).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
3. Check for continuity between SH-AWD control unit connector terminals A1 and A11. Is there continuity? YES -Go to step 4. NO -Go to step 7 .
4. Check the REAR DIFFERENTIAL FLUID TEMPERATURE in the DATA LIST is above 68°F (20°C) with the HDS before proceeding to the next step. If the temperature is below 68°F (20°C), drive the vehicle to warm up the rear differential until the fluid temperature becomes above 68°F (20 'C).
5. Measure resistance between SH-AWD control unit connector terminals A1 and A11. Is there 2.0 ohms or more? YES -Go to step 6. NO -Go to step 8 .
6. Check for continuity between SH-AWD control unit connector terminal A1 and body ground. Is there continuity? YES -Repair short in the wire between SH-AWD control unit connector terminal A1 and body ground. NO -Check for loose connector terminals at the SH-AWD control unit and repair if necessary. If the connections are OK, update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
7. Connect SH-AWD control unit connector terminals A1 and A11 with a jumper wire. Disconnect the left solenoid 4P connector, then check for continuity between left solenoid 4P connector terminals No. 3 and No. 4. Is there continuity? YES -Replace the rear differential left side case (see «SIDE CASE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ). NO -Repair open in the wire between left solenoid 4P connector terminals No. 3 and No. 4.
8. Disconnect the left solenoid 4P connector.
9. Check for continuity between left solenoid 4P connector terminals No. 3 and No. 4. Is there continuity? YES -Repair short in the wires between SH-AWD control unit connector A and the left search coil sensor connector. NO -Replace the rear differential left side case (see «SIDE CASE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).

DTC 82-1: Right Search Coil Sensor Malfunction

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

Scheme 86

Scheme 87

Scheme 88

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Scheme 90

Scheme 91

1. Disconnect SH-AWD control unit connector A (20P).
2. Check for continuity between SH-AWD control unit connector terminals A3 and A12. Is there continuity? YES -Go to step 3. NO -Go to step 6 .
3. Check the REAR DIFFERENTIAL FLUID TEMPERATURE in the DATA LIST is above 68°F (20°C) with the HDS before proceeding to the next step. If the temperature is below 68°F (20°C), drive the vehicle to warm up the rear differential until the fluid temperature becomes above 68°F (20°C).
4. Measure resistance between SH-AWD control unit connector terminals A3 and A12. Is there 2.0 ohms or more? YES -Go to step 5. NO -Go to step 7 .
5. Check for continuity between SH-AWD control unit connector terminal A3 and body ground. Is there continuity? YES -Repair short in the wire between SH-AWD control unit connector terminal A3 and body ground. NO -Check for loose connector terminals at the SH-AWD control unit and repair if necessary. If the connections are OK, update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
6. Connect SH-AWD control unit connector terminals A3 and A12 with a jumper wire. Disconnect the right solenoid 4P connector, then check for continuity between right solenoid 4P connector terminals No. 3 and No. 4. Is there continuity? YES -Replace the rear differential right side case (see «SIDE CASE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ). NO -Repair open in the wires between right solenoid 4P connector terminals No. 3 and No. 4.1
7. Disconnect the right solenoid 4P connector.
8. Check for continuity between right solenoid 4P connector terminals No. 3 and No. 4. Is there continuity? YES -Repair short to ground in the wires between SH-AWD control unit connector A and the right search coil sensor connector. NO -Replace the rear differential right side case (see «SIDE CASE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).

DTC 91-1: SH-AWD Control Unit Programming Error

Note. Before you troubleshoot, review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). DTC 91-1 is stored when the SH-AWD system update is not completed. Do not turn the ignition switch OFF while updating the SH-AWD system. If you turn the ignition switch OFF before completion, the SH-AWD system can be damaged.

1. Do the SH-AWD system update procedure (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ).
2. Check for DTCs with the HDS. Is DTC 91-1 indicated? YES -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Update is complete.

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

Note. Before you troubleshoot, review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Make sure the No. 3 (RR F/B) (60 A) fuse in the main under-hood fuse box is OK. Make sure the No. 9 (30 A) fuse in the rear fuse/relay box is OK. Make sure there are on loose connector terminals at the SH-AWD control unit. Make sure charging system is OK. Make sure the PGM-FI system and the A/T system is not in the middle of updating.

1. Test the battery (see «BATTERY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#battery) ). Charge or replace the battery if necessary.
2. Check the COMPLETE MEMORIZATION in the DATA LIST with the HDS. Does the data list show complete? YES -Go to step 3. NO -Do the SH-AWD system memorization procedure (see «SH-AWD Differential Clutch Torque Memorization»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-differential-clutch-torque-memorization) ), then go to step 3.
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»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) ). NO -Update the SH-AWD control unit if it does not have the latest software (see «UPDATING THE SH-AWD CONTROL UNIT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

The SH-AWD indicator does not come on

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

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
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 to LOCK (0).
5. Disconnect SH-AWD control unit connector A (20P) and connector B (8P).
6. Turn the ignition switch to 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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__updating-the-sh-awd-control-unit) ), or substitute a known-good SH-AWD control unit (see «SH-AWD Control Unit Replacement»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__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»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Go to the gauge control system DTC troubleshooting (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) ).

SH-AWD Function Test

Special Tools Required

Adapter, torque wrench 070AJ-SJAA101

Direct Electromagnetic Clutch Test

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 size and wear are the same between the left and right tires.

Scheme 92

Scheme 93

1. Check that the differential fluid temperature is over 68°F (20°C) with the HDS. If it is below 68°F (20°C), raise the temperature by driving the vehicle in circles or by constantly turning.
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 torque wrench adapter on the rear wheel hub.
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). NOTE: Use a torque wrench capable of measuring up to 80 kgf.m (580 lbf.ft) such as a commercially available Snap-on torque wrench TE352FUE.
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 fluid, and retest. If the result still shows the clutch driving force is abnormal, replace the right and left differential side case (see «SIDE CASE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).

Scheme 94

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 the 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).
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.

Scheme 95

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 2.53 L (2.67 US qt, 2.23 lmp qt) at fluid change 2.77 L (2.93 US qt, 2.44 lmp qt) at overhaul
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 (D).
5. Add fluid until it reaches the bottom of the filler plug hole.
6. Reinstall the filler plug with a new sealing washer.

Scheme 96

1. Drain the differential fluid (see «REAR DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).
2. Remove the differential fluid temperature sensor cover (A) and the differential fluid temperature sensor harness stay (B), then disconnect the differential fluid temperature sensor connector (C).
3. Remove the differential fluid temperature sensor (D).
4. Install the differential fluid temperature sensor with a new O-ring (E) in the reverse order of removal.
5. Refill the differential fluid (see «REAR DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).

SH-AWD Control Unit Replacement

Note. The SH-AWD control unit must be initialized (see SH-AWD Control Unit Initialization ) after replacement, other wise the SH-AWD system will not function.

Scheme 97

1. Remove the rear left side trim panel cover (see «TRIM REMOVAL/INSTALLATION - REAR SIDE AREA»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-rear-side-area) ).
2. Remove the cargo floor lid and the cargo box (see «TRIM REMOVAL/INSTALLATION - CARGO AREA»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-cargo-area) ).
3. Remove the SH-AWD control unit (A).
4. Disconnect the SH-AWD control unit connectors (B).
5. Install the SH-AWD control unit in the reverse order of removal.

Scheme 98

1. Remove the rear left side trim panel cover (see «TRIM REMOVAL/INSTALLATION - REAR SIDE AREA»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-rear-side-area) ).
2. Remove the SH-AWD relay (A).
3. Install the SH-AWD relay in the reverse order of removal.

Scheme 99

Scheme 100

1. Remove the cargo floor lid and the cargo box (see «TRIM REMOVAL/INSTALLATION - CARGO AREA»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-cargo-area) ).
2. Remove the breather hose clips (A), then disconnect the breather hoses (B).
3. Remove the breather box clips (C) and the breather box (D).
4. Install the breather box, then connect the breather hose and the breather hose clips.
5. Align the point marks (E) on the breather hose as shown.
6. Make sure that all the hoses are properly routed, clipped into place, and not pinched.
7. Install the cargo floor lid and the cargo box (see «TRIM REMOVAL/INSTALLATION - CARGO AREA»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-cargo-area) ).

Special Tools Required

Driveshaft remover 07AAD-S3VA000

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Scheme 105

1. Drain the differential fluid (see «REAR DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).
2. Remove the exhaust pipe (A).
3. Remove the right rear driveshaft (see «REAR DRIVESHAFT REMOVAL»(/acura/mdx/ii-2006-2010/remont/axle-shafts/#drivelineaxle__rear-driveshaft-removal) ).
4. Make a reference mark (A) across the propeller shaft (B) and rear differential companion flange (C). Separate the propeller shaft from the rear differential. NOTE: Suspend the propeller shaft with an appropriate size wire.
5. Place the transmission jack (A) under the rear differential (B).
6. Using the driveshaft remover (C) and the hammer, and disconnect the left rear inboard joint (D) from the rear differential.
7. Remove the rear differential mounting bolts (E).
8. Lower the rear differential a little on the transmission jack, then remove the left rear driveshaft inboard joint from the rear differential. NOTE: Make sure not to over extend the harness and the tube.
9. Disconnect the right solenoid 4P connector (A) and the rear differential fluid temperature sensor 2P connector (B), then remove the harness clip (C).
10. Disconnect the breather tube (D) from the breather pipe (E).
11. Slowly lower the rear differential a little on the transmission jack. NOTE: Make sure not to over extend the harness.
12. Disconnect the left solenoid 4P connector (A), then remove the harness clips (B).
13. Disconnect the ground cable (C) from the rear differential.
14. Lower the rear differential on the transmission jack.

Scheme 106

Scheme 107

Scheme 108

Scheme 109

Scheme 110

1. Raise the rear differential with the transmission jack.
2. If the original differential is being reinstalled, replace the set rings.
3. Raise the rear differential a little on the transmission jack.
4. Connect the ground cable (A) to the rear differential.
5. Connect the left solenoid 4P connector (B), then install the harness clips (C).
6. Raise the rear differential a little on the transmission jack.
7. Connect the breather tube (A) to the breather pipe (B) and the clip (C).
8. Connect the right solenoid 4P connector (D) and the rear differential fluid temperature sensor 2P connector (E), then install the harness clip (F).
9. Install the left rear driveshaft inboard joint (A) to the rear differential.
10. Raise the rear differential to the mounting level, then hand tighten the new rear differential rear mounting bolts (B) and rear differential front mounting bracket bolts (C).
11. Loosen the rear differential front mounting bolts (D).
12. Tighten the new rear differential rear mounting bolt, then tighten the rear differential front mounting bracket bolts.
13. Tighten the new rear differential front mounting bolts.
14. Attach the propeller shaft (A) to the rear differential (B) by aligning the reference marks (C) you made during the removal procedure.
15. Install the right rear driveshaft (see «REAR DRIVESHAFT INSTALLATION»(/acura/mdx/ii-2006-2010/remont/axle-shafts/#drivelineaxle__rear-driveshaft-installation) ).
16. Install the new exhaust pipe gasket (A) and exhaust pipe (B) with new nuts (C).
17. Refill the differential fluid (see «REAR DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).
18. Check the wheel alignment, and adjust it if necessary (see «WHEEL ALIGNMENT»(/acura/mdx/ii-2006-2010/remont/wheel-alignment/#front-suspension-and-rear-suspension-alignment__wheel-alignment) ).

Scheme 111

Center Case Oil Seal Replacement

Special Tools Required

1. Companion flange holder 07XAB-001A101
2. Oil seal driver C 070AD-STK0130
3. Fork seal driver weight 07747-0010100

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Scheme 137

Scheme 138

Scheme 139

Scheme 140

1. Remove the rear differential (see «REAR DIFFERENTIAL REMOVAL»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).
2. Remove the rear differential front mounting brackets (A) from the rear differential (B).
3. Remove the rear differential fluid temperature sensor cover (A), rear differential fluid temperature sensor (B), O-ring (C), and rear differential harness bracket (D) with bolts.
4. Remove the left side case (A), the right side case (B), the four 10x12 mm dowel pins (C).
5. Remove the mounting bolts (A) in a crisscross pattern in several steps, then remove the bearing set plate (B) and the 83 mm shim (C).
6. Remove the six mounting bolts (A) in a crisscross pattern in several steps, then remove the differential housing assembly (B) and dowel pins (C).
7. Remove the ring gear assembly (A), bearing outer races (B), 75 mm shim (C), and the 8 x 14 mm dowel pins (D).
8. Raise the locknut tab (A) from the groove of the input shaft, making sure that the tab completely clears the groove to prevent damaging the input shaft.
9. Install the companion flange holder (A) on the companion flange. Loosen the 27 mm locknut (left-hand threads).
10. Loosen the locknut (A) clockwise so that its tab (B) comes out from the groove (C) in the input shaft.
11. Tighten the locknut (A) until its tab (B) aligns with the groove (C).
12. Remove any dirt from inside of the groove in the input shaft, then loosen the locknut.
13. Remove the 27 mm locknut (A), the 27 mm spring washer (B), the 28 mm back-up ring (C), and the 28 mm O-ring (D).
14. Make a reference mark (A) across the input shaft (B) and companion flange (C), then remove the companion flange.
15. Remove the drive pinion (A), pinion spacer (B), and the thrust washer (C) by tapping on the drive pinion with a plastic hammer. NOTE: Support it by wooden board not to damage the drive pinion.
16. Remove the front case oil seal (A) with a commercially available seal remover. NOTE: Remove the oil seal with care so you do not damage the inside surface of the differential carrier seal surface.
17. Apply ATF to the tapered roller bearing (A), then install the new front case oil seal (B) with the oil seal driver C and fork seal driver weight (D).
18. Apply ATF to the tapered roller bearing (A), then install the drive pinion (B), pinion spacer (C), and the thrust washer (D) into the differential carrier (E). NOTE: Be sure to install the pinion spacer in the direction shown.
19. Install the companion flange (A) on the input shaft (B) by aligning the reference mark (C).
20. Apply ATF to the new 28 mm O-ring (A), then install the new 28 mm O-ring, the 28 mm backup ring (B), the 27 mm spring washer (C), and the new 27 mm locknut (D).
21. Install the companion flange holder (A) to the companion flange, then tighten the locknut (left-hand threads).
22. Rotate the drive pinion several times to assure proper tapered roller bearing contact. Measure the drive pinion turning torque. If the drive pinion turning torque exceeds the standard, replace the pinion spacer. If the drive pinion turning torque is less than the standard, adjust by tightening the locknut a little at a time, but keep the torque within 186-353 N.m (19.0-36.0 kgf.m, 137-260 lbf.ft). If this is not possible, replace the pinion spacer.
23. Stake the, locknut tab (A) into the groove in the input shaft.
24. Apply ATF to the tapered roller bearings, then install the ring gear assembly (A), bearing outer races (B), 75 mm shim (C), and the 8 x 14 mm dowel pins (D).
25. Remove the dirt and oil from the sealing surfaces. Apply liquid gasket (P/N 08718-0001) to the sealing surface. Make sure you seal the entire circumference of the bolt holes to prevent oil leakage. NOTE: You must assemble the housings within do in 5 minutes after applying the liquid gasket. If not, the sealing surface must be cleaned, and the liquid gasket reapplied. Allow it to cure at least 30 minutes after assembly before filling the differential with fluid. Remove the overflowing liquid gasket, when joining side case.
26. Install the dowel pins (A), the differential housing assembly (B), and the six mounting bolts (C).
27. Tighten the six mounting bolts in a crisscross pattern in several steps.
28. Install the 83 mm shim (A), the bearing set plate (B), and the six mounting bolts (C). NOTE: Install the bearing set plate, check to identification marks (D).
29. Tighten the six mounting bolts in a crisscross pattern in several steps.
30. Remove the dirt and oil from the sealing surfaces. Apply liquid gasket (P/N 08718-0001) to the sealing surface. Make sure you seal the entire circumference of the bolt holes to prevent oil leakage. NOTE: You must assemble the housings with you do in 5 minutes after applying the liquid gasket. If not, the sealing surface must be cleaned, and the liquid gasket reapplied. Allow it to cure at least 30 minutes after assembly before filling the differential with fluid.
31. Install the 8 x 12 mm dowel pins (A), the rear differential right side case (B), the rear differential left side case (C), and the mounting bolts (D).
32. Tighten the mounting bolts in a crisscross pattern in several steps.
33. Install the rear differential fluid temperature sensor (A), new O-ring (B), rear differential harness bracket (C), and rear differential fluid temperature sensor cover (D) with bolts.
34. Install the rear differential front mounting brackets (A) from the rear differential (B). NOTE: Install a lower surface of the guides (C) horizontally as shown, then tighten the new rear differential front mounting bracket bolts (D).
35. Install the rear differential (see «REAR DIFFERENTIAL INSTALLATION»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).
36. Refill the differential fluid (see «REAR DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).

Side Case Oil Seal Replacement

Special Tools Required

1. Oil seal driver A070AD-STK0110
2. Oil seal driver B 070AD-STK0120
3. Fork seal driver weight 07747-0010100

Scheme 141

Scheme 142

Scheme 143

Scheme 144

1. Remove the rear differential (see «REAR DIFFERENTIAL REMOVAL»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).
2. Remove the 40 x 55 x 7.5 mm dust seal (A) with a commercially available tool.
3. Remove the thrust washer.
4. Cut a slit at each position (4 place, 90 degrees apart) (A) on the 34.7 x 54 x 9 mm oil seal (B), then install 6 mm screw (C) (P/N 93901-16580) into the oil seal at each location. Remove the oil seal with pliers (D) and screw driver (E) as shown. NOTE: Do not thread the 6 mm screws into the oil seal more than 5 mm (0.197 in.).
5. Install the new 34.7 x 54 x 9 mm oil seal (A) into the rear differential side case (B) with the fork seal driver weight (C) and oil seal driver A (D).
6. Install the thrust washer (A), then install the new 40 x 55 x 7.5 mm dust seal (B) with the fork seal driver weight (C) and oil seal driver B (D).
7. Install the rear differential (see «REAR DIFFERENTIAL INSTALLATION»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).

Scheme 145

Scheme 146

Scheme 147

Scheme 148

Scheme 149

Scheme 150

Scheme 151

1. Remove the rear differential (see «REAR DIFFERENTIAL REMOVAL»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).
2. Remove the rear differential front mounting brackets (A) from the rear differential (B).
3. Remove the rear differential fluid temperature sensor cover (A), rear differential fluid temperature sensor (B), O-ring (C), and rear differential harness bracket (D) with bolts.
4. Remove the rear differential left side case (A), the rear differential right side case (B), the 10x12 mm dowel pins (C) from the rear differential center case (D).
5. Replace the rear differential center case.
6. Remove the dirt and oil from the sealing surfaces. Apply liquid gasket (P/N 08718-0001) to the sealing surface. Make sure you seal the entire circumference of the bolt holes to prevent oil leakage. NOTE: You must assemble the housings with you do in 5 minutes after applying the liquid gasket. If not, the sealing surface must be cleaned, and the liquid gasket reapplied. Allow it to cure at least 30 minutes after assembly before filling the differential with fluid.
7. Install the 8x12 mm dowel pins (A), the rear differential right side case (B), the rear differential left side case (C), and the mounting bolts (D) on to the rear differential center case (E).
8. Tighten the mounting bolts in a crisscross pattern in several steps.
9. Install the rear differential fluid temperature sensor (A), new O-ring (B), rear differential harness bracket (C), and rear differential fluid temperature sensor cover (D) with bolts.
10. Install the rear differential front mounting brackets (A) from the rear differential (B). NOTE: Install a lower surface of the guides (C) horizontally as shown, then tighten the new rear differential front mounting bracket bolts (D).
11. Install the rear differential (see «REAR DIFFERENTIAL INSTALLATION»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).
12. Refill the differential fluid (see «REAR DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).

Scheme 152

Scheme 153

Scheme 154

Scheme 155

Scheme 156

Scheme 157

Scheme 158

Scheme 159

Scheme 160

Scheme 161

Scheme 162

Scheme 163

Scheme 164

Scheme 165

Scheme 166

Scheme 167

Scheme 168

1. Remove the rear differential (see «REAR DIFFERENTIAL REMOVAL»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).
2. Remove the rear differential front mounting brackets (A) from the rear differential (B).
3. Remove the rear differential fluid temperature sensor cover (A), rear differential fluid temperature sensor (B), O-ring (C), and rear differential harness bracket (D) with bolts.
4. Remove the rear differential left side case (A) or the rear differential right side case (B), the 10x12 mm dowel pins (C) from the rear differential center case (D).
5. Replace the rear differential left side case or the differential right side case.
6. Remove the ring gear (A), needle bearing (B), and the 60.2 mm shim (C) from the rear differential side case (D).
7. Measure distance © between the end of the rear differential side case (A) and 60.2 mm shim contact area of planetary gear (B) with a straight edge (C) and depth gauge (D). Measure at three locations, and average the reading. NOTE: Carry out the measurement at normal room temperature. Clean all the parts thoroughly before measure.
8. Measure distance (D between the end of the rear differential center case (A) and ring gear contact area of taper roller bearing (B) with a straight edge (C) and depth gauge (D). Measure at three locations, and average the reading. NOTE: Carry out the measurement at normal room temperature. Clean all the parts thoroughly before measure.
9. Measure the distance (3) between the needle bearing (A) and tapper roller bearing contact area of ring gear (B) with a depth gauge (C). Measure at three locations, and average the reading. NOTE: Carry out the measurement at normal room temperature. Clean all the parts thoroughly before measure. Shim Selection Formula
10. Select the proper 60.2 mm shim from the table. Follow the example below, and use the measurements you made in steps 7 to 9 . (Basic Formula) (1)+(2)-(3) + 0.19) = shim thickness 0.19 mm (0.007 in.): middle of the clearance standard. Clearance Standard: 0.14-0.24 mm (0.006-0.009 in.) (For example) (1) = 6.12 mm (0.241 in.) (2) = 15.3 mm (0.602 in.) (3) = 19.5 mm (0.770 in.) 6.12 + 15.3 - (19.5 + 0.19) = 1.73 mm Select the 1.70 mm shim from the table. 60.2 mm shim SHIM THICKNESS CHART No. Part Number Thickness A 48701-RWG-000 1.10 mm (0.043 in.) B 48702-RWG-000 1.20 mm (0.047 in.) C 48703-RWG-000 1.30 mm (0.051 in.) D 48704-RWG-000 1.40 mm (0.055 in.) E 48705-RWG-000 1.50 mm (0.059 in.) F 48706-RWG-000 1.60 mm (0.063 in.) G 48707-RWG-000 1.70 mm (0.067 in.) H 487Q8-RWG-000 1.80 mm (0.071 in.) I 48709-RWG-000 1.90 mm (0.075 in.) J 48710-RWG-000 2.00 mm (0.079 in.) K 48711-RWG-000 2.10 mm (0.083 in.) L 48712-RWG-000 2.20 mm (0.087 in.)
11. Place one strip of plastigage (A) on 60.2 mm shim contact area of planetary gear (B). Install the 60.2 mm shim (C), needle bearing (D), and the ring gear (E). Measure at three locations, and average the reading. NOTE: Carry out the measurement at normal room temperature. Clean all the parts thoroughly before measure.
12. Install the 8x12 mm dowel pins (A), the rear differential right side case (B) or the rear differential left side case (C) and the mounting bolts (D).
13. Tighten the mounting bolts in a crisscross pattern in several steps.
14. Remove the rear differential left side case (A) or the rear differential right side case (B), the 10x12 mm dowel pins (C) from the rear differential center case (D).
15. Remove the ring gear (A), needle bearing (B), and the 60.2 mm shim (C) from the rear differential side case (D).
16. Measure the widest part of the plastigage.
17. If the clearance is more than the standard, go to step 7 . If the clearance measured in step 16 is within the standard, go to step 18.
18. Install the 60.2 mm shim (A), needle bearing (B), and the ring gear (C) onto the rear differential side case (D).
19. Remove the dirt and oil from the sealing surfaces. Apply liquid gasket (P/N 08718-0001) to the sealing surface. Make sure you seal the entire circumference of the bolt holes to prevent oil leakage. NOTE: You must assemble the housings within do in 5 minutes after applying the liquid gasket. If not, the sealing surface must be cleaned, and the liquid gasket reapplied. Allow it to cure at least 30 minutes after assembly before filling the differential with fluid.
20. Install the 8x12 mm dowel pins (A), the rear differential right side case (B) or the rear differential left side case (C), and the mounting bolts (D) onto the rear differential center case (E).
21. Tighten the mounting bolts in a crisscross pattern in several steps.
22. Install the rear differential fluid temperature sensor (A), new O-ring (B), rear differential harness bracket (C), and rear differential fluid temperature sensor cover (D) with bolts.
23. Install the rear differential front mounting brackets (A) from the rear differential (B). NOTE: Install a lower surface of the guides (C) horizontally as shown, then tighten the new rear differential front mounting bracket bolts (D).
24. Install the rear differential (see «REAR DIFFERENTIAL INSTALLATION»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).
25. Refill the differential fluid (see «REAR DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ).
26. Do the SH-AWD differential clutch torque memorization (see «SH-AWD Differential Clutch Torque Memorization»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-differential-clutch-torque-memorization)

See also:
• TRIM REMOVAL/INSTALLATION - REAR SIDE AREA
• TRIM REMOVAL/INSTALLATION - CARGO AREA
• DLC CIRCUIT TROUBLESHOOTING
• STEERING ANGLE SENSOR CENTER POINT WRITING
• WHEEL ALIGNMENT
• POWER RELAY TEST
• BRAKE SYSTEM INSPECTION AND TEST
• BATTERY TEST
• TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A
• REAR DRIVESHAFT REMOVAL
• REAR DRIVESHAFT INSTALLATION
• DTC TROUBLESHOOTING
• SH-AWD Control Unit Initialization
• SH-AWD Differential Clutch Torque Memorization
• YAW RATE-LATERAL/LONGITUDINAL ACCELERATION NEUTRAL POSITION MEMORIZATION
• 12-1
• 15-1
• 16-3
• 33-2
• 41-1
• 41-2
• 41-4
• 41-5
• 41-6
• 42-1
• 42-2
• 43-1
• 44-11
• 44-12
• 44-32
• 44-41
• 44-50
• 49-1
• 52-3
• 53-1
• 53-2
• 56-3
• 57-1
• 57-2
• 77-1
• 77-2
• 77-4
• 77-5
• 77-6
• 78-xx
• 81-1
• 82-1
• 91-1
• THE SH-AWD INDICATOR DOES NOT GO OFF, AND NO DTCS ARE STORED
• THE SH-AWD INDICATOR DOES NOT COME ON
• UPDATING THE SH-AWD CONTROL UNIT
• SH-AWD Control Unit Replacement
• SH-AWD Function Test