Rear Differential Acura ZDX I

Scheme 1

Scheme 2

SH-AWD Indicator

The SH-AWD indicator will come 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 volts.

After the SH-AWD indicator comes on, it stays on until you turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

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 SH-AWD units EEPROM (non-volatile memory). Therefore, the memorized DTCs are not cleared when the battery is disconnected or when 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. Refer to the «SYMPTOM TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) .

Self-Diagnosis

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

1. Turns the SH-AWD indicator on.
2. Memorizes the DTC if possible.
3. Stops AWD control and puts the vehicle back into two-wheel drive (front wheel only).
4. Reduces engine torque to suit the driving conditions when an abnormality was detected (The client may notice a decrease in engine performance).

Scheme 3

1. With the ignition switch in LOCK (0), or the vehicle in the OFF mode, connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__dlc-circuit-troubleshooting) ).
4. Check the diagnostic trouble code (DTC) and the freeze data, for all systems in the vehicle, troubleshoot the powertrain DTCs first and note them. Then refer to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) , and do the appropriate troubleshooting procedure. NOTE: The HDS can read the DTC, the freeze data, the current data, and other system data. For specific operations, refer to the Help menu that came with the HDS. It is best do an ALL DTC CHECK to look for other systems DTCs that are related to the problem.

Scheme 4

1. With the ignition switch in LOCK (0), or the vehicle in the OFF mode, connect the HDS to the DLC (A) located under the Driver's side of the dashboard.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__dlc-circuit-troubleshooting) ).
4. Clear the DTC(s) by following the screen prompts on the HDS.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode. NOTE: If the DTC that was cleared is related to another system, that system's DTC must be repaired, or the SH-AWD DTC will return.

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 control module will usually come on, and the malfunction indicator lamp (MIL), the D indicator, the VSA indicator, and/or the ABS indicator may also come on.

Note. Check the vehicle battery condition and charging system before troubleshooting.

Scheme 5

1. With the ignition switch in LOCK (0), or the vehicle in the OFF mode, connect the HDS to the data link connector (DLC) (A) located under the Driver's side of the dashboard.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__dlc-circuit-troubleshooting) ). Follow the prompts on the HDS to display the DTC(s) on the screen. Check the DTC and the freeze data for all systems. After determining the DTC(s), refer to the «DTC TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NOTE: See the HDS help menu for specific instructions.
3. If there are fuel and emissions DTCs and other system DTCs at the same time, troubleshoot the fuel and emissions DTCs first, otherwise the SH-AWD DTC may return.
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/zdx/i-2009-2013/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 (2)

Scheme 6

Scheme 7

1. Remove the rear side trim panel (see «TRIM REMOVAL/INSTALLATION - REAR SIDE AREA»(/acura/zdx/i-2009-2013/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-rear-side-area) ).
2. Remove the SH-AWD control unit (A).
3. Inspect the circuit on the SH-AWD control unit according to the DTC Troubleshooting using the backprobe set and a digital multimeter or an analog circuit tester.
4. Connect the backprobe adapters (A) to the stacking patch cords (B), and connect the cords to a digital multimeter or an analog circuit tester (C). 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.

SH-AWD® Control Unit Update

Special Tools Required

1. Honda Diagnostic System (HDS)
2. Honda Interface Module (HIM)
3. HDS pocket tester
4. MVCI unit with the latest control module (CM) update software installed

Note. Before you update the SH-AWD control unit, make sure the battery in the vehicle is fully charged. 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. Never turn the ignition switch to ACC (I) or LOCK (0), or press the engine start/stop button to select the ACC or OFF mode during the update. If there is a problem with the update, leave the ignition switch in ON (II), or the vehicle in the ON mode, otherwise the control unit could be damaged, or it will set DTCs. 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 the same program it already has installed. It will only accept a new program. If you need to diagnose the Honda interface module (HIM) because the HIM's red (#3) light came on or was flashed during the update, leave the ignition switch in the ON (II) position, or the engine start/stop button in the ON mode, when you disconnect the HIM from the data link connector (DLC). This will prevent SH-AWD control unit damage.

Scheme 8

1. With the ignition switch in LOCK (0), or the vehicle in the OFF mode, connect the HDS/HIM to the DLC (A) located under the Driver's side of the dashboard.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__dlc-circuit-troubleshooting) ).
4. Select the update program, and follow the screen prompts to update the SH-AWD control unit.
5. 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.
6. Do the SH-AWD control unit initialization (see «SH-AWD® CONTROL UNIT INITIALIZATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-initialization) ).
7. Do the SH-AWD differential clutch torque memorization (see «SH-AWD® DIFFERENTIAL CLUTCH TORQUE MEMORIZATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-differential-clutch-torque-memorization) ).
8. Do the yaw rate-acceleration neutral position memorization (see «YAW RATE-ACCELERATION NEUTRAL POSITION MEMORIZATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__yaw-rate-acceleration-neutral-position-memorization) ).

SH-AWD® Differential Clutch Torque Memorization

Whenever the right or left clutch side case is replaced, the differential clutch torque memorization must be done.

Scheme 9

1. With the ignition switch in LOCK (0), or the vehicle in the OFF mode, connect the HDS to the DLC (A) located under the Driver's side of the dashboard.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__dlc-circuit-troubleshooting) ).
4. From the mode menu, select SH-AWD, select MISCELLANEOUS TEST, select NEUTRAL MENU, then select DIFFERENTIAL TORQUE with the HDS, and follow the screen prompts. NOTE: See the HDS help menu for specific instructions.

Yaw Rate-Acceleration Neutral Position Memorization

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

Scheme 10

1. With the ignition switch in LOCK (0), or the vehicle in the OFF mode, connect the HDS to the DLC (A) located under the Driver's side of the dashboard.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__dlc-circuit-troubleshooting) ).
4. From the mode menu, select SH-AWD, select MISCELLANEOUS TEST, select NEUTRAL MENU, then select ALL SENSORS with the HDS, and follow the screen prompts. NOTE: See the HDS help menu for specific instructions.

SH-AWD® Control Unit Initialization

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

Scheme 11

1. With the ignition switch in LOCK (0), or the vehicle in the OFF mode, connect the HDS to the DLC (A) located under the Driver's side of the dashboard.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__dlc-circuit-troubleshooting) ).
4. From the mode menu, select SH-AWD, select MISCELLANEOUS TEST, then select INITIALIZATION with the HDS, and follow the screen prompts. NOTE: See the HDS help menu for specific instructions.

DTC Troubleshooting Index

Symptom Troubleshooting Index

Note. Most problems in the SH-AWD unit can 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.

Outline

This vehicle is equipped with a Super Handling All-Wheel Drive* (SH-AWD*) rear differential system. This system uses the 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

In a normal turn, the radius of the front wheels is shorter than the radius that the rear wheels travel. If the front and rear wheels are driven at the same speed, full power is not transmitted. The SH-AWD system monitors the speed of the front wheels and increases the speed of the outside rear wheel proportionally around the larger radius. This improves stability and steering response. On slippery surfaces, this provides the improved traction of a 4-wheel drive system.

Scheme 12

Scheme 13

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 an 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 the rear differential. The control units exchange information via the 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 control module, 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 and 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 14

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.

Scheme 15

The SH-AWD control unit receives inputs from the PCM and the VSA modulator-control unit on the driving conditions via the 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 16

Search Coil Detection System

As the clutch discs wear, the air gap between the pressure guides and the multi-plate clutches decrease. The decrease 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 17

Scheme 18

SH-AWD Control Unit Inputs and Outputs

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

Scheme 19

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

Scheme 20

Scheme 21

Scheme 22

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), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn the ignition switch back to ON (II), or select the OFF mode, then the ON mode.
4. Check for DTCs in the VSA system with the HDS. Are any yaw rate-acceleration sensor DTCs indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Go to step 5.
5. Check for DTCs with the HDS. Is DTC 12-1, 12-2, or 12-3 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. 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 LATERAL ACCELERATION SENSOR in the SH-AWD mode menu DATA LIST with the HDS. Does the sensor value change when turning? YES -Go to step 7. NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
7. Park the vehicle on a level surface.
8. Check the LATERAL ACCELERATION SENSOR in the SH-AWD mode menu DATA LIST with the HDS. Is there 0.1 G or less? YES -Go to step 9. NO -Do the yaw rate-acceleration neutral position memorization (see «YAW RATE-ACCELERATION NEUTRAL POSITION MEMORIZATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__yaw-rate-acceleration-neutral-position-memorization) ), and recheck.
9. Check the LATERAL ACCELERATION SENSOR in the VSA DATA LIST with the HDS. Is there 0.1 G or less? YES -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Replace the yaw rate-acceleration sensor (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__yaw-rate-acceleration-sensor-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), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Test-drive the vehicle for 2 minutes in a vehicle speed is kept constant at 19 mph (30 km/h).
4. Check for DTCs in the VSA system with the HDS. Are any yaw rate-acceleration sensor DTCs indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Go to step 5.
5. Check for DTCs with the HDS. Is DTC 15-1 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Test-drive the vehicle with an assistant. When accelerating, check the LONGITUDINAL ACCELERATION SENSOR in the SH-AWD mode menu DATA LIST with the HDS. Does the sensor value change when acceleration? YES -Go to step 7. NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
7. Park the vehicle on a level surface.
8. Check the LONGITUDINAL ACCELERATION SENSOR in the SH-AWD mode menu DATA LIST with the HDS. Is there 0.1 G or less? YES -Go to step 9. NO -Do the yaw rate-acceleration neutral position memorization (see «YAW RATE-ACCELERATION NEUTRAL POSITION MEMORIZATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__yaw-rate-acceleration-neutral-position-memorization) ), and recheck.
9. Check the LONGITUDINAL ACCELERATION SENSOR in the VSA DATA LIST with the HDS. Is there 0.1 G or less? YES -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Replace the yaw rate-acceleration sensor (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__yaw-rate-acceleration-sensor-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), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Test-drive the vehicle for 2 minutes in a straight line at 19 mph (30 km/h) or more.
4. Check for DTCs in the VSA system with the HDS. Are any steering angle sensor DTCs indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Go to step 5.
5. Check for DTCs with the HDS. Is DTC 16-3 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Start the engine.
7. Check the STEERING ANGLE SENSOR in the SH-AWD mode menu DATA LIST with the HDS. When the steering wheel is turned slowly, does the sensor value change? YES -Go to step 8. NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
8. Test-drive the vehicle in a straight line at 19 mph (30 km/h) or more.
9. Park the vehicle on a level surface, and center the steering wheel.
10. Check the STEERING ANGLE SENSOR in the SH-AWD mode menu DATA LIST with the HDS. Is it within ±25 deg of center? YES -Go to step 11. NO -Do the VSA sensor neutral position memorization to relearn the steering angle sensor center point (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__yaw-rate-acceleration-sensor-replacement) ), and recheck.
11. Check the STEERING ANGLE SENSOR in the VSA DATA LIST with the HDS. Is it within ±25 deg of center? YES -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Replace the steering angle Sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__steering-angle-sensor-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), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn the ignition switch back to ON (II), or select the OFF mode, then the ON mode.
4. Check for DTCs in the VSA system with the HDS. Are any yaw rate-acceleration sensor DTCs indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Go to step 5.
5. Check for DTCs with the HDS. Is DTC 33-2 or 33-3 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. 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 SH-AWD mode menu DATA LIST with the HDS. Does the sensor value change when turning? YES -Go to step 7. NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
7. Park the vehicle on a level surface.
8. Check the YAW RATE SENSOR in the SH-AWD mode menu DATA LIST with the HDS. Is there 3.5 deg/s or less? YES -Go to step 9. NO -Do the yaw rate-acceleration neutral position memorization (see «YAW RATE-ACCELERATION NEUTRAL POSITION MEMORIZATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__yaw-rate-acceleration-neutral-position-memorization) ), and recheck.
9. Check the YAW RATE SENSOR in the VSA DATA LIST with the HDS. Is there 3.5 deg/s or less? YES -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Replace the yaw rate-acceleration sensor (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__yaw-rate-acceleration-sensor-replacement) ).

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

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

Scheme 23

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for DTCs in the PGM-FI system with the HDS. Are there any PGM-FI system DTCs indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Go to step 5.
5. Check for DTCs with the HDS. Is DTC 41-1 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for an intermittent open between SH-AWD control unit connector terminals A10 and A20 and PCM connector terminals A48 and A49.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Jump the SCS line with the HDS. NOTE: This step must be done to prevent PCM damage.
8. Disconnect PCM connector A (49P).
9. Disconnect SH-AWD control unit connector A (20P).
10. Check for continuity between PCM connector terminals A48, A49 and SH-AWD control unit connector terminals A10, A20 respectively. Is there continuity? YES -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair an open in the wires between the SH-AWD control unit and the PCM.

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

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

Scheme 24

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for DTCs in the PGM-FI system with the HDS. Are there any PGM-FI system DTCs indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Go to step 5.
5. Check for DTCs with the HDS. Is DTC 41-2 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for an 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.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Disconnect the VSA modulator-control unit 46P connector.
8. Disconnect SH-AWD control unit connector A (20P).
9. Check for continuity between VSA modulator-control unit 46P connector terminals No. 38, No. 39 and SH-AWD control unit connector terminals A10, A20 respectively. Is there continuity? YES -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair an 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 System)

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

Scheme 25

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for DTCs in the A/T system with the HDS. Are there any A/T system DTCs indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Go to step 5.
5. Check for DTCs with the HDS. Is DTC 41-4 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for an intermittent open between SH-AWD control unit connector terminals A10 and A20 and PCM connector terminals A48 and A49.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Jump the SCS line with the HDS. NOTE: This step must be done to prevent PCM damage.
8. Disconnect PCM connector A (49P).
9. Disconnect SH-AWD control unit connector A (20P).
10. Check for continuity between PCM connector terminals A48, A49 and SH-AWD control unit connector terminals A10, A20 respectively. Is there continuity? YES -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair an open in the wires between the SH-AWD control unit and the PCM.

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

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

Scheme 26

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for DTCs in the VSA system with the HDS. Are any yaw rate-acceleration sensor DTCs of F-CAN indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Go to step 5.
5. Check for DTCs with the HDS. Is DTC 41-5 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for an intermittent open between SH-AWD control unit connector terminals A10 and A20 and yaw rate-acceleration sensor 4P connector terminals No. 2 and No. 3.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Disconnect the yaw rate-acceleration sensor 4P connector.
8. Disconnect SH-AWD control unit connector A (20P).
9. Check for continuity between yaw rate-acceleration sensor 4P connector terminals No. 2, No. 3 and SH-AWD control unit connector terminals A10, A20 respectively. Is there continuity? YES -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair an open in the wire between the SH-AWD control unit and the yaw rate-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 27

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine.
4. 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 «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Go to step 5.
5. Check for DTCs with the HDS. Is DTC 41-6 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for an intermittent open between SH-AWD control unit connector terminals A10 and A20 and steering angle sensor 5P connector terminals No. 2 and No. 4.1
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Disconnect the steering angle sensor 5P connector.
8. Disconnect SH-AWD control unit connector A (20P).
9. Check for continuity between steering angle sensor 5P connector terminals No. 2, No. 4 and SH-AWD control unit connector terminals A10, A20 respectively. Is there continuity? YES -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair an 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 was driven prior to this troubleshooting procedure, allow the rear differential to cool for more than an hour before continuing.

Scheme 28

Scheme 29

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn the ignition switch back to ON (II), or select the OFF mode, then the ON mode.
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), or press the engine start/stop button to select the OFF mode.
6. Disconnect the rear differential fluid temperature sensor 2P connector.
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
8. Check the REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR in the DATA LIST with the HDS. Is the sensor reading 0 V? YES -Replace the rear differential fluid temperature sensor (see «REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ). NO -Go to step 9.
9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Disconnect SH-AWD control unit connector A (20P).
11. Check for continuity between rear differential fluid temperature sensor 2P connector terminals No. 1 and No. 2. Is there continuity? YES -Repair a short in the wire between rear differential fluid temperature sensor 2P connector terminals No. 1 and No. 2. NO -Go to step 12.
12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
13. Measure the voltage between body ground and rear differential fluid temperature sensor 2P connector terminals No. 1 and No. 2 respectively. Is there about 5 V or more? YES -Repair a short to power in the wire harness. NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

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

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

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

Scheme 36

1. Raise and support the vehicle, and allow all four wheels to rotate freely (see «LIFT AND SUPPORT POINTS»(/acura/zdx/i-2009-2013/remont/oem-general-information/#general-information__lift-and-support-points) ).
2. Start the engine and turn the VSA off (the VSA OFF lamp in the gauge control module turns on). Run the engine until the vehicle speed reaches 35 mph (56 km/h) and maintain the speed for 10 minutes, then slow down and stop the wheels.
3. Turn the ignition switch to LOCK (0), then turn the ignition switch back to ON (II), or select the OFF mode, then the ON mode.
4. Clear the DTC with the HDS.
5. Check for DTCs with the HDS. Is DTC 42-2 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Disconnect the rear differential fluid temperature sensor 2P connector.
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Measure the voltage between rear differential fluid temperature sensor 2P connector terminals No. 1 and No. 2. Is there 4 V or more? YES -Replace the rear differential fluid temperature sensor (see «REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ). NO -Go to step 10.
10. Measure the voltage between rear differential fluid temperature sensor 2P connector terminal No. 1 and body ground. Is there 4 V or more? YES -Go to step 15 . NO -Go to step 11.
11. Measure the voltage between SH-AWD control unit connector terminal A8 and body ground. Is there about 4 V? YES -Repair an open in the wire between SH-AWD control unit connector terminal A8 and rear differential fluid temperature sensor 2P connector terminal No. 1. NO -Go to step 12.
12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
13. Disconnect SH-AWD control unit connector A (20P).
14. Check for continuity between rear differential fluid temperature sensor 2P connector terminal No. 1 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between SH-AWD control unit connector terminal A8 and the rear differential fluid temperature sensor 2P connector. NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
15. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
16. Disconnect SH-AWD control unit connector A (20P).
17. Check for continuity between rear differential fluid temperature sensor 2P connector terminal No. 2 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between SH-AWD control unit connector terminal A18 and the rear differential fluid temperature sensor 2P connector. NO -Go to step 18.
18. Connect SH-AWD control unit connector terminal A18 to body ground with a jumper wire.
19. Check for continuity between rear differential fluid temperature sensor 2P connector terminal No. 2 and body ground. Is there continuity? YES -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair an open in the wire between SH-AWD control unit connector terminal A18 and the rear differential fluid temperature sensor 2P connector.

DTC 43-1: Differential Fluid Temperature Sensor Malfunction

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

Scheme 37

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check for DTCs with the HDS. Is DTC 42-1 or 42-2 indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Start the engine, and let it idle for 1 minute.
5. Test-drive the vehicle for 5 minutes.
6. Check for DTCs with the HDS. Is DTC 43-1 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time.
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Disconnect SH-AWD control unit connector A (20P) and the rear differential fluid temperature sensor 2P connector.
9. Check for continuity between rear differential fluid temperature sensor 2P connector terminals No. 1 and No. 2. Is there continuity? YES -Repair a short in the wires between rear differential fluid temperature sensor 2P connector terminals No. 1 and No. 2.1 NO -Go to step 10.
10. Reconnect all connectors.
11. Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
12. Start the engine, and let it idle for 1 minute.
13. 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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ). NO -Replace the original SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn the ignition switch back to ON (II), or select the OFF mode, then the ON mode.
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 «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/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 38

Scheme 39

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for DTCs with the HDS. Is DTC 44-12 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Remove the SH-AWD relay (see «SH-AWD® RELAY REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ), then test the SH-AWD relay (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). Is the SH-AWD relay OK? YES -Go to step 7. NO -Replace the SH-AWD relay (see «SH-AWD® RELAY REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).
7. Disconnect SH-AWD control unit connector A (20P).
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Measure the voltage between SH-AWD control unit connector terminal A17 and body ground with the SH-AWD relay removed. Is there battery voltage? YES -Repair a short to power in the wire between the SH-AWD control unit connector terminal A17 and the SH-AWD relay (FSR line). NO -Go to step 10.
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
11. Disconnect SH-AWD control unit connector B (8P).
12. Measure the voltage between SH-AWD control unit connector terminals B1 and B2. Is there battery voltage? YES -Repair a 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 «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 44-32: SH-AWD Control Unit Power Supply Stuck ON; 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), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for DTCs with the HDS. Is DTC 44-32 or 44-41 indicated? YES -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/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 ). Make sure the battery is fully charged and the charging system is working properly.

Scheme 40

Scheme 41

Scheme 42

Scheme 43

Scheme 44

Scheme 45

1. Check the No. 5 (30 A) fuse in the auxiliary under-hood fuse/relay box. Is the fuse OK? YES -Go to step 2. NO -Replace the blown fuse and recheck. If the No. 5 (30 A) fuse blows again, repair a short to ground in the wire between the No. 5 (30 A) fuse in the auxiliary under-hood fuse/relay box and the SH-AWD relay 4P connector, then replace the fuse and recheck.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Clear the DTC with the HDS.
4. Start the engine.
5. Check for DTCs with the HDS. Is DTC 44-50 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Remove the SH-AWD relay (see «SH-AWD® RELAY REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ), then test the SH-AWD relay (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/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® RELAY REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).
8. Measure the voltage between SH-AWD relay 4P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 9. NO -Repair an open in the wire between the No. 5 (30 A) fuse in the auxiliary under-hood fuse/relay box and the SH-AWD relay 4P connector.
9. Disconnect SH-AWD control unit connector A (20P) and connector B (8P).
10. Connect SH-AWD relay 4P connector terminals No. 1 and No. 2 with a jumper wire.
11. Measure the voltage between SH-AWD control unit connector terminal B1 and body ground. Is there voltage? YES -Go to step 12. NO -Repair an open in the wire between SH-AWD control unit connector terminal B1 and the SH-AWD relay 4P connector.
12. Check for continuity between SH-AWD relay 4P connector terminal No. 3 and body ground. Is there continuity? YES -Go to step 13. NO -Repair an open in the wire between the SH-AWD relay 4P connector and body ground (G601) (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/zdx/i-2009-2013/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), or repair poor body ground (G601).
13. Connect SH-AWD relay 4P connector terminals No. 3 and No. 4 with a jumper wire.
14. Check for continuity between SH-AWD control unit connector terminal A17 and body ground. Is there continuity? YES -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 «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair an open in the wire between SH-AWD control unit connector terminal A17 and the SH-AWD relay 4P connector.

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

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

Scheme 46

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine.
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. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect SH-AWD control unit connector B (8P).
7. Check for continuity between SH-AWD control unit connector terminal B2 and body ground. Is there continuity? YES -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Repair an open in the wire between SH-AWD control unit connector terminal B2 and body ground (G604) (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/zdx/i-2009-2013/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), or repair poor body ground (G604).

DTC 52-3: Left Clutch Electromagnetic Coil Current Malfunction

Note. Before you troubleshoot, review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If DTC 49-1 is stored at the same time as DTC 52-3, troubleshoot DTC 49-1 first, then recheck for DTC 52-3.

Scheme 47

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Do the clutch function test with the HDS (see «SH-AWD® FUNCTION TEST»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-function-test) ).
4. Check for DTCs with the HDS. Is DTC 52-3 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect SH-AWD control unit connector B (8P) and the left solenoid 4P connector.
7. Connect left solenoid 4P connector terminal No. 1 to body ground with a jumper wire.
8. Check for continuity between SH-AWD control unit connector terminal B5 and body ground. Is there continuity? YES -Go to step 9. NO -Repair an open in the wire between the SH-AWD control unit connector terminal B5 and the left solenoid 4P connector.
9. Remove the jumper wire from left solenoid 4P connector terminal No. 1.
10. Connect left solenoid 4P connector terminal No. 2 to body ground with a jumper wire.
11. Check for continuity between SH-AWD control unit connector terminal B4 and body ground. Is there continuity? YES -Go to step 12. NO -Repair an open in the wire between SH-AWD control unit connector terminal B4 and the left solenoid 4P connector.
12. Remove the jumper wire from left solenoid 4P connector terminal No. 2.
13. Check for continuity between SH-AWD control unit connector terminal B2 and body ground. Is there continuity? YES -Go to step 14. NO -Repair an open in the wire between SH-AWD control unit connector terminal B2 and body ground (G604) (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/zdx/i-2009-2013/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), or repair poor body ground (G604).
14. Check for continuity between SH-AWD control unit connector terminals B2 and B4. Is there continuity? YES -Repair a short to body ground in the wire between SH-AWD control unit connector terminal B4 and the left solenoid 4P connector. NO -Go to step 15.
15. Check for continuity between SH-AWD control unit connector terminals B2 and B5. Is there continuity? YES -Repair a short to body ground in the wire between SH-AWD control unit connector terminal B5 and the left solenoid 4P connector. NO -Go to step 16.
16. Check for continuity between SH-AWD control unit connector terminals B4 and B5. Is there continuity? YES -Repair a short in the wires between the SH-AWD control unit and the left solenoid 4P connector. NO -Go to step 17.
17. Measure the voltage between SH-AWD control unit connector terminals B2 and B5. Is there voltage? YES -Repair a short to power in the wire between SH-AWD control unit connector terminal B5 and the left solenoid 4P connector. NO -Go to step 18.
18. Measure the voltage between SH-AWD control unit connector terminals B2 and B4. Is there voltage? YES -Repair a short to power in the wire between SH-AWD control unit connector terminal B4 and the left solenoid 4P connector. NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 53-1, 53-3: Left Clutch Electromagnetic Coil (Open)

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

Scheme 57

Scheme 58

Scheme 59

Scheme 60

Scheme 61

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Do the clutch function test with the HDS (see «SH-AWD® FUNCTION TEST»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-function-test) ).
4. Check for DTCs with the HDS. Is DTC 53-1 or 53-3 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect SH-AWD control unit connector B (8P) and the left solenoid 4P connector.
7. Connect left solenoid 4P connector terminal No. 1 to body ground with a jumper wire.
8. Check for continuity between SH-AWD control unit connector terminal B5 and body ground. Is there continuity? YES -Go to step 9. NO -Repair an open in the wire between SH-AWD control unit connector terminal B5 and the left solenoid 4P connector.
9. Remove the jumper wire from left solenoid 4P connector terminal No. 1.
10. Connect left solenoid 4P connector terminal No. 2 to body ground with a jumper wire.
11. Check for continuity between SH-AWD control unit connector terminal B4 and body ground. Is there continuity? YES -Go to step 12. NO -Repair an open in the wire between SH-AWD control unit connector terminal B4 and the left solenoid 4P connector.
12. Remove the jumper wire from left solenoid 4P Connector terminal No. 2.
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
15. Check the REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR in the SH-AWD mode menu DATA LIST. The temperature should be 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).
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
17. Disconnect the left solenoid 4P connector.
18. Measure the resistance between left solenoid 4P connector terminals No. 1 and No. 2. Is there 1.8 ohms or more? YES -Replace the rear differential left side case (see «SIDE CASE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ). NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/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 62

Scheme 63

Scheme 64

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Do the clutch function test with the HDS (see «SH-AWD® FUNCTION TEST»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-function-test) ).
4. Check for DTCs with the HDS. Is DTC 53-2 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect SH-AWD control unit connector B (8P) and the left solenoid 4P connector.
7. Check for continuity between SH-AWD control unit connector terminals B4 and B5. Is there continuity? YES -Repair a short in the wires between SH-AWD control unit connector terminals B4 and B5. NO -Go to step 8.
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Measure the voltage between SH-AWD control unit connector terminal B4 and body ground. Is there voltage? YES -Repair a short to power in the wires between SH-AWD control unit connector terminal B4 and the left solenoid 4P connector. NO -Go to step 10.
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
11. Reconnect all connectors.
12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
13. Check the REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR in the SH-AWD mode menu DATA LIST. The temperature should be above 68°F (20°C) with the HDS before proceeding to the next step. If the temperature is below 68°F (20 CC), drive the vehicle to warm up the rear differential until the fluid temperature becomes above 68°F (20°C).
14. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
15. Disconnect the left solenoid 4P connector.
16. Measure the resistance between left solenoid 4P connector terminals No. 1 and No. 2. Is there 0.45 ohms or less? YES -Replace the rear differential left side case (see «SIDE CASE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ). NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/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 ). If DTC 49-1 is stored at the same time as DTC 56-3, troubleshoot DTC 49-1 first, then recheck for DTC 56-3.

Scheme 65

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Scheme 73

Scheme 74

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Do the clutch function test with the HDS (see «SH-AWD® FUNCTION TEST»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-function-test) ).
4. Check for DTCs with the HDS. Is DTC 56-3 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect SH-AWD control unit connector B (8P) and the right solenoid 4P connector.
7. Connect right solenoid 4P connector terminal No. 1 to body ground with a jumper wire.
8. Check for continuity between SH-AWD control unit connector terminal B7 and body ground. Is there continuity? YES -Go to step 9. NO -Repair an open in the wire between SH-AWD control unit connector terminal B7 and the right solenoid 4P connector.
9. Remove the jumper wire from right solenoid 4P connector terminal No. 1.
10. Connect right solenoid 4P connector terminal No. 2 to body ground with a jumper wire.
11. Check for continuity between SH-AWD control unit connector terminal B6 and body ground. Is there continuity? YES -Go to step 12. NO -Repair an open in the wire between SH-AWD control unit connector terminal B6 and the right solenoid 4P connector.
12. Remove the jumper wire from right solenoid 4P connector terminal No. 2.
13. Check for continuity between SH-AWD control unit connector terminal B2 and body ground. Is there continuity? YES -Go to step 14. NO -Repair an open in the wire between SH-AWD control unit connector terminal B2 and body ground (G604) (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/zdx/i-2009-2013/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), or repair poor body ground (G604).
14. Check for continuity between SH-AWD control unit connector terminals B2 and B6. Is there continuity? YES -Repair a short to body ground in the wire between SH-AWD control unit connector terminal B6 and the right solenoid 4P connector. NO -Go to step 15.
15. Check for continuity between SH-AWD control unit connector terminals B2 and B7. Is there continuity? YES -Repair a short to body ground in the wire between SH-AWD control unit connector terminal B7 and the right solenoid 4P connector. NO -Go to step 16.
16. Check for continuity between SH-AWD control unit connector terminals B6 and B7. Is there continuity? YES -Repair a short in the wires between the SH-AWD control unit and the right solenoid 4P connector. NO -Go to step 17.
17. Measure the voltage between SH-AWD control unit connector terminals B2 and B7. Is there voltage? YES -Repair a short to power in the wire between the SH-AWD control unit connector terminal B7 and the right solenoid 4P connector. NO -Go to step 18.
18. Measure the voltage between SH-AWD control unit connector terminals B2 and B6. Is there voltage? YES -Repair a short to power in the wire between SH-AWD control unit connector terminal B6 and the right solenoid 4P connector. NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 57-1, 57-3: Right Clutch Electromagnetic Coil (Open)

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

Scheme 75

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Scheme 78

Scheme 79

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Do the clutch function test with the HDS (see «SH-AWD® FUNCTION TEST»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-function-test) ).
4. Check for DTCs with the HDS. Is DTC 57-1 or 57-3 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect SH-AWD control unit connector B (8P) and the right solenoid 4P connector.
7. Connect right solenoid 4P connector terminal No. 1 to body ground with a jumper wire.
8. Check for continuity between SH-AWD control unit connector terminal B7 and body ground. Is there continuity? YES -Go to step 9. NO -Repair an open in the wire between SH-AWD control unit connector terminal B7 and the right solenoid 4P connector.
9. Remove the jumper wire from right solenoid 4P connector terminal No. 1.
10. Connect right solenoid 4P connector terminal No. 2 to body ground with a jumper wire.
11. Check for continuity between SH-AWD control unit connector terminal B6 and body ground. Is there continuity? YES -Go to step 12. NO -Repair an open in the wire between SH-AWD control unit connector terminal B6 and the right solenoid 4P connector.
12. Remove the jumper wire from right solenoid 4P connector terminal No. 2.
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
15. Check the REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR in the SH-AWD mode menu DATA LIST. The temperature should be 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).
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
17. Disconnect the right solenoid 4P connector.
18. Measure the resistance between right solenoid 4P connector terminals No. 1 and No. 2. Is there 1.8 ohms or more? YES -Replace the rear differential right side case (see «SIDE CASE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ). NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/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 ).

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Scheme 82

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Do the clutch function test with the HDS (see «SH-AWD® FUNCTION TEST»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-function-test) ).
4. Check for DTCs with the HDS. Is DTC 57-2 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect SH-AWD control unit connector B (8P) and the right solenoid 4P connector.
7. Check for continuity between SH-AWD control unit connector terminals B6 and B7. Is there continuity? YES -Repair a short in the wires between SH-AWD control unit connector terminals B6 and B7. ™ NO -Go to step 8.
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Measure the voltage between SH-AWD control unit connector terminal B6 and body ground. Is there voltage? YES -Repair a short to power in the wires between SH-AWD control unit connector terminal B6 and the right clutch electromagnetic coil. NO -Go to step 10.
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
11. Reconnect all connectors.
12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
13. Check the REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR in the SH-AWD mode menu DATA LIST. The temperature should be 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).
14. Turn the ignition switch to LOCK (0), or press the # engine start/stop button to select the OFF mode.
15. Disconnect the right solenoid 4P connector.
16. Measure the resistance between right solenoid 4P connector terminals No. 1 and No. 2. Is there 0.45 ohms or less? YES -Replace the rear differential right side case (see «SIDE CASE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ). NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/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 is low, refill it, clear the DTC, and recheck.

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check for DTCs in the VSA system with the HDS. Are any VSA system DTCs indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Start the engine.
5. Test-drive the vehicle at 10 mph (15 km/h), and 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 6.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. 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 «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Inspect and repair the rear brakes (see «SYMPTOM TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system) ).

DTC 77-1: The Functional Abnormalities of Fuel and Emissions or Automatic Transmission

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

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for DTCs with the HDS. Is DTC 77-1 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Check for DTCs in the PGM-FI system with the HDS. Are there any PGM-FI system DTCs indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 77-2: The Functional Abnormalities of VSA Modulator-Control Unit; DTC 77-5: Yaw Rate-Acceleration Sensor Malfunction; 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), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for DTCs with the HDS. Is DTC 77-2, 77-5, or 77-6 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Check for DTCs in the VSA system with the HDS. Are there VSA system DTCs indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).

DTC 77-4: Communication Error with Automatic Transmission

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

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for DTCs with the HDS. Is DTC 77-4 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Check for DTCs in the A/T system with the HDS. Are there any A/T system DTCs indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/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. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine.
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 «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/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 ).

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Scheme 90

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Disconnect SH-AWD control unit connector A (20P).
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 12 .
4. Check the REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR in the SH-AWD mode menu DATA LIST. The temperature should be 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 the resistance between SH-AWD control unit connector terminals A1 and A11. Is there about 2.0 ohms or more? YES -Go to step 8 . NO -Go to step 6.
6. Disconnect the left solenoid 4P connector.
7. Check for continuity between left solenoid 4P connector terminals No. 3 and No. 4. Is there continuity? YES -Repair a short in the wires between SH-AWD control unit connector A and the left solenoid 4P connector. NO -Replace the rear differential left side case (see «SIDE CASE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).
8. Check for continuity between SH-AWD control unit connector terminal A1 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between SH-AWD control unit connector terminal A1 and body ground. NO -Go to step 9.
9. Check the connections at the SH-AWD control unit. Are the connections loose or poor? YES -Repair the connections as needed, and recheck. NO -Go to step 10.
10. Update the SH-AWD control unit with the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), and recheck. Does the symptom/indication go away? YES -Troubleshooting is complete. NO -Go to step 11.
11. Substitute the SH-AWD control unit with a known-good control unit, and recheck. Does the symptom/indication go away? YES -Replace the original SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Replace the rear differential left side case (see «SIDE CASE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ). NOTE: If a new SH-AWD control unit was used in place of the known-good control unit and the new control unit will not initialize, replace the rear differential left side case (see «SIDE CASE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).
12. Disconnect the left solenoid 4P connector.
13. Connect left solenoid 4P connector terminal No. 3 to body ground with a jumper wire.
14. Check for continuity between SH-AWD control unit connector terminal A11 and body ground. Is there continuity? YES -Go to step 15. NO -Repair an open in the wire between SH-AWD control unit connector terminal A11 and the left solenoid 4P connector.
15. Remove the jumper wire from left solenoid 4P connector terminal No. 3.
16. Connect left solenoid 4P connector terminal No. 4 to body ground with a jumper wire.
17. Check for continuity between SH-AWD control unit connector terminal A1 and body ground. Is there continuity? YES -Replace the rear differential left side case (see «SIDE CASE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ). NO -Repair an open in the wire between SH-AWD control unit connector terminal A1 and the left solenoid 4P connector.

DTC 82-1: Right Search Coil Sensor Malfunction

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

Scheme 91

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Scheme 98

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Disconnect SH-AWD control unit connector A (20P).
3. Check for continuity between SH-AWD control unit connector terminals A3 and A12. Is there continuity? YES -Go to step 4. NO -Go to step 12 .
4. Check the REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR in the SH-AWD mode menu DATA LIST. The temperature should be 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 the resistance between SH-AWD control unit connector terminals A3 and A12. Is there about 2.0 ohms or more? YES -Go to step 6. NO -Go to step 10 .
6. Disconnect the right solenoid 4P connector.
7. Check for continuity between right solenoid 4P connector terminals No. 3 and No. 4. Is there continuity? YES -Repair a short in the wires between SH-AWD control unit connector A and the right solenoid 4P connector. NO -Replace the rear differential right side case (see «SIDE CASE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).
8. Check for continuity between SH-AWD control unit connector terminal A3 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between SH-AWD control unit connector terminal A3 and body ground. NO -Go to step 9.
9. Check the connections at the SH-AWD control unit. Are the connections loose or poor? YES -Repair the connections as needed, and recheck. NO -Go to step 10.
10. Update the SH-AWD control unit with the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), and recheck. Does the symptom/indication go away? YES -Troubleshooting is complete. NO -Go to step 11.
11. Substitute the SH-AWD control unit with a known-good control unit, and recheck. Does the symptom/indication go away? YES -Replace the original SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Replace the rear differential right side case (see «SIDE CASE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ). NOTE: If a new SH-AWD control unit was used in place of the known-good control unit and the new control unit will not initialize, replace the rear differential right side case (see «SIDE CASE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).
12. Disconnect the right solenoid 4P connector.
13. Connect right solenoid 4P connector terminal No. 3 to body ground with a jumper wire.
14. Check for continuity between SH-AWD control unit connector terminal A12 and body ground. Is there continuity? YES -Go to step 15. NO -Repair an open in the wire between SH-AWD control unit connector terminal A12 and the right solenoid 4P connector.
15. Remove the jumper wire from right solenoid 4P connector terminal No. 3.
16. Connect right solenoid 4P connector terminal No. 4 to body ground with a jumper wire.
17. Check for continuity between SH-AWD control unit connector terminal A3 and body ground. Is there continuity? YES -Replace the rear differential right side case (see «SIDE CASE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ). NO -Repair an open in the wire between SH-AWD control unit connector terminal A3 and the right solenoid 4P connector.

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 to ACC (I) or LOCK (0), or press the engine start/stop button to select the ACC or OFF mode while updating the SH-AWD system. If you do, the SH-AWD system can be damaged.

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Do the SH-AWD system update procedure (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ).
3. Check for DTCs with the HDS. Is DTC 91-1 indicated? YES -Substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ), and recheck. 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/zdx/i-2009-2013/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. 5 (30 A) fuse in the auxiliary under-hood fuse/relay box is OK. Make sure there are no loose connector terminals at the SH-AWD control unit. Make sure the charging system and the battery are OK. Make sure the PCM is not in the middle of updating.

1. Test the battery (see «BATTERY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#battery) ). Charge or replace the battery if necessary.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Check the COMPLETE MEMORIZATION in the DATA LIST with the HDS. Does the data list show "complete"? YES -Go to step 4. NO -Do the SH-AWD system memorization procedure for each of the following, then go to step 4. SH-AWD differential clutch torque (see «SH-AWD® DIFFERENTIAL CLUTCH TORQUE MEMORIZATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-differential-clutch-torque-memorization) ) Yaw rate-acceleration neutral position (see «YAW RATE-ACCELERATION NEUTRAL POSITION MEMORIZATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__yaw-rate-acceleration-neutral-position-memorization) ) SH-AWD control unit initialization (see «SH-AWD® CONTROL UNIT INITIALIZATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-initialization) )
4. Check for DTCs in the VSA system with the HDS. Are any steering angle sensor DTCs indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) . NO -Go to step 5.
5. Start the engine.
6. Check the SH-AWD indicator value with the HDS. Is the SH-AWD indicator value OFF? YES -Go to the gauge control self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#gauges__self-diagnostic-function) ). NO -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/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), or press the engine start/stop button to select the ON mode.
2. 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 3.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect SH-AWD control unit connector A (20P) and connector B (8P).
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. 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 «SH-AWD® CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Go to the gauge control self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#gauges__self-diagnostic-function) ).

SH-AWD® Function Test

Special Tools Required

Torque Wrench Adapter 070AJ-SJAA101

Direct Electromagnetic Clutch Test

Note. Before doing the SH-AWD Function Test, check the following conditions.

1. Check to make sure there are no DTC detected.
2. The shift lever is in P.
3. The SH-AWD control unit has been initialized.

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Scheme 101

1. With the ignition switch in LOCK (0), or the vehicle in the OFF mode, connect the HDS to the DLC (A) located under the Driver's side of the dashboard.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__dlc-circuit-troubleshooting) ).
4. 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.
5. Raise and support the vehicle (see «LIFT AND SUPPORT POINTS»(/acura/zdx/i-2009-2013/remont/oem-general-information/#general-information__lift-and-support-points) ).
6. Remove the rear wheels.
7. Install the torque wrench adapter (A) on the rear wheel hub.
8. Do the Direct Electromagnetic Clutch Test with the HDS.
9. Install a torque wrench on the torque wrench adapter as shown in illustration. Write down the torque value with the HDS while slowly rotating the rear hub with the torque wrench as shown in illustration. (Turn the hub no more than 90 degrees in 7 to 10 seconds). NOTE: Use a torque wrench capable of measuring up to 785 N.m (80.0 kgf.m, 579 lbf.ft) such as a commercially available Snap-on torque wrench TEC602A.
10. 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 cases (see «SIDE CASE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).

Scheme 102

1. Park the vehicle on level ground, and turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Use solvent and a brush to wash any oil and dirt off the differential fluid filler plug, and dry them with compressed air.
3. Remove the filler plug (A) and the sealing washer (B), then check the condition of the fluid, if the fluid is dirty or burnt, replace it.
4. Make sure the fluid is at the proper level (C). If the level is below the proper level, check for fluid leaks at the differential. If a problem is found, fix it before filling the differential with fluid.
5. The fluid level must reach up the bottom of the filler plug hole. If necessary, add the recommended fluid until it runs out, then reinstall the filler plug with a new sealing washer.

Scheme 103

Scheme 104

1. Park the vehicle on level ground, and turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Remove the filler plug (A) and the sealing washer (B).
3. Remove the drain plug (C) and the sealing washer (D), and drain the fluid.
4. Reinstall the drain plug with a new sealing washer.
5. Refill the recommended fluid until it reaches the bottom of the filler plug hole. Fluid Capacity: 2.53 L (2.67 US qt) at fluid change 2.77 L (2.93 US qt) at overhaul Recommended fluid: Acura All-Wheel Drive Fluid (DPSF)
6. Reinstall the filler plug with a new sealing washer.
7. If the Maintenance Minder required to replace the rear differential fluid, reset the Maintenance Minder (see «MAINTENANCE MINDER™»(/acura/zdx/i-2009-2013/remont/schedule/#maintenance) ), and this procedure is complete. If the Maintenance Minder did not require to replace the rear differential fluid, go to step 8.
8. With the ignition switch in LOCK (0), or the vehicle in the OFF mode, connect the HDS to the DLC (A) located under the Driver's side of the dashboard.
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
10. Make sure the HDS communicates with the vehicle and the PCM. If it does not communicate, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__dlc-circuit-troubleshooting) ).
11. Select GAUGES in the BODY ELECTRICAL with the HDS.
12. Select ADJUSTMENT in the GAUGES with the HDS.
13. Select MAINTENANCE MINDER in the ADJUSTMENT with the HDS.
14. Select RESET in the MAINTENANCE MINDER with the HDS.
15. Select MAINTENANCE SUB ITEM 6 RESET with the HDS, and reset the rear differential fluid life.

Scheme 105

1. Drain the rear differential fluid, and reinstall the drain plug with a new sealing washer (see «REAR DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).
2. Remove the rear differential fluid temperature sensor cover (A) and rear differential harness bracket D, then disconnect the rear differential fluid temperature sensor 2P connector (B).
3. Remove the rear differential fluid temperature sensor (C).
4. Install the rear differential fluid temperature sensor with a new O-ring (E) in the reverse order of removal.
5. Refill the rear differential with the recommended fluid (see «REAR DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).

SH-AWD Control Unit Replacement

Note. The SH-AWD control unit must be initialized after replacement, otherwise the SH-AWD system will not function.

Scheme 106

1. Remove the rear side trim panel (see «TRIM REMOVAL/INSTALLATION - REAR SIDE AREA»(/acura/zdx/i-2009-2013/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-rear-side-area) ).
2. Remove the SH-AWD control unit (A).
3. Disconnect the SH-AWD control unit connectors (B).
4. Install the SH-AWD control unit in the reverse order of removal.
5. Do the SH-AWD control unit initialization (see «SH-AWD® CONTROL UNIT INITIALIZATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-initialization) ).

Scheme 107

1. Remove the Driver's dashboard undercover (see «Driver's DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#dashboard) ).
2. Remove the SH-AWD relay (A).
3. Install the SH-AWD relay in the reverse order of removal.

Scheme 108

Scheme 109

Scheme 110

Scheme 111

Scheme 112

1. Raise and support the vehicle (see «LIFT AND SUPPORT POINTS»(/acura/zdx/i-2009-2013/remont/oem-general-information/#general-information__lift-and-support-points) ).
2. Disconnect the breather hose (A) from the breather pipe (B), then remove the clip (C).
3. Disconnect the breather hose (A) from the breather end (B) on the rear subframe, then remove the clips (C).
4. Remove the breather hoses (A) from the clamps (B) on the body.
5. Disconnect the breather hoses (A) from the breather box (B), then remove the breather box from the body.

Installation

Note. Apply a light coat of Acura All-Wheel Drive Fluid (DPSF) to the connect area of the breather hose before installation.

Scheme 113

Scheme 114

Scheme 115

Scheme 116

1. Install the breather box (A) on the body, then connect the breather hoses (B) to the breather box.
2. Install the breather hoses (A) to the clamps (B) at the paint marks (C).
3. Connect the breather hose (A) to the breather end (B), and install the clips (C) to the body and the rear subframe.
4. Connect the breather hose (A) to the breather pipe (B), and install the clip (D) to rear differential harness bracket C.

Special Tools Required

Driveshaft Remover 07AAD-S3VA000

Scheme 117

Scheme 118

Scheme 119

Scheme 120

Scheme 121

Scheme 122

Scheme 123

Scheme 124

1. Raise and support the vehicle (see «LIFT AND SUPPORT POINTS»(/acura/zdx/i-2009-2013/remont/oem-general-information/#general-information__lift-and-support-points) ).
2. Drain the rear differential fluid (see «REAR DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).
3. Remove the rear wheels.
4. Remove the lower arm A mounting bolts (A) and the lower arm B mounting bolts (B).
5. Disconnect the inboard joints (A) from the rear differential (B) using the driveshaft remover (C) and a hammer.
6. Pull the knuckle (A) outward, and separate the rear driveshaft inboard joints (B) from the rear differential.
7. Make reference mark (A) across the No. 2 propeller shaft (B) and the rear differential companion flange (C). Separate the No. 2 propeller shaft from the rear differential. NOTE: Suspend the propeller shaft with an appropriate size nylon strap.
8. Remove the spare tire.
9. Place a transmission jack (A) under the rear differential (B).
10. Remove the rear differential rear mount bolts (C) and the rear differential front mounting bracket bolts (D).
11. Slightly lower the rear differential on the transmission jack. NOTE: Make sure you do not over extend the wire harness and the breather hose.
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. Slightly lower the rear differential on the transmission jack.
15. Disconnect the right solenoid 4P connector (A) and the rear differential fluid temperature sensor 2P connector (B), then remove the clips (C).
16. Disconnect the breather hose (D) from the breather pipe (E).
17. Lower the rear differential on the transmission jack.
18. Remove the set rings (A) from the rear differential.

Scheme 125

Scheme 126

Scheme 127

Scheme 128

Scheme 129

Scheme 130

Scheme 131

1. Place the rear differential on a transmission jack.
2. Install new set rings (A) into the groove (B) of the rear differential.
3. Raise the rear differential to the appropriate position 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 hose (A) to the breather pipe (B).
8. Connect the right solenoid 4P connector (C) and the rear differential fluid temperature sensor 2P connector (D), then install the clips (E).
9. Raise the rear differential to the mounting level.
10. Temporarily install the rear differential front mounting bracket bolts (A).
11. Loosen the rear differential front mounting bolts (B).
12. Install the new rear differential rear mount bolts (C and D) and tighten them to the specified torque in the sequence shown in illustration.
13. Replace the rear differential front mounting bolts and tighten them to the specified torque.
14. Tighten the rear differential front mounting bracket bolts to the specified torque.
15. Attach the No. 2 propeller shaft (A) to the rear differential companion flange (B) by aligning the reference mark (C) you made during the removal procedure.
16. Apply appropriate grease to the rear driveshaft inboard joints (see «REAR DRIVESHAFT INSTALLATION»(/acura/zdx/i-2009-2013/remont/axle-shafts/#drivelineaxle__rear-driveshaft-installation) ).
17. Pull the knuckle outward, and insert the rear driveshaft inboard joints (A) into the rear differential (B).
18. Loosely install the new lower arm A mounting bolts (A) and the new lower arm B mounting bolts (B).
19. Place a floor jack under the lower arm, and raise the suspension to load it with the vehicle's weight.
20. Tighten the lower arm A mounting bolts and the lower arm B mounting bolts to the specified torque, then remove the floor jack.
21. Install the rear wheels.
22. Install the spare tire.
23. Refill the rear differential with the recommended fluid (see «REAR DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).
24. Check the wheel alignment, and adjust it if necessary (see «WHEEL ALIGNMENT»(/acura/zdx/i-2009-2013/remont/wheel-alignment/#front-and-rear-suspension-inspection__wheel-alignment) ).
25. Test-drive the vehicle.

Scheme 132

Side Case Oil Seal Replacement

Special Tools Required

1. Driver Handle 07AAD-STKA100
2. Oil Seal Driver 07AAD-STKA111
3. Dust Seal Driver 07AAD-STKA120

Scheme 133

Scheme 134

Scheme 135

Scheme 136

1. Remove the rear differential (see «REAR DIFFERENTIAL REMOVAL»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).
2. Remove the 40 x 55 x 7.5 mm dust seal (A) using a commercially available tool. NOTE: Remove the dust seal with care so you do not damage the inside surface of the side case seal surface.
3. Remove the thrust washer.
4. To remove the 34.7 x 54 x 9 mm oil seal (A), install the 6 mm screw (B) (P/N 93901-16580) into the maintenance hole (C) of the oil seal as shown in illustration; the oil seal has four invisible places on the surface for maintenance (4 places, 90 degrees apart). Remove the oil seal using pliers (D) and a screw driver (E) as shown in illustration. NOTE: Do not thread the 6 mm screw into the oil seal more than 5 mm (0.20 in).
5. Install a new 34.7 x 54 x 9 mm oil seal (A) into the rear differential side case (B) using the oil seal driver (C) and the driver handle (D).
6. Install the thrust washer (A), then install a new 40 x 55 x 7.5 mm dust seal (B) using the dust seal driver (C) and the driver handle (D).
7. Install the rear differential (see «REAR DIFFERENTIAL INSTALLATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).

Scheme 137

Scheme 138

Scheme 139

Scheme 140

Scheme 141

Scheme 142

Scheme 143

1. Remove the rear differential (see «REAR DIFFERENTIAL REMOVAL»(/acura/zdx/i-2009-2013/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), the rear differential fluid temperature sensor (B), and the O-ring (C).
4. Remove rear differential harness bracket D.
5. Remove the rear differential left side case (A), the rear differential right side case (B), and the 10x12 mm dowel pins (C) from the rear differential center case (D).
6. Replace the rear differential center case.
7. Remove the dirt and oil from the sealing surfaces. Apply liquid gasket (P/N 08717-0004, 08718-0001, 08718-0003, 08718-0004, or 08718-0009) to the sealing surface. Make sure you seal up to the inside edge of the bolt holes to prevent oil leakage. NOTE: You must assemble the housings within 5 minutes after applying the liquid gasket. If you applied liquid gasket P/N 08718-0012, the component must be installed within 4 minutes. If not, the sealing surface must be cleaned, and the liquid gasket reapplied. Allow the liquid gasket to cure at least 30 minutes after assembly before filling the differential with fluid.
8. Install the 10 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) onto the rear differential center case (E).
9. Tighten the mounting bolts in a crisscross pattern in several steps, then tighten the bolts to the specified torque.
10. Install rear differential harness bracket D.
11. Install the rear differential fluid temperature sensor (A) with a new O-ring (B), and install the rear differential fluid temperature sensor cover (C).
12. Temporarily install the rear differential front mounting brackets (A) with new bolts (B) on the rear differential (C).
13. Install the rear differential (see «REAR DIFFERENTIAL INSTALLATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).

Scheme 144

Scheme 145

Scheme 146

Scheme 147

Scheme 148

Scheme 149

Scheme 150

Scheme 151

Scheme 152

Scheme 153

Scheme 154

Scheme 155

Scheme 156

Scheme 157

Scheme 158

Scheme 159

Scheme 160

1. Remove the rear differential (see «REAR DIFFERENTIAL REMOVAL»(/acura/zdx/i-2009-2013/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), the rear differential fluid temperature sensor (B), and the O-ring (C).
4. Remove rear differential harness bracket D.
5. Remove the rear differential left side case (A) or the rear differential right side case (D), and the 10x12 mm dowel pins (E) from the rear differential center case (F).
6. Remove rear differential harness bracket B and rear differential harness bracket C.
7. Replace the rear differential left side case or the rear differential right side case.
8. Remove the ring gear (A), the needle bearing (B), and the 60.2 mm shim (C) from the rear differential side case (D).
9. Measure the distance (1) between the end of the rear differential side case (A) and the 60.2 mm shim contact area (B) of the planetary gear with a straight edge (C) and a depth gauge (D). Measure at three locations, and average the reading. NOTE: Carry out the measurement at normal room temperature. Clean the parts thoroughly before measure.
10. Measure the distance (2) between the end of the rear differential center case (A) and the ring gear contact area (B) of the taper roller bearing with a straight edge (C) and a depth gauge (D). Measure at three locations, and average the reading. NOTE: Carry out the measurement at normal room temperature. Clean the parts thoroughly before measure.
11. Measure the distance (3) between the needle bearing (A) and the taper roller bearing contact area (B) of ring gear with a depth gauge (C). Measure at three locations, and average the reading. NOTE: Carry out the measurement at normal room temperature. Clean the parts thoroughly before measure. Shim Selection Formula
12. Select the proper 60.2 mm shim from the table. Follow the example below, and use the measurements you made in step 9 to 11 . (Basic Formula) (1) + (2) - ((3) + 0.19)=shim thickness 0.19 mm (0.0075 in): middle of the standard clearance. Standard Clearance: 0.14-0.24 mm (0.0055-0.0094 in) (For example) (1)=6.12 mm (0.2409 in) (2)=15.3 mm (0.6024 in) (3)=19.56 mm (0.7701 in) 6.12 + 15.3 - (19.56 + 0.19) = 1.67 mm Select the 1.60 mm shim from the table. 60.2 MM SHIM No. Thickness A 1.10 mm (0.0433 in) B 1.20 mm (0.0472 in) C 1.30 mm (0.0512 in) D 1.40 mm (0.0551 in) E 1.50 mm (0.0591 in) F 1.60 mm (0.0630 in) G 1.70 mm (0.0669 in) H 1.80 mm (0.0709 in) I 1.90 mm (0.0748 in) J 2.00 mm (0.0787 in) K 2.10 mm (0.0827 in) L 2.20 mm (0.0866 in)
13. Place one strip of plastigage (A) on the 60.2 mm shim contact area (B) of planetary gear. Install the 60.2 mm shim (C), the needle bearing (D), and the ring gear (E). Measure at three locations as shown in illustration. NOTE: Carry out the measurement at normal room temperature. Clean the parts thoroughly before measure.
14. Install the 10x12 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).
15. Tighten the mounting bolts in a crisscross pattern in several steps, then tighten the bolts to the specified torque.
16. Remove the rear differential left side case (A) or the rear differential right side case (B), and the 10 x 12 mm dowel pins (C) from the rear differential center case (D).
17. Remove the ring gear (A), the needle bearing (B), and the 60.2 mm shim (C) from the rear differential side case (D).
18. Measure the widest part of the plastigage. Measure at three locations, and average the reading. If the clearance exceeds the standard, go to step 8 . If the clearance is within the standard, go to step 19. Standard Clearance: 0.14-0.24 mm (0.0055-0.0094 in)
19. Install the 60.2 mm shim (A), the needle bearing (B), and the ring gear (C) onto the rear differential side case (D).
20. Remove the dirt and oil from the sealing surfaces. Apply liquid gasket (P/N 08717-0004, 08718-0001, 08718-0003, 08718-0004, or 08718-0009) to the sealing surface. Make sure you seal up to the inside edge of the bolt holes to prevent oil leakage. NOTE: You must assemble the housings within 5 minutes after applying the liquid gasket. If you applied liquid gasket P/N 08718-0012, the component must be installed within 4 minutes. If not, the sealing surface must be cleaned, and the liquid gasket reapplied. Allow the liquid gasket to cure at least 30 minutes after assembly before filling the differential with fluid.
21. Install the 10 x 12 mm dowel pins (A), the rear differential right side case (D) or the rear differential left side case (E), and the mounting bolts (F) onto the rear differential center case (G).
22. Install rear differential harness bracket B and rear differential harness bracket C.
23. Tighten the mounting bolts in a crisscross pattern in several steps, then tighten the bolts to the specified torque.
24. Install rear differential harness bracket D.
25. Install the rear differential fluid temperature sensor (A) with a new O-ring (B), and install the rear differential fluid temperature sensor cover (C).
26. Temporarily install the rear differential front mounting brackets (A) with new bolts (B) on the rear differential (C).
27. Install the rear differential (see «REAR DIFFERENTIAL INSTALLATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential) ).
28. Do the SH-AWD differential clutch torque memorization (see «SH-AWD® DIFFERENTIAL CLUTCH TORQUE MEMORIZATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-differential-clutch-torque-memorization) ).

See also:
• DLC CIRCUIT TROUBLESHOOTING
• TRIM REMOVAL/INSTALLATION - REAR SIDE AREA
• YAW RATE-ACCELERATION SENSOR REPLACEMENT
• WHEEL ALIGNMENT
• STEERING ANGLE SENSOR REPLACEMENT
• LIFT AND SUPPORT POINTS
• POWER RELAY TEST
• CONNECTOR TO FUSE/RELAY BOX INDEX
• SYMPTOM TROUBLESHOOTING
• BATTERY TEST
• SELF-DIAGNOSTIC FUNCTION
• MAINTENANCE MINDER™
• Driver's DASHBOARD UNDERCOVER REMOVAL/INSTALLATION
• REAR DRIVESHAFT INSTALLATION
• SYMPTOM TROUBLESHOOTING
• SH-AWD® CONTROL UNIT INITIALIZATION
• SH-AWD® DIFFERENTIAL CLUTCH TORQUE MEMORIZATION
• YAW RATE-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
• 44-50
• 49-1
• 52-3
• 53-1
• 53-2
• 56-3
• 57-1
• 57-2
• 77-1
• 77-2
• 77-4
• 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
• SIDE CASE OIL SEAL REPLACEMENT
• SH-AWD® CONTROL UNIT UPDATE
• SH-AWD CONTROL UNIT REPLACEMENT
• SH-AWD® FUNCTION TEST