Vsa System Components Acura ZDX I

Scheme 1

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System Indicator

This system has four indicators

Scheme 3

1. ABS indicator (A)
2. Brake system indicator (B)
3. VSA indicator (C)
4. VSA OFF indicator (D)
5. USA / Canada models I models

When the system detects a problem, it will turn the appropriate indicators on. Depending on the failure, the VSA modulator-control unit determines which indicators are turned on.

When the system is OK, each indicator comes on for about 2 seconds after turning the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, then goes off.

ABS Indicator

The ABS indicator comes on when the ABS function is lost. The brakes still work like a conventional system.

Brake System Indicator

The brake system indicator comes on when the EBD (Electronic Brake Distribution) function is lost, the parking brake is applied, and/or the brake fluid level is low.

Note. If two or more wheel speed sensors fail, the brake system indicator will come on.

VSA Indicator

The VSA indicator comes on when the VSA function is lost. The VSA indicator blinks when the VSA function is activating.

VSA OFF Indicator

The VSA OFF indicator comes on, when the VSA is turned OFF by using the VSA OFF switch, or VSA sensor neutral position is not memorized.

ABS and VSA Indicators go off

Each indicator will go off after a problem goes away, but the timing which the VSA modulator-control unit turns off the indicators varies between DTCs.

1. DTC 61, 62: The indicators go off automatically when the system returns to normal.
2. DTC 11, 13, 15, 17, 25, 65, 81, 84, 86, 113, or 158: The indicators stay on until the ignition switch is turned to LOCK (0), or when pressing the engine start/stop button to select the OFF mode, whether or not the system returns to normal.
3. DTC 12, 14, 16, 18, 21, 22, 23, 24, 26, 27, 28, 31, 32, 33, 34, 35, 36, 37, 38, 51, 52, 53, 54, 66, 68, 83, 88, 91, 121, 122, 123, 124, 131, 132, 133, 134, 135, 136, 137, or 138

The indicators stay on until the vehicle is driven after the system returns to normal.

Diagnostic Trouble Code (DTC)

1. The memory can hold up to 10 DTCs. However, when the same DTC is detected more than once, the more recent DTC is written over the earlier one. Therefore, when the same problem is detected repeatedly, it is memorized as a single DTC.
2. The DTCs are memorized in an EEPROM in the VSA modulator-control unit. Therefore, the memorized DTCs cannot be erased by disconnecting the battery. Do the specified procedures to clear the DTCs.

Self-Diagnosis

1. Self-diagnosis can be classified into two categories: Initial diagnosis: Done right after the ignition switch is turned to ON (II), or the engine start/stop button is pressed to select the ON mode and until the ABS and VSA indicators go off. Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned to LOCK (0), or the engine start/stop button is pressed to select the OFF mode.
2. When the system detects a problem, the VSA modulator-control unit shifts to fail-safe mode.

Kickback

The pump motor operates when the VSA modulator-control unit is functioning, and the fluid in the modulator is forced out to the master cylinder, causing a kickback at the brake pedal.

Pump Motor

1. The pump motor operates when the VSA modulator-control unit is functioning.
2. The VSA modulator-control unit checks the pump motor operation during the first acceleration after the vehicle starts driving.

Brake Fluid Replacement/Air Bleeding

Brake fluid replacement and air bleeding procedures are identical to the procedures used on vehicles without the VSA system (see BRAKE SYSTEM BLEEDING ).

How to Troubleshoot DTCs

The troubleshooting procedures assume that the cause of the problem is still present, and the ABS and/or VSA indicator is still on. Following a troubleshooting procedure for a DTC that has been cleared but does not reset can result in incorrect diagnosis.

1. Question the client about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting. Find out when the ABS and/or VSA indicator came on, such as during activation, after activation, when the vehicle was traveling at a certain speed, etc. If necessary, have the client demonstrate the concern.
2. When the ABS and/or VSA indicators do not come on during the test-drive, but troubleshooting is done based on the DTC, check for loose connectors, poor contact of the terminals, etc. in the circuit indicated by the DTC.
3. After troubleshooting, or the repairs are done, clear the DTCs, and test-drive the vehicle under the same conditions that originally set the DTCs. Make sure the ABS and VSA indicators do not come on.

Intermittent Failures

The term "intermittent failure" means a system may have had a failure, but it checks OK now. If you cannot reproduce the condition, check for loose connections and terminals. Also check ground and power connections related to the circuit that you are troubleshooting.

How to Use the HDS (Honda Diagnostic System)

Note. Make sure the battery is in good condition and fully charged.

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1. If the system indicators stay on, 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.
3. Make sure the HDS communicates with the vehicle and the VSA modulator-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, troubleshoot the powertrain DTCs first. Then refer to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) , 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.

How to Retrieve DTCs

1. With the ignition switch in LOCK (0) or vehicle in OFF mode, connect the HDS to the data link connector (DLC) 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 VSA modulator-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. Follow the prompts on the HDS to display the DTC(s) on the screen. After determining the DTC, refer to the «DTC TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) . Do the all systems DTC check, and troubleshoot any powertrain DTCs first.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

How to Clear DTCs

1. With the ignition switch in LOCK (0) or vehicle in OFF mode, connect the HDS to the data link connector (DLC) 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 VSA modulator-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.

DTC Troubleshooting Index

Symptom Troubleshooting Index

When the vehicle has one of these symptoms, check for VSA diagnostic trouble codes (DTCs) with the HDS. If there are no DTCs, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.

Scheme 5

System Outline

This system is composed of the VSA modulator-control unit, the wheel speed sensors, the steering angle sensor, the yaw rate-acceleration sensor, and the system indicators in the gauge control module. The VSA modulator-control unit controls the Anti-Lock Brake System (ABS), the Electronic Brake Distribution (EBD), the Traction Control System (TCS), the Vehicle Stability Assist (VSA), the Hill Start Assist (HSA), and brake assist with the brake pressure of each wheel and reduces engine torque.

Scheme 6

Anti-Lock Control

Without ABS, when the brake pedal is pressed while driving, the wheels sometimes lock before the vehicle comes to a stop. In such an event, the maneuverability of the vehicle is reduced if the front wheels are locked, and the stability of the vehicle is reduced if the rear wheels are locked, creating an extremely unstable condition. With ABS, the system precisely controls the slip rate of the wheels to ensure maximum grip force from the tires, and it thereby ensures maneuverability and stability of the vehicle. The ABS calculates the slip rate of the wheels based on the four wheel speeds, and then it controls the brake fluid pressure to reach the target slip rate.

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Main Control

The control unit detects the wheel speed based on the wheel speed sensor signals it receives, then it calculates the vehicle speed based on the detected wheel speed. The control unit detects the vehicle speed during deceleration based on the wheel speeds.

The control unit calculates the slip rate of each wheel, and transmits the control signal to the modulator unit solenoid valve when the slip rate is high.

The hydraulic control has three modes: Pressure intensifying, pressure reducing, and pressure retaining.

Scheme 8

EBD (Electronic Brake Distribution) Features

The EBD feature helps control vehicle braking by adjusting the rear brake force in accordance with the rear wheel load before the ABS operates. Based on the wheel speed sensor signals, the control unit uses the modulator to control the rear brakes individually. When the rear wheel speed is less than the front wheel speed, the VSA modulator-control unit retains the current rear brake fluid pressure by closing the inlet valve in the modulator. As the rear wheel speed increases and approaches the front wheel speed, the VSA modulator-control unit increases the rear brake fluid pressure by momentarily opening the inlet valve. This whole process is repeated very rapidly. While this is happening, kickback may be felt at the brake pedal, you may also hear a muted buzzing sound from the VSA modulator-control unit. This is normal.

Scheme 9

TCS (Traction Control System) Features

When a drive wheel loses traction on a slippery road surface and starts to spin, the VSA modulator-control unit applies brake pressure to the spinning wheel and sends an engine torque control request to the PCM to slow the spinning wheel and keep traction.

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Oversteer Control

Applies the brakes to the front and rear outside wheels

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Scheme 12

1. Applies the brakes to the front and rear inside wheels
2. Controls the engine torque when accelerating

Brake Assist Features

Brake assist helps ensure that any driver can achieve the full braking potential of the vehicle by increasing brake system pressure in a panic situation, bringing the vehicle into a full ABS stop.

If during a panic stop the VSA modulator-control unit determines that the brake system pressure increases above a threshold in less than a certain amount of time, the VSA modulator-control unit engages brake assist.

Because the brake system pressure crossed the pressure threshold before the time threshold had expired, the VSA modulator-control unit goes into brake assist mode.

Scheme 13

Modulator Unit

The modulator unit consists of the inlet solenoid valve, the outlet solenoid valve, the VSA NO (normally open) solenoid valve, the VSA NC (normally closed) solenoid valve, the reservoir, the pump, the pump motor, and the damping chamber.

The hydraulic control has three modes of ABS action; pressure intensifying, pressure retaining, and pressure reducing. Pressure intensifying mode (VSA) is a combination of the TCS, VSA, and brake assist action.

The hydraulic circuit is an independent four channel type; one channel for each wheel.

Scheme 14

HSA (Hill Start Assist) Features

Prevents the vehicle from rolling backwards when moving your foot from the brake pedal to the accelerator pedal while stopped on a hill. The control unit reads the angle of inclination from the yaw rate-acceleration sensor, and that all four wheels are stopped, then it calculates the amount of fluid pressure required to keep the vehicle from rolling backward when the control unit sees the brake pressure decrease as the driver lifts their foot off of the brake pedal, and moves their foot to the accelerator pedal. The hill start assist also works when the vehicle is stopped on a downhill slope.

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DTC 11: Right-Front Wheel Speed Sensor Circuit Malfunction; DTC 13: Left-Front Wheel Speed Sensor Circuit Malfunction; DTC 15: Right-Rear Wheel Speed Sensor Circuit Malfunction; DTC 17: Left-Rear Wheel Speed Sensor Circuit Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

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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 88 indicated with DTC 11, 13, 15, or 17 at the same time? YES -Go to step 9 . NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
5. Check for DTCs with the HDS. Is DTC 11, 13, 15, or 17 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Check for loose terminals between the wheel speed sensor 2P connector and the VSA modulator-control unit 46P connector. Are their connections OK? YES -Go to step 8. NO -Repair the connector or terminals if possible, or replace the harness, and retest.
8. Check that the appropriate wheel speed sensor is properly mounted (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ). DTC Appropriate Wheel Speed Sensor 11 Right-front 13 Left-front 15 Right-rear 17 Left-rear Is the wheel speed sensor installation OK? YES -Go to step 10 . NO -Reinstall the wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ), then go to step 1 .
9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Disconnect the VSA modulator-control unit 46P connector (see step 4 ).
11. Start the engine.
12. Measure the voltage between body ground and the appropriate wheel speed sensor + B and GND terminals of the VSA modulator-control unit 46P connector individually (see table). DTC Appropriate Terminal +B GND 11 (Right-front) FR +B: No. 29 FR-GND: No. 28 13 (Left-front) FL +B: No. 12 FL-GND: No. 34 15 (Right-rear) RR +B: No. 30 RR-GND: No. 8 17 (Left-rear) RL +B: No. 11 RL-GND: No. 10 Is there 0.1 V or more? YES -Repair a short to power in the wire between the VSA modulator-control unit and the appropriate wheel speed sensor. NO -Go to step 13.
13. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
14. Check for continuity between body ground and the appropriate wheel speed sensor +B and GND terminals of the VSA modulator-control unit 46P connector individually (see table). DTC Appropriate Terminal +B GND 11 (Right-front) FR +B: No. 29 FR-GND: No. 28 13 (Left-front) FL +B: No. 12 FL-GND: No. 34 15 (Right-rear) RR +B: No. 30 RR-GND: No. 8 17 (Left-rear) RL +B: No. 11 RL-GND: No. 10 Is there continuity? YES -Go to step 15. NO -Go to step 17 .
15. Disconnect the appropriate wheel speed sensor 2P connector (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ).
16. Check for continuity between body ground and the appropriate wheel speed sensor +B and GND terminals of the VSA modulator-control unit 46P connector individually (see table). DTC Appropriate Terminal + B GND 11 (Right-front) FR +B: No. 29 FR-GND: No. 28 13 (Left-front) FL +B: No. 12 FL-GND: No. 34 15 (Right-rear) RR +B: No. 30 RR-GND: No. 8 17 (Left-rear) RL +B: No. 11 RL-GND: No. 10 Is there continuity? YES -Repair a short to body ground in the wire between the VSA modulator-control unit and the appropriate wheel speed sensor. NO -Replace the appropriate wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ).
17. Measure the resistance between the appropriate VSA modulator-control unit 46P connector wheel speed sensor +B and GND terminals (see table), then measure the resistance between the same terminals after reversing the positive and negative tester probes. DTC Appropriate Terminal + B GND 11 (Right-front) FR +B: No. 29 FR-GND: No. 28 13 (Left-front) FL +B: No. 12 FL-GND: No. 34 15 (Right-rear) RR +B: No. 30 RR-GND: No. 8 17 (Left-rear) RL +B: No. 11 RL-GND: No. 10 Is the resistance infinity (ohmmeter may read OL) in both directions? YES -Go to step 18. NO -Go to step 20 .
18. Disconnect the appropriate wheel speed sensor 2P connector (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ).
19. On the sensor side, measure the resistance between appropriate wheel speed sensor 2P connector terminals No. 1 and No. 2, then measure resistance between the same terminals after reversing the positive and negative tester probes. Is the resistance infinity (ohmmeter may read OL) in both directions? YES -Replace the appropriate wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ). NO -Repair an open in the wire between the appropriate wheel speed sensor and the VSA modulator-control unit.
20. Check for continuity between the appropriate VSA modulator-control unit 46P connector wheel speed sensor +B and GND terminals (see table), then check for continuity between the same terminals after reversing the positive and negative tester probes. DTC Appropriate Terminal +B GND 11 (Right-front) FR +B: No. 29 FR-GND: No. 28 13 (Left-front) FL +B: No. 12 FL-GND: No. 34 15 (Right-rear) RR +B: No. 30 RR-GND: No. 8 17 (Left-rear) RL +B: No. 11 RL-GND: No. 10 Is there continuity in both directions? YES -Go to step 21. NO -Reconnect the VSA modulator-control unit 46P connector, then go to step 29 .
21. Disconnect the appropriate wheel speed sensor 2P connector (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ).
22. Check for continuity between the appropriate VSA modulator-control unit 46P connector wheel speed sensor-I-B and GND terminals (see table), then check for continuity between the same terminals after reversing the positive and negative tester probes. DTC Appropriate Terminal +B GND 11 (Right-front) FR +B: No. 29 FR-GND: No. 28 13 (Left-front) FL +B: No. 12 FL-GND: No. 34 15 (Right-rear) RR +B: No. 30 RR-GND: No. 8 17 (Left-rear) RL +B: No. 11 RL-GND: No. 10 Is there continuity in both directions? YES -Repair a short in the wires between the VSA modulator-control unit and the appropriate wheel speed sensor. NO -Go to step 23.
23. Substitute a known-good wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ).
24. Reconnect all connectors.
25. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
26. Clear the DTC with the HDS.
27. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
28. Check for DTCs with the HDS. Is DTC 11, 13, 15, or 17 indicated? YES -Go to step 29. NO -Replace the original wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ).
29. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
30. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
31. Check for DTCs with the HDS. Is DTC 11, 13, 15, or 17 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 12: Right-Front Wheel Speed Sensor Signal Malfunction; DTC 14: Left-Front Wheel Speed Sensor Signal Malfunction; DTC 16: Right-Rear Wheel Speed Sensor Signal Malfunction; DTC 18: Left-Rear Wheel Speed Sensor Signal Malfunction

Note. If the ABS and other indicators come on because of electrical noise, the indicators will go off when you test-drive the vehicle speed at 9 mph (15 km/h) or more and the noise is gone. An incorrectly installed wheel bearing can cause one of these DTCs. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Check the appropriate wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ) and inspect the magnetic encoder on the appropriate hub bearing for debris: Front (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-front/#front-suspension) ), rear (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-rear/#rear-suspension) ). DTC Appropriate Wheel Speed Sensor and Magnetic Encoder 12 Right-front 4 Left-front 16 Right-rear 18 Left-rear Are they installed correctly in good condition, and free of debris? YES -Go to step 3. NO -Reinstall or replace the appropriate wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ), hub bearing unit; front (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-front/#front-suspension) ), rear (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-rear/#rear-suspension) ), and retest by test-driving.
3. Substitute an appropriate known-good wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ).
4. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
5. Clear the DTC with the HDS.
6. Test-drive the vehicle at 9 mph (15 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
7. Check for DTCs with the HDS. Is DTC 12, 14, 16, or 18 indicated? YES -Go to step 8. NO -Replace the original wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ).
8. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
9. Substitute an appropriate known-good hub bearing unit: Front (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-front/#front-suspension) ), rear (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-rear/#rear-suspension) ).
10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
11. Clear the DTC with the HDS.
12. Test-drive the vehicle at 9 mph (15 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
13. Check for DTCs with the HDS. Is DTC 12, 14, 16, or 18 indicated? YES -Go to step 14. NO -Replace the original hub bearing unit: Front: Replace the original front hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-front/#front-suspension) ). Rear: Replace the original rear hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-rear/#rear-suspension) ).
14. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
15. Test-drive the vehicle at 9 mph (15 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
16. Check for DTCs with the HDS. Is DTC 12, 14, 16, or 18 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 21: Right-Front Magnetic Encoder Malfunction; DTC 22: Left-Front Magnetic Encoder Malfunction; DTC 23: Right-Rear Magnetic Encoder Malfunction; DTC 24: Left-Rear Magnetic Encoder Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and 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 at 31 mph (50 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS. Is DTC 21, 22, 23, or 24 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
5. Inspect the appropriate magnetic encoder for damage, debris, and correct installation. DTC Appropriate Magnetic Encoder Note 21 Right-front Remove the hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-front/#front-suspension) ). 22 Left-front 23 Right-rear Remove the hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-rear/#rear-suspension) ). 24 Left-rear Is the magnetic encoder surface OK? YES -Go to step 6. NO -Remove the debris from the magnetic encoder, or replace the hub bearing unit: Front: Remove or replace the front hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-front/#front-suspension) ). Rear: Remove or replace the rear hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-rear/#rear-suspension) ).
6. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
7. Test-drive the vehicle at 31 mph (50 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
8. Check for DTCs with the HDS. Is DTC 21, 22, 23, or 24 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 25: Yaw Rate Sensor Malfunction; DTC 26: Lateral Acceleration Sensor Malfunction; DTC 28: Longitudinal Acceleration Sensor Malfunction

Note. These code(s) will set after a test-drive if the sensor is installed incorrectly. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 26

Scheme 27

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. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS. Is DTC 25, 26, or 28 Indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
5. Check the size, air pressure, and the amount of wear of all four tires. Is the tire condition OK? YES -Go to step 6. NO -Replace the tires and/or adjust the air pressure, then recheck by test-driving.
6. Check the YAW/G COMBINE SENSOR DIAGNOSIS in the VSA FREEZE DATA with the HDS. Is YAW/G COMBINE SENSOR DIAGNOSIS NORMAL? YES -Go to step 12 . NO -Go to step 7.
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Disconnect the yaw rate-acceleration sensor 4P connector (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__yaw-rate-acceleration-sensor-replacement) ).
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
10. Measure the voltage between yaw rate-acceleration sensor 4P connector terminals No. 1 and No. 4. Is there battery voltage? YES -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) ). NO -Go to step 11.
11. Measure the voltage between yaw rate-acceleration sensor 4P connector terminal No. 1 and body ground. Is there battery voltage? YES -Repair an open in the wire between the yaw rate-acceleration sensor and body ground (G405). NO -Repair an open in the wire between the yaw rate-acceleration sensor and the driver's under-dash fuse/relay box.
12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
13. Disconnect the yaw rate-acceleration sensor 4P connector (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__yaw-rate-acceleration-sensor-replacement) ).
14. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
15. Measure the voltage between yaw rate-acceleration sensor 4P connector terminals No. 1 and No. 4. Is there battery voltage? YES -Go to step 17 . NO -Go to step 16.
16. Measure the voltage between yaw rate-acceleration sensor 4P connector terminal No. 1 and body ground. Is there battery voltage? YES -Repair an open in the wire between the yaw rate-acceleration sensor and body ground (G405). NO -Repair an open in the wire between the yaw rate-acceleration sensor and the driver's under-dash fuse/relay box.
17. Check the wheel alignment (see «WHEEL ALIGNMENT»(/acura/zdx/i-2009-2013/remont/wheel-alignment/#front-and-rear-suspension-inspection__wheel-alignment) ). Is the wheel alignment OK? YES -Go to step 18. NO -Make sure the suspension is not modified, and correct the wheel alignment, and recheck by test-d riving.
18. Substitute a known-good 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) ).
19. Reconnect all connectors.
20. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
21. Clear the DTC with the HDS.
22. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
23. Check for DTCs with the HDS. Is DTC 25, 26, or 28 indicated? YES -Go to step 24. NO -Replace the original 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) ).
24. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
25. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
26. Check for DTCs with the HDS. Is DTC 25, 26, or 28 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 27: Steering Angle Sensor Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and 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 for DTCs with the HDS. Is DTC 86 indicated with DTC 27 at the same time? YES -Do the DTC 86 troubleshooting (see «DTC 86: F-CAN COMMUNICATION MALFUNCTION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__dtc-86-f-can-communication-malfunction) ). 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. Substitute a known-good steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__steering-angle-sensor-replacement) ).
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Do the VSA sensor neutral position memorization with the HDS (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-sensor-neutral-position-memorization) ).
7. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
8. Check the DTC with the HDS. Is DTC 27 indicated? YES -Go to step 9. NO -Replace the original steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__steering-angle-sensor-replacement) ).
9. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
10. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
11. Check the DTC with the HDS. Is DTC 27 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 31, 32, 33, 34, 35, 36, 37, 38: ABS Solenoid Valve Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and 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 it to ON (II) again, or select the OFF mode, then the ON mode.
4. Check for DTCs with the HDS. Is DTC 31, 32, 33, 34, 35, 36, 37, or 38 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
6. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
7. Check for DTCs with the HDS. Is DTC 31, 32, 33, 34, 35, 36, 37, or 38 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 51: Motor Lock; DTC 52: Motor Stuck

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 30

Scheme 31

Scheme 32

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 at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS. Is DTC 51 or 52 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Check the No. 1 (40 A) fuse in the auxiliary under-hood fuse/relay box. Is the fuse blown? YES -Go to step 7. NO -Reinstall the checked fuse, then go to step 14 .
7. Disconnect the VSA modulator-control unit 46P connector (see step 4 ).
8. Check for continuity between VSA modulator-control unit 46P connector terminal No. 45 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the No. 1 (40 A) fuse in the auxiliary under-hood fuse/relay box and the VSA modulator-control unit. NO -Install a new No. 1 (40 A) fuse in the auxiliary under-hood fuse/relay box, then go to step 9.
9. Reconnect the VSA modulator-control unit 46P connector.
10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
11. Clear the DTC with the HDS.
12. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
13. Check for DTCs with the HDS. Is DTC 51 or 52 indicated? YES -Go to step 18 . NO -Troubleshooting is complete.
14. Disconnect the VSA modulator-control unit 46P connector (see step 4 ).
15. Measure the voltage between VSA modulator-control unit 46P connector terminal No. 45 and body ground. Is there battery voltage? YES -Go to step 16. NO -Repair an open in the wire between the No. 1 (40 A) fuse in the auxiliary under-hood fuse/relay box and the VSA modulator-control unit.
16. Check for continuity between VSA modulator-control unit 46P connector terminal No. 46 and body ground. Is there continuity? YES -Go to step 17. NO -Repair an open in the wire between the VSA modulator-control unit and body ground (G302).
17. Reconnect the VSA modulator-control unit 46P connector.
18. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
19. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
20. Check for DTCs with the HDS. Is DTC 51 or 52 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 53: Motor Stuck

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 33

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode. Is the pump motor running? YES -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -Go to step 2.
2. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
3. Disconnect the VSA modulator-control unit 46P connector (see step 4 ).
4. Check for continuity between VSA modulator-control unit 46P connector terminal No. 46 and body ground. Is there continuity? YES -Go to step 5. NO -Repair an open in the wire between the VSA modulator-control unit and body ground (G302).
5. Reconnect the VSA modulator-control unit 46P connector.
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
7. Clear the DTC with the HDS.
8. Test-drive the vehicle at 9 mph (15 km/h) or more, with the engine speed at 2, 500 rpm or more. NOTE: Drive the vehicle on the road, not on a lift.
9. Check for DTCs with the HDS. Is DTC 53 indicated? YES -Go, to step 10. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
10. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
11. Test-drive the vehicle at 9 mph (15 km/h) or more, with the engine speed at 2, 500 rpm or more. NOTE: Drive the vehicle on the road, not on a lift.
12. Check for DTCs with the HDS. Is DTC 53 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 54: Fail-Safe Relay Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 34

Scheme 35

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Check the No. 2 (20 A) fuse in the auxiliary under-hood fuse/relay box. Is the fuse blown? YES -Go to step 3. NO -Reinstall the checked fuse, then go to step 5 .
3. Disconnect the VSA modulator-control unit 46P connector (see step 4 ).
4. Check for continuity between VSA modulator-control unit 46P connector terminal No. 44 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the No. 2 (20 A) fuse in the auxiliary under-hood fuse/relay box and the VSA modulator-control unit. NO -Install a new No. 2 (20 A) fuse, then go to step 7 .
5. Disconnect the VSA modulator-control unit 46P connector (see step 4 ).
6. Measure the voltage between VSA modulator-control unit 46P connector terminal No. 44 and body ground. Is there battery voltage? YES -Go to step 7. NO -Repair an open in the wire between the No. 2 (20 A) fuse in the auxiliary under-hood fuse/relay box and the VSA modulator-control unit.
7. Reconnect the VSA modulator-control unit 46P connector.
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Clear the DTC with the HDS.
10. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
11. Check for DTCs with the HDS. Is DTC 54 indicated? YES -Go to step 12. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
12. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
13. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
14. Check for DTCs with the HDS. Is DTC 54 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 61: Battery Voltage Low; DTC 62: Battery Voltage High

Note. If the vehicle has high electric load or a weak battery, DTC 61 may be stored when starting the engine. An overcharging alternator can cause DTC 62. Before you troubleshoot, record all freeze data and any on-board snapshot, and 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 it to ON (II) again, or select the OFF mode, then the ON mode. Does the ABS indicator come on? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
4. Check for DTCs with the HDS. Is DTC 61 or 62 indicated? YES -Check the battery (see «BATTERY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#battery) ) and alternator and regulator circuit troubleshooting (see «ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/charging-system/#charging-system__alternator-and-regulator-circuit-troubleshooting) ). NO -Do the appropriate troubleshooting for the DTC indicated.

DTC 65: Brake Fluid Level Low

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 36

Scheme 37

1. Check the brake fluid level in the master cylinder reservoir. Is the brake fluid level OK? YES -Go to step 2. NO -Do the brake pad inspection; front (see «FRONT BRAKE PAD INSPECTION AND REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system__front-brake-pad-inspection-and-replacement) ), rear (see «REAR BRAKE PAD INSPECTION AND REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system__rear-brake-pad-inspection-and-replacement) ), check for brake fluid leaks or replace worn brake pads, then go to step 2 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. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
5. Check for DTCs with the HDS. Is DTC 65 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Disconnect the brake fluid level switch 2P connector (see step 2 under «MASTER CYLINDER REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system__master-cylinder-replacement) ).
8. On the switch side, check for continuity between brake fluid level switch 2P connector terminal No. 1 and No. 2 with the float in the up position (see «PARKING BRAKE SWITCH TEST»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system__parking-brake-switch-test) ). Is there continuity? YES -Replace the reservoir (brake fluid level switch is included) on the master cylinder (see «MASTER CYLINDER REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system__master-cylinder-replacement) ). NO -Go to step 9.
9. Disconnect gauge control module connector A (32P) (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
10. Check for continuity between brake fluid level switch 2P connector terminal No. 2 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the gauge control module and the brake fluid level switch. NO -Do the gauge control module self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#gauges__self-diagnostic-function) ).

DTC 66: Pressure Sensor Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and 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 it to ON (II) again, or select the OFF mode, then the ON mode.
4. Check for DTCs with the HDS. Is DTC 66 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
6. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
7. Check for DTCs with the HDS. Is DTC 66 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-Control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 68: Brake Pedal Position Switch Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and 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 for DTCs with the HDS. Is DTC 86 indicated with DTC 68 at the same time? YES -Do the DTC 86 troubleshooting (see «DTC 86: F-CAN COMMUNICATION MALFUNCTION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__dtc-86-f-can-communication-malfunction) ). NO -Go to step 3.
3. Check the BRAKE SWITCH in the VSA DATA LIST with the HDS while moving the brake pedal. Does it indicate ON when the pedal is pressed, and OFF when the pedal is released? YES -Go to step 4. NO -Go to step 7 .
4. Clear the DTC with the HDS.
5. Test-drive the vehicle at 9 mph (15 km/h) for 60 seconds or more. NOTE: Drive the vehicle on the road, not on a lift.
6. Check for DTCs with the HDS. Is DTC 68 indicated? YES -Go to step 10 . NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Disconnect the brake pedal position switch 4P connector (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system) ).
9. Do the brake pedal position switch test (see «BRAKE PEDAL POSITION SWITCH TEST»(/acura/zdx/i-2009-2013/remont/exterior-lights/#exterior-lights) ). Is the brake pedal position switch OK? YES -Check for fuel and emissions systems DTCs (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems) ), and troubleshoot those DTCs first, if no fuel and emissions systems DTCs are found troubleshoot the brake pedal position switch signal circuit (see «BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system) ). NO -Replace the brake pedal position switch (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system) ).
10. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
11. Test-drive the vehicle at 9 mph (15 km/h) for 60 seconds or more. NOTE: Drive the vehicle on the road, not on a lift.
12. Check for DTCs with the HDS. Is DTC 68 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 81: VSA Modulator-Control Unit Internal Circuit Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and 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 it to ON (II) again, or select the OFF mode, then the ON mode.
4. Check for DTCs with the HDS. Is DTC 81 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
6. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
7. Check for DTCs with the HDS. Is DTC 81 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 83: PGM-FI Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and 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 for DTCs with the HDS. Is DTC 86 indicated with DTC 83 at the same time? YES -Do the DTC 86 troubleshooting (see «DTC 86: F-CAN COMMUNICATION MALFUNCTION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__dtc-86-f-can-communication-malfunction) ). NO -Go to step 3.
3. Check for fuel and emissions systems DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems) ). Are any DTCs indicated? YES -Do the applicable troubleshooting for the PCM. NO -Go to step 4.
4. Clear the DTC with the HDS.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, then start the engine.
6. Check for DTCs with the HDS. Is DTC 83 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
7. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
8. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, then start the engine.
9. Check for DTCs with the HDS. Is DTC 83 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 84: VSA Sensor Neutral Position Not Written

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and 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 for DTCs with the HDS. Are any DTCs indicated with DTC 84 at the same time? YES -Troubleshoot any other DTCs first. NO -Go to step 3.
3. Do the VSA sensor neutral position memorization with the HDS (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-sensor-neutral-position-memorization) ).
4. Clear the DTC with the HDS.
5. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
6. Check for DTCs with the HDS. Is DTC 84 indicated? YES -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) ), then do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-sensor-neutral-position-memorization) ). NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).

DTC 86: F-CAN Communication Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

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 and run the engine for at least 5 seconds.
4. Check for DTCs with the HDS. Is DTC 86 indicated? YES -Go to step 5. NO -Check the COMMU PCM, COMMU GAUGE, COMMU STEERING ANGLES, and COMMU YAW RATE/G, in the VSA FREEZE DATA with the HDS. Then check for F-CAN communication lines continuity to the appropriate system or sensor and loose terminals in the appropriate system or sensor connectors.
5. Check the COMMU PCM, COMMU GAUGE, COMMU STEERING ANGLES, and COMMU YAW RATE/G, in the VSA FREEZE DATA with the HDS. Is there a communication error in the system or sensor? YES -Go to step 6. NO -Go to step 22 .
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Short the SCS line with the HDS.
8. Disconnect the PCM connector A (49P) (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
9. Disconnect the VSA modulator-control unit 46P connector (see step 4 ).
10. Disconnect gauge control module connector A (32P) (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
11. Disconnect the steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__steering-angle-sensor-replacement) ).
12. Disconnect the yaw rate-acceleration sensor 4P connector (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__yaw-rate-acceleration-sensor-replacement) ).
13. Check the F-CAN communication lines for continuity between the VSA modulator-control unit and the appropriate system or sensor (see table). Component F-CAN A L Terminal F-CAN A H Terminal VSA Modulator-Control Unit 38 39 PCM A49 A48 Gauge Control Module A13 A14 Steering Angle Sensor 2 4 Yaw Rate-Acceleration Sensor 2 3 Is there continuity on the F-CAN communication lines? YES - If the appropriate system or sensor is the yaw rate-acceleration sensor: go to step 14. If the appropriate system or sensor is not the yaw rate-acceleration sensor: go to step 18 . NO -Repair an open in the appropriate line.
14. Check for loose terminals in the yaw rate-acceleration sensor 4P connector. Is the yaw rate-acceleration sensor 4P connector OK? YES -Go to step 15. NO -Repair or reconnect the connector securely.
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
16. Measure the voltage between yaw rate-acceleration sensor 4P connector terminals No. 1 and No. 4. Is there battery voltage? YES -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) ). NO -Go to step 17.
17. Measure the voltage between yaw rate-acceleration sensor 4P connector terminal No. 1 and body ground. Is there battery voltage? YES -Repair an open in the wire between the yaw rate-acceleration sensor and body ground (G405). NO -Repair an open in the wire between the yaw rate-acceleration sensor and the driver's under-dash fuse/relay box.
18. Check for loose terminals in the appropriate system connectors. Are the appropriate system connectors OK? YES -Go to step 19. NO -Repair or reconnect the connector securely.
19. Reconnect all connectors.
20. Start and run the engine for at least 5 seconds.
21. Check for other system DTCs with the HDS. Is another DTC indicated? YES -Do the appropriate DTC troubleshooting. NO -Go to step 22.
22. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
23. Start and run the engine for at least 5 seconds.
24. Check for DTCs with the HDS. Is DTC 86 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 88: Difference in Wheel Speed

Note. A wheel bearing that is installed backwards can cause this DTC. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

1. Check all four tires for size, inflation, and wear (see «WHEEL ALIGNMENT»(/acura/zdx/i-2009-2013/remont/wheel-alignment/#front-and-rear-suspension-inspection__wheel-alignment) ). Are all four tires the correct size, properly inflated, and worn evenly? YES -Go to step 2. NO -Install the correct tires, a known-good set of tires, or set the tires to the correct pressure, and retest by test-driving.
2. Test-drive the vehicle at 9 mph (15 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
3. Check the RIGHT FRONT, LEFT FRONT, RIGHT REAR, LEFT REAR WHEEL SPEED in the VSA DATA LIST with the HDS Are all four tires the same Indicated value? YES -Go to step 4. NO -Reinstall or replace the wheel speed sensor(s) (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ), and retest by test-driving.
4. Check all magnetic encoders on the hub bearing units for debris or cracks: Front (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-front/#front-suspension) ), rear (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-rear/#rear-suspension) ). Are they installed correctly and in good condition? YES -Go to step 5. NO -Clean and reinstall or replace the hub bearing unit(s), and retest by test-driving: Front: Reinstall or replace the front hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-front/#front-suspension) ). Rear: Reinstall or replace the rear hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/suspension-rear/#rear-suspension) ).
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
6. Test-drive the vehicle at 9 mph (15 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
7. Check for DTCs with the HDS. Is DTC 88 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 91: VSA Activation Time Too Long

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

1. Check the brake system for leaks or mechanical problems. Is the brake system OK? (No brake fluid leakage, no air trapped in the brake system, no brake pads worn out.) YES -Go to step 2. NO -Repair the brake system, then 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. Test-drive the vehicle in a straight line. Accelerate the vehicle up to 6 mph (10 km/h), and stop, then accelerate up to 6 mph (10 km/h). NOTE: Drive the vehicle on the road, not on a lift.
5. Check for DTCs with the HDS. Is DTC 91 indicated? YES -Go to step 6. NO -If any DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) . If DTCs are not indicated, intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
6. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
7. Test-drive the vehicle in a straight line. Accelerate the vehicle up to 6 mph (10 km/h), and stop, then accelerate up to 6 mph (10 km/h). NOTE: Drive the vehicle on the road, not on a lift.
8. Check for DTCs with the HDS. Is DTC 91 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 113: Yaw Rate-Acceleration Sensor Power Source Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 44

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Disconnect the yaw rate-acceleration sensor 4P connector (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__yaw-rate-acceleration-sensor-replacement) ).
3. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
4. Measure the voltage between body ground and yaw rate-acceleration sensor 4P connector terminal No. 1. Is there battery voltage? YES -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) ). NO -Repair an open in the wire between the No. 6 (7.5 A) fuse in the driver's under-dash fuse/relay box and the yaw rate-acceleration sensor.

DTC 121, 122, 123, 124: VSA Solenoid Valve Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and 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 it to ON (II) again, or select the OFF mode, then the ON mode.
4. Check for DTCs with the HDS. Is DTC 121, 122, 123, or 124 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
6. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
7. Check for DTCs with the HDS. Is DTC 121, 122, 123, or 124 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 131: Yaw Rate Sensor Malfunction

Note. Driving on an extremely angled or crowned road can cause this DTC. Before you troubleshoot, record all freeze data and any on-board snapshot, and 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 for DTCs with the HDS. Is DTC 86 indicated with DTC 131 at the same time? YES -Do the DTC 86 troubleshooting (see «DTC 86: F-CAN COMMUNICATION MALFUNCTION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__dtc-86-f-can-communication-malfunction) ). 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. Check that the yaw rate-acceleration sensor is properly mounted (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__yaw-rate-acceleration-sensor-replacement) ). Is the yaw rate-acceleration sensor installation OK? YES -Go to step 5. NO -Reinstall 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) ), and retest by test-driving.
5. Put the vehicle on a level surface.
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
7. Check the YAW RATE SENSOR in the VSA DATA LIST with the HDS. Is the YAW RATE 0°±5°/s? YES -Go to step 8. 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) ).
8. Clear the DTC with the HDS.
9. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
10. Check for DTCs with the HDS. Is DTC 131 indicated? YES -Go to step 11. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Substitute a known-good 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) ).
13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
14. Clear the DTC with the HDS.
15. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
16. Check for DTCs with the HDS. Is DTC 131 indicated? YES -Go to step 17. NO -Replace the original 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) ).
17. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
18. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
19. Check for DTCs with the HDS. Is DTC 131 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 132: Lateral Acceleration Sensor Malfunction; DTC 133: Lateral Acceleration Sensor Malfunction (Installation Error); DTC 135: Longitudinal Acceleration Sensor Malfunction; DTC 136: Longitudinal Acceleration Sensor Malfunction (Installation Error)

Note. Driving on an extremely angled or crowned road can cause this DTC. Before you troubleshoot, record all freeze data and any on-board snapshot, and 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 for DTCs with the HDS. Is DTC 86 indicated with DTC 132, 133, 135, or 136 at the same time? YES -Do the DTC 86 troubleshooting (see «DTC 86: F-CAN COMMUNICATION MALFUNCTION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__dtc-86-f-can-communication-malfunction) ). 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. Check that the yaw rate-acceleration sensor is properly mounted (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__yaw-rate-acceleration-sensor-replacement) ). Is the yaw rate-acceleration sensor installation OK? YES -Go to step 5. NO -Reinstall 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) ), and retest by test-driving.
5. Put the vehicle on a level surface.
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
7. Check the LATERAL ACCELERATION SENSOR and LONGITUDINAL ACCELERATION SENSOR in the VSA DATA LIST with the HDS. Are there 0±1 m/s indicated? YES -Go to step 8. 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) ).
8. Clear the DTC with the HDS.
9. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
10. Check for DTCs with the HDS. Is DTC 132, 133, 135, or 136 indicated? YES -Go to step 11. NO -Intermittent failure, the system is OK at this time. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__intermittent-failures) (see ).
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Substitute a known-good 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) ).
13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
14. Clear the DTC with the HDS.
15. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
16. Check for DTCs with the HDS. Is DTC 132, 133, 135, or 136 indicated? YES -Go to step 17. NO -Replace the original 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) ).
17. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
18. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
19. Check for DTCs with the HDS. Is DTC 132, 133, 135, or 136 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 134: Steering Angle Sensor Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and 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 for DTCs with the HDS. Is DTC 86 indicated with DTC 134 at the same time? YES -Do the DTC 86 troubleshooting (see «DTC 86: F-CAN COMMUNICATION MALFUNCTION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__dtc-86-f-can-communication-malfunction) ). NO -Go to step 3.
3. Park the vehicle on a level surface, and put the front wheels in the straight ahead position.
4. Check STEERING ANGLE in the VSA DATA LIST with the HDS. With the front wheels in the straight ahead position, is the STEERING ANGLE 0°±5°? YES -Go to step 5. NO -Check the installation of 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) ). If installation is OK, do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-sensor-neutral-position-memorization) ).
5. Check the wheel alignment (see «WHEEL ALIGNMENT»(/acura/zdx/i-2009-2013/remont/wheel-alignment/#front-and-rear-suspension-inspection__wheel-alignment) ). Is the wheel alignment within the specification? YES -Go to step 6. NO -Make sure the suspension is not modified, adjust the wheel alignment correctly, then go to step 6.
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
7. Clear the DTCs with the HDS.
8. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
9. Check for DTCs with the HDS. Is DTC 134 indicated? YES -Go to step 10. NO -The system is OK at this time.
10. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
11. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
12. Check for DTCs with the HDS. Is DTC 134 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 137: Pressure Sensor Offset Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 45

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 86 indicated with DTC 137 at the same time? YES -Do the DTC 86 troubleshooting (see «DTC 86: F-CAN COMMUNICATION MALFUNCTION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__dtc-86-f-can-communication-malfunction) ). 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 the brake pedal position switch 4P connector (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system) ).
5. Do the brake pedal position switch test (see «BRAKE PEDAL POSITION SWITCH TEST»(/acura/zdx/i-2009-2013/remont/exterior-lights/#exterior-lights) ). Is the brake pedal position switch OK? YES -Go to step 6. NO -Replace the brake pedal position switch (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system) ).
6. Short the SCS line with the HDS.
7. Disconnect PCM connector A (49P) (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
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 PCM connector A (49P) terminal No. 8 and body ground. Is there 0.1 V or more when the brake pedal is released? YES -Repair a short to power in the wire between the brake pedal position switch and the PCM. 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. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
14. Clear the DTC with the HDS.
15. Test-drive the vehicle at 7 mph (12 km/h) for 60 seconds or more. NOTE: Drive the vehicle on the road, not on a lift.
16. Check for DTCs with the HDS. Is DTC 137 indicated? YES -Check for loose terminals in the PCM connector A (49P). If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then retest. If the PCM was substituted, go to step 17. NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
17. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
18. Test-drive the vehicle at 7 mph (12 km/h)for 60 seconds or more. NOTE: Drive the vehicle on the road, not on a lift.
19. Check for DTCs with the HDS. Is DTC 137 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 138: Brake Pedal Position Switch Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 46

Scheme 47

Scheme 48

Scheme 49

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 86 indicated with DTC 138 at the same time? YES -Do the DTC 86 troubleshooting (see «DTC 86: F-CAN COMMUNICATION MALFUNCTION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__dtc-86-f-can-communication-malfunction) ). 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. Check the No. 10(15 A) fuse in the under-hood fuse/relay box. Is the fuse blown? YES -Go to step 5. NO -Reinstall the checked fuse, then go to step 15 .
5. Short the SCS line with the HDS.
6. Disconnect the PCM connector A (49P) (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
7. Disconnect the brake pedal position switch 4P connector (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system) ).
8. Check for continuity between PCM connector A (49P) terminal No. 8 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the PCM and the brake pedal position switch. NO -Go to step 9.
9. Check for continuity between brake pedal position switch 4P connector terminal No. 1 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the No. 10 (15 A) fuse in the under-hood fuse/relay box and the brake pedal position switch. NO -Go to step 10.
10. Reconnect all connectors, then install a new No. 10 (15 A) fuse.
11. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
12. Clear the DTC with the HDS.
13. Start the engine, then press the brake pedal slowly and hard.
14. Check for DTCs with the HDS. Is DTC 138 indicated? YES -Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, then go to step 21 . NO -The system is OK at this time.
15. Disconnect the brake pedal position switch 4P connector (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system) ).
16. Measure the voltage between brake pedal position switch 4P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 17. NO -Repair an open in the wire between the No. 10 (15 A) fuse in the under-hood fuse/relay box and the brake pedal position switch.
17. Short the SCS line with the HDS.
18. Disconnect the PCM connector A (49P) (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
19. Check for continuity between brake pedal position switch 4P connector terminal No. 2 and PCM connector A (49P) terminal No. 8. Is there continuity? YES -Go to step 20. NO -Repair an open in the wire between the PCM and the brake pedal position switch.
20. Reconnect all connectors.
21. Do the brake pedal position switch test (see «BRAKE PEDAL POSITION SWITCH TEST»(/acura/zdx/i-2009-2013/remont/exterior-lights/#exterior-lights) ). Is the brake pedal position switch OK? YES -Go to step 22. NO -Replace the brake pedal position switch (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system) ).
22. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
23. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
24. Clear the DTC with the HDS.
25. Start the engine, then press the brake pedal slowly and hard.
26. Check for DTCs with the HDS. Is DTC 138 indicated? YES -Check for loose terminals in the PCM connector A (49P). If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then retest. If the PCM was substituted, go to step 27. NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
27. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
28. Start the engine, then press the brake pedal slowly and hard.
29. Check for DTCs with the HDS. Is DTC 138 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

DTC 158: ECU Software Update Failure

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

1. Update the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
2. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
3. Check for DTCs with the HDS. Is DTC 158 Indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) .

VSA cannot be turned OFF

Note. If the low tire pressure indicator turns ON, the VSA cannot be turned OFF. Check the tire pressure first.

Scheme 50

Scheme 51

Scheme 52

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Check the VSA OFF switch (see «VSA OFF SWITCH TEST/REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-off-switch-testreplacement) ). Is the VSA OFF switch OK? YES -Go to step 3. NO -Replace the multi switch (built-in VSA OFF switch) (see «VSA OFF SWITCH TEST/REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-off-switch-testreplacement) ).
3. Disconnect the multi switch 12P connector (see «VSA OFF SWITCH TEST/REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-off-switch-testreplacement) ).
4. Disconnect gauge control module connector A (32P) (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
5. Check for continuity between gauge control module connector A (32P) terminal No. 26 and multi switch 12P connector terminal No. 7. Is there continuity? YES -Go to step 6. NO -Repair an open in the wire between the gauge control module and the multi switch (built-in VSA OFF switch).
6. Check for continuity between multi switch 12P connector terminal No. 7 and body ground. Is there continuity? YES -Repair a short to body ground between the gauge control module and the multi switch (built-in VSA OFF switch). NO -Go to step 7.
7. Check for continuity between multi switch 12P connector terminal No. 2 and body ground. Is there continuity? YES -Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ), and recheck. If it is OK, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ). NO -Repair an open in the wire between the multi switch (built-in VSA OFF switch) and body ground (G401).

Scheme 53

Scheme 54

Scheme 55

Scheme 56

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Check the No. 6 (7.5 A) fuse in the driver's under-dash fuse/relay box. Is the fuse blown? YES -Go to step 3. NO -Reinstall the checked fuse, then go to step 9 .
3. Disconnect the VSA modulator-control unit 46P connector (see step 4 ).
4. Disconnect the steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__steering-angle-sensor-replacement) ).
5. Disconnect the yaw rate-acceleration sensor 4P connector (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__yaw-rate-acceleration-sensor-replacement) ).
6. Check for continuity between VSA modulator-control unit 46P connector terminal No. 40 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the No. 6 (7.5 A) fuse in the driver's under-dash fuse/relay box and the VSA modulator-control unit, the steering angle sensor, or the yaw rate-acceleration sensor. NO -Install a new No. 6 (7.5 A) fuse in the driver's under-dash fuse/relay box, then go to step 7.
7. Reconnect all connectors.
8. Check the ABS indicator, brake system indicator, and VSA indicator for several seconds when the ignition switch is turned to ON (II), or press the engine start/stop button to select the ON mode. Do the indicators come on then go off? YES -The troubleshooting is complete. NO -Go to step 14 .
9. Disconnect the VSA modulator-control unit 46P connector (see step 4 ).
10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
11. Measure the voltage between VSA modulator-control unit 46P connector terminal No. 40 and body ground. Is there battery voltage? YES -Go to step 12. NO -Repair an open in the wire between the No. 6 (7.5 A) fuse in the driver's under-dash fuse/relay box and the VSA modulator-control unit.
12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
13. Check for continuity between VSA modulator-control unit 46P connector terminal No. 43 and body ground. Is there continuity? YES -Go to step 15 . NO -Repair an open in the wire between the VSA modulator-control unit and body ground (G302).
14. Disconnect the VSA modulator-control unit 46P connector (see step 4 ).
15. Disconnect gauge control module connector A (32P) (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
16. Check for continuity between VSA modulator-control unit 46P connector terminals No. 38 and No. 39, and gauge control module connector A (32P) terminals No. 13 and No. 14 individually. Is there continuity? YES -Go to step 17. NO -Repair an open in the wire between the gauge control module and the VSA modulator-control unit.
17. Reconnect all connectors.
18. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
19. Check the ABS indicator, brake system indicator, and VSA indicator for several seconds when the ignition switch is turned to ON (II), or press the engine start/stop button to select the ON mode. Do the indicators come on then go off? YES -If the VSA modulator-control unit was updated, troubleshooting is complete. NO -Check for loose terminals in the VSA modulator-control unit 46P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ).

Steering Angle Sensor Replacement

SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ) and the precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before doing repairs or service.

Note. Do not damage or drop the combination switch assembly/cable reel as the steering angle sensor is sensitive to shock and vibration.

Scheme 57

Scheme 58

Scheme 59

Scheme 60

1. With the front wheels in the straight ahead position and the steering wheel centered, then remove the steering wheel (see «STEERING WHEEL REMOVAL»(/acura/zdx/i-2009-2013/remont/manual-power-steering/#power-steering-system__steering-wheel-removal) ).
2. Remove the steering column covers (see «COLUMN COVER REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#dashboard__column-cover-removalinstallation) ).
3. Disconnect the combination light switch 12P connector (A) and the steering angle sensor 5P connector (B) from the combination switch assembly/cable reel (C).
4. Disconnect the dashboard wire harness 4P connector (A) from the cable reel 4P connector (B), then disconnect the dashboard wire harness 20P connector (C) and the wiper/washer switch 8P connector (D).
5. Remove the combination switch assembly/cable reel mounting screws (A).
6. Remove the wire harness clips (B), then remove the combination switch assembly/cable reel from the steering column.
7. Remove the cable reel (see step 10 under «CABLE REEL REPLACEMENT»(/acura/zdx/i-2009-2013/remont/airbag/#srs-supplemental-restraint-system) ).
8. Remove the combination light switch (A) and the wiper/washer switch (B) from the combination switch body assembly (C). NOTE: When installing the cable reel, set the turn signal canceling sleeve position so that the arrow points (D) straight up.
9. Install the combination switch body assembly in the reverse order of removal, and note these items: Do not remove the steering angle sensor from the combination switch body assembly. Tighten the combination switch assembly/cable reel mounting screw in the proper sequence (see «INSTALLATION»(/acura/zdx/i-2009-2013/remont/manual-power-steering/#power-steering-system) ). Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-sensor-neutral-position-memorization) ).

Yaw Rate-Acceleration Sensor Replacement

Note. Do not damage or drop the sensor as it is sensitive. Do not use power tools when replacing the sensor.

Scheme 61

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Remove the center console trims on both sides (see «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#consoles__center-console-removalinstallation) ).
3. Disconnect the yaw rate-acceleration sensor 4P connector (A), then remove the yaw rate-acceleration sensor (B).
4. Install the yaw rate-acceleration sensor in the reverse order of removal.
5. Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-sensor-neutral-position-memorization) ).
6. Do the yaw rate-acceleration neutral position memorization for SH-AWD system (see «SH-AWD® DIFFERENTIAL CLUTCH TORQUE MEMORIZATION»(/acura/zdx/i-2009-2013/remont/differentials-drive-axles/#rear-differential__sh-awdr-differential-clutch-torque-memorization) ).

VSA Sensor Neutral Position Memorization

Note. Do not press the brake pedal during this procedure.

Scheme 62

1. Park the vehicle on a flat and level surface, with the steering wheel in the straight ahead position.
2. With the ignition switch in LOCK (0), or press the engine start/stop button to select the OFF mode, connect the HDS to the data link connector (DLC) (A) under the driver's side of the dashboard.
3. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
4. Make sure the HDS communicates with the vehicle and the VSA modulator-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) ).
5. Select VSA ADJUSTMENT with the HDS, and follow the screen prompts. NOTE: See the HDS Help menu for specific instructions.
6. Turn the ignition switch in LOCK (0), or press the engine start/stop button to select the OFF mode.

VSA Off Switch Test/Replacement

Note. If the low tire pressure indicator turns ON, the VSA cannot be turned OFF. Check the tire pressure first.

Scheme 63

Scheme 64

Scheme 65

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Remove the driver's outer dashboard trim (see «DRIVER'S OUTER DASHBOARD TRIM REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#dashboard) ).
3. Remove the multi switch (built-in VSA OFF switch) (A), then disconnect the multi switch 12P connector (B) and the power mirror switch 13P connector (C).
4. On the switch side, check for continuity between the multi switch 12P connector terminal in each switch position according to the table.
5. If the continuity is not as specified, remove the power mirror switch (A), then replace the multi switch (built-in VSA OFF switch) (B).
6. Install the multi switch (built-in VSA OFF switch) in the reverse order of removal.

VSA Modulator-Control Unit Update

Special Tools Required

1. Honda Diagnostic System (HDS) tablet tester
2. Honda Interface Module (HIM) and an iN workstation with the latest HDS software version
3. HDS Pocket Tester
4. GNA600 and an iN workstation with the latest HDS software version
5. MVCI unit with the latest control module (CM) update software installed

Any one of the above updating tools can be used.

Note. Use this procedure when you need to update the VSA modulator-control unit at anytime. Make sure the HDS/iN workstation has the latest software version. Before you update the VSA modulator-control unit, make sure the battery in the vehicle is fully charged, and connect a jumper to the battery (not a battery charger) to maintain system voltage. Never turn the ignition switch to LOCK (0) or ACCESSORY (I), or press the engine start/stop button to select the OFF or ACCESSORY mode, during the update. If there is a problem with the update, leave the ignition switch ON (II), or the ON mode. To prevent VSA modulator-control unit damage, do not operate anything electrical (headlights, audio system, brakes, A/C, power windows, door locks, etc.) during the update. To ensure the latest program is installed, do a VSA modulator-control unit update whenever the VSA modulator-control unit is replaced. You cannot update a VSA modulator-control unit with a program it already has. It will only accept a new program. High temperature in the engine compartment might cause the VSA modulator-control unit to become too hot to run the update. If the engine has been running before this procedure, open the hood and cool the engine compartment. If you need to diagnose the Honda interface module (HIM) because the HIM's red (#3) light came on or was flashing during the update, leave the ignition switch in ON (II), or in the ON mode when you disconnect the HIM from the data link connector (DLC). This will prevent VSA modulator-control unit damage. DTCs stored in memory are cleared when the VSA modulator-control unit is updated.

Scheme 66

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, but do not start the engine.
2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Make sure the HDS communicates with the vehicle and the VSA modulator-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 mode, and follow the screen prompts to update the VSA modulator-control unit.
5. If the software in the VSA modulator-control unit is the latest, disconnect the HDS/HIM/GNA600 from the DLC. If the software in the VSA modulator-control unit is not the latest, follow the instructions on the screen.
6. Do the VSA sensor neutral position memorization procedure (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-sensor-neutral-position-memorization) ).

VSA Modulator-Control Unit Removal and Installation

Note. Do not spill brake fluid on the vehicle; it may damage the paint. If brake fluid gets on the paint, wash it off immediately with water.

Note. Be careful not to damage or deform the brake lines during removal and installation. After removal, plug the ends of the hoses and the joints to prevent spilling brake fluid.

Scheme 67

Scheme 68

Scheme 69

Scheme 70

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Remove the air cleaner (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ).
3. Disconnect the 10 mm brake lines (A) and the 12 mm brake lines (B) from the VSA modulator-control unit (C).
4. Disconnect the VSA modulator-control unit 46P connector (A) by pulling up the lever (B); the connector disconnects itself.
5. Remove the VSA modulator-control unit bracket mounting bolts (A), then remove the VSA modulator-control unit (B)-with the bracket (C) from the body.
6. Remove the locknuts (A), then remove the VSA modulator-control unit (B) from the bracket (C).
7. Remove the rubber dampers (D) and the grommet (E) from the VSA modulator-control unit.

Scheme 71

Scheme 72

Scheme 73

Scheme 74

1. Install the new rubber dampers (A) and the new grommet (B) to the VSA modulator-control unit (C) (otherwise, unwanted noise and vibration may be transmitted to the vehicle).
2. Install the VSA modulator-control unit on the bracket (D), then install the new locknuts (E).
3. Install the VSA modulator-control unit (A) with the bracket (B) to the body, then install the VSA modulator-control unit bracket mounting bolts (C).
4. Align the connecting surface of the VSA modulator-control unit 46P connector (A) to the VSA modulator-control unit.
5. Pull down the lever (B) of the VSA modulator-control unit 46P connector, then confirm the connector is fully seated.
6. Connect the 10 mm brake lines and the 12 mm brake lines to the VSA modulator-control unit (A). NOTE: Brake lines are connected to the master cylinder (B), the right-front (C), the left-rear (D), the right-rear (E), and the left-front (F) brake systems.
7. Install the air cleaner (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ).
8. Bleed the brake system (see «BRAKE SYSTEM BLEEDING»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system__brake-system-bleeding) ).
9. Do the VSA modulator-control unit update (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-update) ).
10. Do the VSA sensor neutral position memorization procedure (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__vsa-sensor-neutral-position-memorization) ).
11. Do the CMBS initial check (DTC 100) (see «DTC 64: CMBS OPERATION ERROR (EXCESSIVE OPERATION)»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs__dtc-64-cmbs-operation-error-excessive) ).

Scheme 75

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Remove the clip (A), then disconnect the wheel speed sensor connector (B).
3. Remove the bolts and the wheel speed sensor (C).
4. Install the wheel speed sensor in the reverse order of removal, and note these items: Do not twist the sensor wires. If the wheel speed sensor comes in contact with the hub bearing unit, it is faulty. Make sure there is no debris in the sensor mounting hole.

Scheme 76

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Remove the clip (A), then disconnect the wheel speed sensor connector (B).
3. Remove the clip (left side), the bolts, and the wheel speed sensor (C).
4. Install the wheel speed sensor in the reverse order of removal, and note these items: Do not twist the sensor wires. If the wheel speed sensor comes in contact with the hub bearing unit, it is faulty. Make sure there is no debris in the sensor mounting hole.

See also:
• BRAKE SYSTEM BLEEDING
• DLC CIRCUIT TROUBLESHOOTING
• SELF-DIAGNOSTIC FUNCTION
• GENERAL TROUBLESHOOTING INFORMATION
• HUB BEARING UNIT REPLACEMENT
• HUB BEARING UNIT REPLACEMENT
• WHEEL ALIGNMENT
• BATTERY TEST
• ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING
• FRONT BRAKE PAD INSPECTION AND REPLACEMENT
• REAR BRAKE PAD INSPECTION AND REPLACEMENT
• MASTER CYLINDER REPLACEMENT
• PARKING BRAKE SWITCH TEST
• GAUGE CONTROL MODULE REPLACEMENT
• BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT
• BRAKE PEDAL POSITION SWITCH TEST
• BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING
• PCM REPLACEMENT
• PCM UPDATE
• SUBSTITUTING THE PCM
• COMPONENT LOCATION INDEX
• STEERING WHEEL REMOVAL
• COLUMN COVER REMOVAL/INSTALLATION
• INSTALLATION
• CENTER CONSOLE REMOVAL/INSTALLATION
• SH-AWD® DIFFERENTIAL CLUTCH TORQUE MEMORIZATION
• DRIVER'S OUTER DASHBOARD TRIM REMOVAL/INSTALLATION
• AIR CLEANER ELEMENT INSPECTION/REPLACEMENT
• DTC 64: CMBS OPERATION ERROR (EXCESSIVE OPERATION)
• DTC'S TROUBLESHOOTING
• 11
• 12
• 21
• 25
• 27
• 31
• 51
• 53
• 54
• 61
• 65
• 66
• 68
• 81
• 83
• 84
• 86
• 88
• 91
• 113
• 121
• 131
• 132
• 134
• 137
• 138
• 158
• VSA MODULATOR-CONTROL UNIT UPDATE
• VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION
• VSA CANNOT BE TURNED OFF
• VSA SENSOR NEUTRAL POSITION MEMORIZATION
• INTERMITTENT FAILURES TROUBLESHOOTING
• YAW RATE-ACCELERATION SENSOR REPLACEMENT
• STEERING ANGLE SENSOR REPLACEMENT
• VSA OFF SWITCH TEST/REPLACEMENT