Vsa (vehicle Stability Assist) System Acura MDX II

Scheme 1

System Indicator

This system has four indicators and one warning

Scheme 2

1. ABS indicator (A)
2. Brake system indicator (B)
3. VSA indicator (C)
4. VSA activation indicator (D)
5. Trailer stability assist warning (E)

When the system detects a problem, it will turn the appropriate indicator 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), 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 function is lost, the parking brake is applied, and/or the brake fluid level is low.

VSA Indicator

The VSA indicator comes on, when VSA function is lost.

VSA Activation Indicator

The VSA activation indicator blinks, when the VSA function is activating. The VSA activation indicator comes on, when the VSA is turned OFF by using the VSA OFF switch, or the VSA function is lost. The VSA activation indicator is on until the steering angle sensor center point writing is done (see STEERING ANGLE SENSOR CENTER POINT WRITING ).

Trailer Stability Assist Warning

Trailer stability assist warning comes on, when the brake light relay has malfunctioned or when VSA function is lost.

ABS, VSA Indicators, and Trailer Stability Assist Warning go off

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

1. DTC 61,62: The indicators go off automatically when the system returns to normal.
2. DTC 11, 13, 15, 17, 21*, 22, 25, 26, 27, 31, 32, 33, 34, 35, 36, 37, 38, 45, 46, 47, 48, 54, 59, 65, 66, 67, 68, 69, 72, 73, 74, 75, 76, 81, 84, 91, 92, or 97* *: The indicators stay on until the ignition switch is turned to LOCK (0) whether or not the system returns to normal. * : There are some cases that the indicators stay on until the vehicle is driven after the system returns to normal. * * : There are some cases that the indicators go off automatically when the system returns to normal.
3. DTC 12, 14, 16, 18, 51, 52, or 53: 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 indicated in the order they occur.
3. The DTCs are memorized in the EEPROM. 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) 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).
2. When the system detects a problem, the VSA modulator-control unit shifts to the fail-safe mode.

Kickback

The pump motor operates When the VSA modulator-control unit is functioning, and the fluid in the reservoir 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 one time after completing initial diagnosis during regular when the vehicle is driven over 10 mph (15 km/h) and at 19 mph (30 km/h).

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, VSA indicators, and/or trailer stability assist warning are still on. Following a troubleshooting procedure for a code 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, VSA indicators, and/or trailer stability assist warning 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, VSA indicators, or trailer stability assist warning does 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. before you start troubleshooting.
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, VSA indicators, and trailer stability assist warning do not come on.
4. Check for DTCs from other systems which connected via F-CAN. If there are DTCs that are related to F-CAN, the most likely cause was that the ignition switch was turned to ON (II) with the VSA modulator-control unit connector disconnected. Clear the DTCs. Check for fuel and emissions codes, first. Be sure to troubleshoot those first.

Intermittent Failures

The term "intermittent failure" means a system may have had a failure, but it checks OK now. If the indicator(s) of the system does not come on, check for loose connectors or poor contacts in the terminals related to the circuit that you are troubleshooting.

Scheme 3

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).
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
4. Check the diagnostic trouble code (DTC) and note it. Then refer to the indicated «DTC'S TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) , and do the appropriate troubleshooting procedure. NOTE: The HDS can read the DTC, 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 at LOCK (0), 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).
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
4. Follow the prompts on the HDS to display the DTC(s) on the screen. After determining the DTC, refer to the «DTCS TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) .
5. Turn the ignition switch to LOCK (0).

How to Clear DTCs

1. With the ignition switch at LOCK (0), 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).
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
4. Clear the DTC(s) by following the screen prompts on the HDS.
5. Turn the ignition switch to LOCK (0).

DTC Troubleshooting Index

DTC TROUBLESHOOTING INDEX

Symptom Troubleshooting Index

When the vehicle has one of these symptoms, check for a diagnostic trouble code (DTC) with the HDS. If there is no DTC, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.

DTC TROUBLESHOOTING INDEX

Scheme 4

CONNECTOR TERMINAL RESULT REFERENCE

Scheme 5

CONNECTOR TERMINAL RESULT REFERENCE

System Outline

This system is composed of the VSA modulator-control unit, the wheel speed sensors, the steering angle sensor, and the yaw rate-lateral/longitudinal acceleration sensor, and the system indicators in the gauge control module. The VSA modulator-control unit controls the ABS, EBD, TCS, VSA, trailer stability assist, and brake assist with the brake pressure of each wheel and the 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.

Scheme 7

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 Features

The electronic brake distribution (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.

Scheme 9

TCS 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.

Scheme 10

Oversteer control

Applies the brake to the front and rear outside wheels

Scheme 11

Scheme 12

1. Applies the brake to the rear inside wheel
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

BRAKE FLUID SPECIFICATION

Trailer Stability Assist Features

While towing a trailer, factors, such as a lane change, inappropriate tongue weight, and crosswind, can cause trailer sway. This may also cause the vehicle to sway. The trailer stability assist helps stabilize the vehicle, using the same system as VSA (VSA modulator-control unit and sensors). With signals from each sensor, the trailer stability assist detects when trailer sway affects the vehicle, and then reduces vehicle speed while stabilizing the vehicle. The rear brake lights automatically turn on when the trailer stability assist activates.

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

1. Turn the ignition switch to ON (II).
2. Check for DTCs with the HDS. Is DTC 22 indicated with DTC 11, 13, 15, and/or 17 at the same time? YES -Go to step 9 . NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
5. Check for DTCs with the HDS. Is DTC 11, 13, 15, and/or 17 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for loose terminals between the wheel speed sensor 2P connector and the VSA modulator-control unit 46P connector. Check for a loose connection at G303. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
6. Turn the ignition switch to LOCK (0).
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 -Reconnect the connector and retest.
8. Check that the appropriate wheel speed sensor is properly mounted (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). DTC REFERENCE 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, and check the mounting position (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ).
9. Turn the ignition switch to LOCK (0).
10. Disconnect the VSA modulator-control unit 46P connector.
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 «TERMINAL REFERENCE»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). TERMINAL REFERENCE 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 VSA MODULATOR-CONTROL UNIT 46P CONNECTOR Is there 0.1 V or more? YES -Repair 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).
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 «TERMINAL REFERENCE»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). TERMINAL REFERENCE 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 VSA MODULATOR-CONTROL UNIT 46P CONNECTOR Is there continuity? YES -Go to step 15. NO -Go to step 17 .
15. Disconnect the appropriate wheel speed sensor 2P connector.
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 «TERMINAL REFERENCE»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). TERMINAL REFERENCE 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 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/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ).
17. Measure the resistance between the appropriate VSA modulator-control unit 46P connector wheel speed sensor +B and GND terminals (see table «TERMINAL REFERENCE»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ), then measure the resistance between the same terminals and reverse the positive and negative tester probes. TERMINAL REFERENCE 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.
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 and reverse 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/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). NO -Repair 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 «TERMINAL REFERENCE»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ), then check for continuity between the same terminals and reverse the positive and negative tester probes. TERMINAL REFERENCE 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 -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest.
21. Disconnect the appropriate wheel speed sensor 2P connector.
22. Check for continuity between the appropriate VSA modulator-control unit 46P connector wheel speed sensor +B and GND terminals (see table «TERMINAL REFERENCE»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ), then check for continuity between the same terminals and reverse the positive and negative tester probes. TERMINAL REFERENCE 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 short in the wires 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/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ).

DTC 12,14,16,18: Wheel Speed Sensor (Electrical Noise/Intermittent Interruption)

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 10 mph (15 km/h) or more and the noise is gone. An incorrectly installed wheel bearing can cause one of these DTCs.

1. Turn the ignition switch to LOCK (0).
2. Check the appropriate wheel speed sensor and inspect the magnetic encoder on the appropriate hub bearing for debris: Front (see «KNUCKLE/HUB BEARING UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#front-suspension) ), rear (see «KNUCKLE/HUB BEARING UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#rear-suspension) ). TERMINAL REFERENCE DTC Appropriate Wheel Speed Sensor and Magnetic Encoder 12 Right-front 14 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, hub bearing unit, and retest by test-driving.
3. Substitute an appropriate known-good wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ).
4. Turn the ignition switch to ON (II).
5. Clear the DTC with the HDS.
6. Test-drive the vehicle at 10 mph (15 km/h) or more.
7. Check for DTCs with the HDS. Is DTC 12, 14, 16, and/or 18 indicated? YES -Go to step 8. NO -Replace the original wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ).
8. Turn the ignition switch to LOCK (0).
9. Substitute an appropriate known-good hub bearing unit: Front (see «KNUCKLE/HUB BEARING UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#front-suspension) ), rear (see «KNUCKLE/HUB BEARING UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#rear-suspension) ).
10. Turn the ignition switch to ON (II).
11. Clear the DTC with the HDS.
12. Test-drive the vehicle at 10 mph (15 km/h) or more.
13. Check for DTCs with the HDS. Is DTC 12, 14, 16, and/or 18 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Replace the original hub bearing unit: Front: Replace the original front hub bearing unit (see «KNUCKLE/HUB BEARING UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#front-suspension) ). Rear: Replace the original rear hub bearing unit (see «KNUCKLE/HUB BEARING UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#rear-suspension) ).

DTC 21: Difference in Wheel Speed

Note. A wheel bearing that is installed backwards can cause this DTC.

1. Check all four tires for size, inflation, and wear. 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.
3. Check the RF, LF, RR, LR WHEEL SPD in the VSA DATA LIST with the HDS. Are all four the same indicated value? YES -Go to step 4. NO -Reinstall or replace the wheel speed sensor(s) (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ), and retest by test-driving.
4. Check all magnetic encoders on the hub bearing units: Front (see «KNUCKLE/HUB BEARING UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#front-suspension) ), rear (see «KNUCKLE/HUB BEARING UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#rear-suspension) ). Are they installed correctly and in good condition? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Reinstall or replace the hub bearing unit(s), and retest by test-driving: Front: Reinstall or replace the front hub bearing unit (see «KNUCKLE/HUB BEARING UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#front-suspension) ). Rear: Reinstall or replace the rear hub bearing unit (see «KNUCKLE/HUB BEARING UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#rear-suspension) ).

DTC 22: Current Flow Into Wheel Speed Sensor Input Amplifier

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
4. Check for DTCs with the HDS. Is DTC 22 indicated? YES -Do the DTC 11, 13, 15, and/or 17 troubleshooting (see «DTC 11, 13, 15, 17: Wheel Speed Sensor (Open/Short to Body Ground/Short to Power)»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). NO -Intermittent failure, the system is OK at this time. Check for loose terminals between the wheel speed sensor 2P connector and the VSA modulator-control unit 46P connector. Check for a loose connection at G303. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) (see ).

DTC 25: Yaw Rate Sensor (Sensor Unit); DTC 26: Lateral/Longitudinal Acceleration Sensor (Sensor Unit)

Note. These code(s) will set after a test drive if the sensor is installed incorrectly.

1. Turn the ignition switch to ON (II).
2. Check for DTCs with the HDS. Is DTC 91 or 92 indicated with DTC 25 or 26 at the same time? YES -Do the DTC 91 or 92 troubleshooting: DTC 91 (see «DTC 91: F-CAN COMMUNICATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-91-f-can-communication) ), DTC 92 (see «DTC 92: F-CAN SYSTEM (BUS-OFF)»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-92-f-can-system-bus-off) ). NO -Go to step 3.
3. Turn the ignition switch to LOCK (0).
4. Substitute a known-good yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ).
5. Turn the ignition switch to ON (II).
6. Clear the DTC with the HDS.
7. Test-drive the vehicle. Drive the vehicle at 19 mph (30 km/h) or more, and go a distance of 985 ft (300 m) or more.
8. Check for DTCs with the HDS. Is DTC 25 or 26 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Replace the original yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ).

DTC 27: Steering Angle Sensor (Hardware)

1. Turn the ignition switch to ON (II).
2. Check for DTCs with the HDS. Is DTC 91 or 92 indicated with DTC 27 at the same time? YES -Do the DTC 91 or 92 troubleshooting: DTC 91 (see «DTC 91: F-CAN COMMUNICATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-91-f-can-communication) ), DTC 92 (see «DTC 92: F-CAN SYSTEM (BUS-OFF)»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-92-f-can-system-bus-off) ). NO -Go to step 3.
3. Check the steering angle sensor installation (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-replacement) ). Is the steering angle sensor installed correctly? YES -Replace the steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-replacement) ), then do the steering angle sensor center point writing (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ). NO -Reinstall the steering angle sensor correctly (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-replacement) ), then do the steering angle sensor center point writing (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ).

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
4. Check for DTCs with the HDS. Is DTC 31, 32, 33, 34, 35, 36, 37, and/or 38 indicated? YES -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO -Intermittent failure, the system is OK at this time. Check for a loose connection at G303.

DTC 45, 46, 47, 48: VSA Solenoid

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
4. Check for DTCs with the HDS. Is DTC 45, 46, 47, and/or 48 indicated? YES -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO -Intermittent failure, the system is OK at this time. Check for a loose connection at G303.

DTC 51: Motor Locked

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Test-drive the vehicle. Drive the vehicle at 10 mph (15 km/h) or more, with the engine speed at 2,500 rpm or higher.
4. Check for DTCs with the HDS. Is DTC 51 indicated? YES -Inspect G303 for loose or poor connection, then replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO -Intermittent failure, the system is OK at this time. Check for a loose connection at G303.

Scheme 26

Scheme 27

1. Turn the ignition switch to LOCK (0).
2. Check the No. 2 (40 A) fuse in the main under-hood fuse 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.
4. Check for continuity between VSA modulator-control unit 46P connector terminal No. 45 and body ground. Is there continuity? YES -Repair short to body ground in the wire between the No. 2 (40 A) fuse in the main under-hood fuse box and the VSA modulator-control unit. NO -Install a new No. 2 (40 A) fuse, then go to step 7 .
5. Disconnect the VSA modulator-control unit 46P connector.
6. Measure the voltage between VSA modulator-control unit 46P connector terminal No. 45 and body ground. Is there battery voltage? YES -Go to step 7. NO -Repair open in the wire between the No. 2 (40 A) fuse in the main under-hood fuse box and the VSA modulator-control unit.
7. Reconnect the VSA modulator-control unit 46P connector.
8. Turn the ignition switch to ON (II).
9. Clear the DTC with the HDS.
10. Test-drive the vehicle. Drive the vehicle at 10 mph (15 km/h) or more, with the engine speed at 2,500 rpm or higher.
11. Check for DTCs with the HDS. Is DTC 52 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Intermittent failure, the system is OK at this time. Check for loose terminals at the VSA modulator-control unit 46P connector. Check for a loose connection at G303. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

Scheme 28

1. Turn the ignition switch to ON (II). Is the pump motor running? YES -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO -Go to step 2.
2. Turn the ignition switch to LOCK (0).
3. Disconnect the VSA modulator-control unit 46P connector.
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 open in the wire between the VSA modulator-control unit and body ground (G303).
5. Reconnect the VSA modulator-control unit 46P connector.
6. Turn the ignition switch to ON (II).
7. Clear the DTC with the HDS.
8. Test-drive the vehicle. Drive the vehicle at 10 mph (15 km/h) or more, with the engine speed at 2,500 rpm or higher.
9. Check for DTCs with the HDS. Is DTC 53 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Intermittent failure, the system is OK at this time. Check for loose terminals at the VSA modulator-control unit 46P connector. Check for a loose connection at G303. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

Scheme 29

Scheme 30

1. Turn the ignition switch to LOCK (0).
2. Check the No. 12 (20 A) fuse in the main under-hood fuse 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.
4. Check for continuity between VSA modulator-control unit 46P connector terminal No. 44 and body ground. Is there continuity? YES -Repair short to body ground in the wire between the No. 12 (20 A) fuse in the main under-hood fuse box and the VSA modulator-control unit. NO -Install a new No. 12 (20 A) fuse, then go to step 7 .
5. Disconnect the VSA modulator-control unit 46P connector.
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 open in the wire between the No. 12 (20 A) fuse in the main under-hood fuse box and the VSA modulator-control unit.
7. Reconnect the VSA modulator-control unit 46P connector.
8. Turn the ignition switch to ON (II).
9. Clear the DTC with the HDS.
10. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
11. Check for DTCs with the HDS. Is DTC 54 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Intermittent failure, the system is OK at this time. Check for loose terminals at the VSA modulator-control unit 46P connector. Check for a loose connection at G303. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

Scheme 31

Scheme 32

1. Turn the ignition switch to LOCK (0).
2. Check the brake lights without pressing the brake pedal. Are the brake lights on? YES -Repair short to power in the brake light circuit. NO -Go to step 3.
3. Turn the ignition switch to ON (II).
4. Check the brake lights without pressing the brake pedal. Are the brake lights on? YES -Go to step 5. NO -Go to step 9 .
5. Turn the ignition switch to LOCK (0).
6. Disconnect the VSA modulator-control unit 46P connector.
7. Turn the ignition switch to ON (II).
8. Check the brake lights without pressing the brake pedal. Are the brake lights on? YES -Go to step 9. NO -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest.
9. Clear the DTC with the HDS.
10. Press the brake pedal for 3 seconds or more.
11. Check for DTCs with the HDS. Is DTC 59 indicated YES -Go to step 12. NO -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest.
12. Turn the ignition switch to LOCK (0).
13. Disconnect the brake pedal position switch 4P connector.
14. Turn the ignition switch to ON (II).
15. Measure the voltage between the brake pedal position switch 4P connector terminal No. 2 and body ground with the headlights OFF and ON. Is there less than 0.5 V? YES -Go to step 16. NO -Disconnect the taillight assemblies one at a time and retest. If the voltage is OK, check the taillight ground connection and then replace the faulty taillight.
16. Turn the ignition switch to LOCK (0).
17. Short the SCS line with the HDS.
18. Disconnect the PCM connector A (49P).
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 -Replace the PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Repair open in the wire between the PCM and the brake pedal position switch.

DTC 61: IG1 Voltage Low

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Test-drive the vehicle at 2 mph (3 km/h) or more.
4. Check for DTCs with the HDS. Is DTC 61 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for loose terminals at the VSA modulator-control unit 46P connector. Check for a loose connection at G303. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) (see ).
5. Test the battery and connections. Are the battery and battery connections OK? YES -Check for a poor connection at all IG1 circuit connections between the VSA modulator-control unit 46P connector terminal No. 40 and the under-dash fuse/relay box No. 29 (10A) fuse. If the connections are good, go to the Alternator and Regulator Circuit Troubleshooting (see «ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/charging-system/#charging-system) ). NO -Replace or charge the battery (see «BATTERY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#battery) ), or repair the connections.

DTC 62: IG1 Voltage High

Note. An overcharging alternator can cause this DTC.

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Test-drive the vehicle at 2 mph (3 km/h) or more.
4. Check for DTCs with the HDS. Is DTC 62 indicated? YES -Check for a poor connection at the battery terminals. Check for a loose connection at G303. If the connections are good, go to the Alternator and Regulator Circuit Troubleshooting (see «ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/charging-system/#charging-system) ). NO -Intermittent failure, the system is OK at this time. Check for loose terminals at the VSA modulator-control unit 46P connector. Check for a loose connection at G303. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

DTC 65: VSA Pressure Sensor (Hardware)

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
4. Check for DTCs with the HDS. Is DTC 65 indicated? YES -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO -Intermittent failure, the system is OK at this time. Check for a loose connection at G303.

Scheme 33

1. Turn the ignition switch to ON (II).
2. Check for DTCs with the HDS. Is DTC 91 or 92 indicated with DTC 66 at the same time? YES -Do the DTC 91 or 92 troubleshooting: DTC 91 (see «DTC 91: F-CAN COMMUNICATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-91-f-can-communication) ), DTC 92 (see «DTC 92: F-CAN SYSTEM (BUS-OFF)»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-92-f-can-system-bus-off) ). NO -Go to step 3.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the brake pedal position switch 4P connector.
5. Do the brake pedal position switch test (see «BRAKE PEDAL POSITION SWITCH TEST»(/acura/mdx/ii-2006-2010/remont/exterior-lights/#exterior-lights) ). Is the switch OK? YES -Go to step 6. NO -Replace the brake pedal position switch (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/mdx/ii-2006-2010/remont/mechanical-hydraulic/#conventional-brake-components) ).
6. Short the SCS line with the HDS.
7. Disconnect the PCM connector A (49P).
8. Turn the ignition switch to ON (II).
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 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).
11. Substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
12. Turn the ignition switch to ON (II).
13. Clear the DTC with the HDS.
14. Test-drive the vehicle at 8 mph (12 km/h) for 60 seconds or more.
15. Check for DTCs with the HDS. Is DTC 66 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ), and retest. NO -Replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).

DTC 67: Brake Pedal Position Switch Stuck ON (Hardware)

1. Turn the ignition switch to ON (II).
2. Check for DTCs with the HDS. Is DTC 91 or 92 indicated with DTC 67 at the same time? YES -Do the DTC 91 or 92 troubleshooting: DTC 91 (see «DTC 91: F-CAN COMMUNICATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-91-f-can-communication) ), DTC 92 (see «DTC 92: F-CAN SYSTEM (BUS-OFF)»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-92-f-can-system-bus-off) ). 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 10 mph (15 km/h) for 60 seconds or more.
6. Check for DTCs with the HDS. Is DTC 67 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Intermittent failure, the system is OK at this time. Check for loose terminals at the VSA modulator-control unit 46P connector. Check for a loose connection at G303. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
7. Turn the ignition switch to LOCK (0).
8. Disconnect the brake pedal position switch 4P connector.
9. Do the brake pedal position switch test (see «BRAKE PEDAL POSITION SWITCH TEST»(/acura/mdx/ii-2006-2010/remont/exterior-lights/#exterior-lights) ). Is the switch OK? YES -Check for fuel and emissions systems DTCs (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/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/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system) ). NO -Replace the brake pedal position switch (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/mdx/ii-2006-2010/remont/mechanical-hydraulic/#conventional-brake-components) ).

Scheme 34

Scheme 35

Scheme 36

Scheme 37

1. Turn the ignition switch to LOCK (0).
2. Check the No. 11 (15 A) fuse in the main under-hood fuse box. Is the fuse blown? YES -Go to step 3. NO -Reinstall the checked fuse, then go to step 14 .
3. Short the SCS line with the HDS.
4. Disconnect the PCM connector A (49P).
5. Disconnect the brake pedal position switch 4P connector.
6. Remove the brake light relay.
7. Check for continuity between PCM connector A (49P) terminal No. 8 and body ground. Is there continuity? YES -Repair short to body ground in the wire between the PCM and the brake pedal position switch or the brake light relay. NO -Go to step 8.
8. Check for continuity between brake pedal position switch 4P connector terminal No. 1 and body ground. Is there continuity? YES -Repair short to body ground in the wire between the No. 11 (15 A) fuse in the main under-hood fuse box and the brake pedal position switch or the brake light relay. NO -Go to step 9.
9. Reconnect all connectors, and install the brake light relay.
10. Turn the ignition switch to ON (II).
11. Clear the DTC with the HDS.
12. Start the engine, then press the brake pedal slowly and hard.
13. Check for DTCs with the HDS. Is DTC 68 indicated? YES -Turn the ignition switch to LOCK (0), then go to step 20 . NO -The system is OK at this time.
14. Disconnect the brake pedal position switch 4P connector.
15. Measure the voltage between brake pedal position switch 4P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 16. NO -Repair open in the wire between the No. 11 (15 A) fuse in the main under-hood fuse box and the brake pedal position switch.
16. Short the SCS line with the HDS.
17. Disconnect the PCM connector A (49P).
18. 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 19. NO -Repair open in the wire between the PCM and the brake pedal position switch.
19. Reconnect all connectors.
20. Do the brake pedal position switch test (see «BRAKE PEDAL POSITION SWITCH TEST»(/acura/mdx/ii-2006-2010/remont/exterior-lights/#exterior-lights) ). Is the switch OK? YES -Go to step 21. NO -Replace the brake pedal position switch (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/mdx/ii-2006-2010/remont/mechanical-hydraulic/#conventional-brake-components) ).
21. Substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
22. Turn the ignition switch to ON (II).
23. Clear the DTC with the HDS.
24. Start the engine, then press the brake pedal slowly and hard.
25. Check for DTCs with the HDS. Is DTC 68 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
4. After the VSA indicator goes off, press the brake pedal for 3 seconds or more.
5. Check for DTCs with the HDS. Is DTC 69 indicated? YES -Go to step 6. NO -Go to step 19 .
6. Turn the ignition switch to LOCK (0).
7. Remove the brake light relay.
8. Disconnect the brake pedal position switch 4P connector.
9. Check for continuity between the brake pedal position switch 4P connector terminal No. 2 and the brake light relay 5P connector terminal No. 4. Is there continuity? YES -Go to step 10. NO -Repair open in the wire between the brake pedal position switch and the brake light relay.
10. Disconnect the VSA modulator-control unit 46P connector.
11. Check for continuity between the VSA modulator-control unit 46P connector terminal No. 6 and the brake light relay 5P connector terminal No. 1. Is there continuity? YES -Go to step 12. NO -Repair open in the wire between the VSA modulator-control unit and the brake light relay.
12. Substitute a known-good brake light relay.
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II).
15. Clear the DTC with the HDS.
16. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
17. After the VSA indicator goes off, press the brake pedal for 3 seconds or more.
18. Check for DTCs with the HDS. Is DTC 69 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Replace the original brake light relay.
19. Turn the ignition switch to LOCK (0).
20. Disconnect the VSA modulator-control unit 46P connector.
21. Turn the ignition switch to ON (II).
22. Connect the VSA modulator-control unit 46P connector terminal Mo. 37 to body ground with a jumper wire.
23. Check the brake lights without pressing the brake pedal. Are the brake lights on? YES -Go to step 29 . NO -Go to step 24.
24. Turn the ignition switch to LOCK (0).
25. Remove the brake light relay.
26. Check for continuity between the VSA modulator-control unit 46P connector terminal No. 37 and the brake light relay 5P connector terminal No. 3. Is there continuity? YES -Go to step 27. NO -Repair open in the wire between the VSA modulator-control unit and the brake light relay.
27. Turn the ignition switch to ON (II).
28. Measure the voltage between brake light relay 5P connector terminal No. 5 and body ground. Is there battery voltage? YES -Replace the brake light relay. NO -Repair open in the wire between the No. 20 (7.5 A) fuse in the under-dash fuse/relay box and the brake light relay.
29. Turn the ignition switch to LOCK (0).
30. Check for continuity between VSA modulator-control unit 46P connector terminal No. 6 and brake light relay 5P connector terminal No. 1. Is there continuity? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary/ substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Repair open in the wire between the VSA modulator-control unit and the brake light relay.

DTC 72: Steering Angle Sensor (Software)

1. Turn the ignition switch to ON (II).
2. Check for DTCs with the HDS. Is DTC 91 or 92 indicated with DTC 72 at the same time? YES -Do the DTC 91 or 92 troubleshooting: DTC 91 (see «DTC 91: F-CAN COMMUNICATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-91-f-can-communication) ), DTC 92 (see «DTC 92: F-CAN SYSTEM (BUS-OFF)»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-92-f-can-system-bus-off) ). NO -Go to step 3.
3. Put the vehicle on a level surface, and center the steering wheel spokes.
4. Check STEERING ANGLE in the VSA DATA LIST with the HDS. With the front wheels in the straight ahead position, is STEERING ANGLE 0° ± 5°? YES -Go to step 5. NO -Check the installation of the steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-replacement) ). If installation is good, do the steering angle sensor center point writing (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ).
5. Check the wheel alignment (see «WHEEL ALIGNMENT»(/acura/mdx/ii-2006-2010/remont/wheel-alignment/#front-suspension-and-rear-suspension-alignment__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).
7. Clear the DTCs with the HDS.
8. Test-drive the vehicle around a number of corners.
9. Check for DTCs with the HDS. Is DTC 72 indicated? YES -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO -The system is OK at this time.

Scheme 44

1. Turn the ignition switch to LOCK (0).
2. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 4P connector.
3. Turn the ignition switch to ON (II).
4. Measure the voltage between body ground and yaw rate-lateral/longitudinal acceleration sensor 4P connector terminal No. 1. Is there battery voltage? YES -Replace the yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ). NO -Repair open in the wire between the No. 29 (10 A) fuse in the under-dash fuse/relay box and the yaw rate-lateral/longitudinal acceleration sensor.

DTC 74: Yaw Rate Sensor (Software)

Note. Driving on an extremely angled road can cause this DTC.

1. Turn the ignition switch to ON (II).
2. Check for DTCs with the HDS. Is DTC 97 indicated with DTC 74 at the same time? YES -Do the DTC 97 troubleshooting (see «DTC 97: VSA SYSTEM»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-97-vsa-system) ). NO -Go to step 3.
3. Turn the ignition switch to LOCK (0).
4. Check that the yaw rate-lateral/longitudinal acceleration sensor is properly mounted (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ). Is the yaw rate-lateral/longitudinal acceleration sensor installation OK? YES -Go to step 5. NO -Reinstall the yaw rate-lateral/longitudinal acceleration sensor (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ), and retest by test-driving.
5. Put the vehicle on a level surface.
6. Turn the ignition switch to ON (II).
7. Check the YAW RATE S 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-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ).
8. Clear the DTC with the HDS.
9. Test-drive the vehicle around a number of corners.
10. Check for DTCs with the HDS. Is DTC 74 indicated? YES -Go to step 11. NO -Intermittent failure; the most probable cause is the vehicle has been driven on an extremely angled road. The system is OK at this time.
11. Turn the ignition switch to LOCK (0).
12. Substitute a known-good yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ).
13. Turn the ignition switch to ON (II).
14. Clear the DTC with the HDS.
15. Test-drive the vehicle around a number of corners.
16. Check for DTCs with the HDS. Is DTC 74 indicated? YES -Check for loose terminal in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Replace the original yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ).

DTC 75: Lateral/Longitudinal Acceleration Sensor (Joint Failure); DTC 76: Lateral/Longitudinal Acceleration Sensor (Software)

Note. Driving on an extremely angled road can cause this DTC.

1. Turn the ignition switch to ON (II).
2. Check for DTCs with the HDS. Is DTC 97 indicated with DTC 75 or 76 at the same time? YES -Do the DTC 97 troubleshooting (see «DTC 97: VSA SYSTEM»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-97-vsa-system) ). NO -Go to step 3.
3. Turn the ignition switch to LOCK (0).
4. Check that the yaw rate-lateral/longitudinal acceleration sensor is properly mounted (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ). Is the yaw rate-lateral/longitudinal acceleration sensor installation OK? YES -Go to step 5. NO -Reinstall the yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ), and retest by test-driving.
5. Put the vehicle on a level surface.
6. Turn the ignition switch to ON (II).
7. Check the LATERAL ACCELERATION SENSOR in the VSA DATA LIST with the HDS. Is LATERAL ACCELERATION 0 ± 1 m/s? YES -Go to step 8. NO -Replace the yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ).
8. Clear the DTC with the HDS.
9. Test-drive the vehicle around a number of corners.
10. Check for DTCs with the HDS. Is DTC 75 or 76 indicated? YES -Go to step 11. NO -Intermittent failure; the most probable cause is the vehicle has been driven on an extremely angled road. The system is OK at this time.
11. Turn the ignition switch to LOCK (0).
12. Substitute a known-good yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ).
13. Turn the ignition switch to ON (II).
14. Clear the DTC with the HDS.
15. Test-drive the vehicle around a number of corners.
16. Check for DTCs with the HDS. Is DTC 75 or 76 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Replace the original yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ).

DTC 81: Central Processing Unit (CPU)

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
4. Check for DTCs with the HDS. Is DTC 81 indicated? YES -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO -Intermittent failure, the system is OK at this time. Check for a loose connection at G303.

DTC 84: Steering Angle Sensor No Center Point Writing

1. Turn the ignition switch to ON (II).
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 steering angle sensor center point writing with the HDS (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ).
4. Clear the DTC with the HDS.
5. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
6. Check for DTCs with the HDS. Is DTC 84 indicated? YES -Replace the steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-replacement) ), then do the steering angle sensor center point writing (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ). NO -Intermittent failure, the system is OK at this time. Check for loose terminals between the steering angle sensor 5P connector and the VSA modulator-control unit 46P connector. Check for a loose connection at G303. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

DTC 91: F-CAN Communication

Note. Check the fuel and emissions systems DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). If there are DTCs present, troubleshoot them first.

Scheme 45

Scheme 46

Scheme 47

Scheme 48

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
4. Check for DTCs with the HDS. Is DTC 92 indicated with DTC 91 at the same time? YES -Do the DTC 92 troubleshooting (see «DTC 92: F-CAN SYSTEM (BUS-OFF)»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-92-f-can-system-bus-off) ). NO -If only DTC 91 is indicated, go to step 5. If no DTCs are indicated, intermittent failure, the system is OK at this time. Check for loose terminals between the yaw rate-lateral/longitudinal acceleration sensor 4P connector, the PCM connector A (49P), and the VSA modulator-control unit 46P connector. Check for a loose connection at G303. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
5. Turn the ignition switch to LOCK (0).
6. Short the SCS line with the HDS.
7. Disconnect the PCM connector A (49P).
8. Disconnect the VSA modulator-control unit 46P connector.
9. Check for continuity between VSA modulator-control unit 46P connector terminals No. 38, and No. 39 and PCM connector A (49P) terminals No. 49, and No. 48 individually. Is there continuity? YES -Go to step 10. NO -Repair open in the wire between the PCM and the VSA modulator-control unit.
10. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 4P connector.
11. Turn the ignition switch to ON (II).
12. Measure the voltage between yaw rate-lateral/ longitudinal acceleration sensor 4P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 13. NO -Repair open in the wire between the No. 29 (10 A) fuse in the under-dash fuse/relay box and the yaw rate-lateral/longitudinal acceleration sensor.
13. Turn the ignition switch to LOCK (0).
14. Check for continuity between yaw rate-lateral/ longitudinal acceleration sensor 4P connector terminal No. 4 and body ground. Is there continuity? YES -Go to step 15. NO -Repair open in the wire between the yaw rate-lateral/longitudinal acceleration sensor and body ground (G506).
15. Reconnect all connectors.
16. Test-drive the vehicle. Check the YAW RATE S in the VSA DATA LIST with the HDS while driving in corners. Is there 0°/s indicated? YES -Go to step 17. NO -Check for fuel and emissions systems DTCs (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems) ), and troubleshoot the indicated DTC.
17. Check for continuity between VSA modulator-control unit 46P connector terminals No. 38, and No. 39 and yaw rate-lateral/longitudinal acceleration sensor 4P connector terminals No. 2, and No. 3 individually. Is there continuity? YES -Replace the yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ). NO -Repair open in the wire between the yaw rate-lateral/longitudinal acceleration sensor and the VSA modulator-control unit.

DTC 92: F-CAN System (Bus-off)

Note. Check the fuel and emissions systems DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). If there are DTCs present, troubleshoot them first.

Scheme 49

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
4. Check for DTCs with the HDS. Is DTC 92 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for loose terminals between the PCM connector A (49P), and the VSA modulator-control unit 46P connector. Check for a loose connection at G303. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
5. Turn the ignition switch to LOCK (0).
6. Short the SCS line with the HDS.
7. Disconnect the PCM connector A (44P).
8. Disconnect the VSA modulator-control unit 46P connector.
9. Check for continuity between VSA modulator-control unit 46P connector terminals No. 38, and No. 39 and PCM connector A (49P) terminals No. 49, and No. 48 individually. Is there continuity? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Repair open in the wire between the PCM and the VSA modulator-control unit.

DTC 97: VSA System

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).
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).
5. Check for DTCs with the HDS. Is DTC 97 indicated? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -If any DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) . If DTCs are not indicated, intermittent failure, the system is OK at this time. Check for loose terminals at the VSA modulator-control unit 46P connector. Check for a loose connection at G303. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

Scheme 50

1. Turn the ignition switch to ON (II), and watch the VSA activation indicator. Does VSA activation indicator go off within 2 seconds? YES -The system is OK at this time. NO -Go to step 2.
2. Turn the ignition switch to LOCK (0).
3. Disconnect the VSA OFF switch 5P connector.
4. Check the VSA OFF switch (see «VSA OFF SWITCH TEST»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). Is the VSA OFF switch OK? YES -Go to step 5. NO -Replace the VSA OFF switch (see «VSA OFF SWITCH TEST»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ).
5. Remove the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
6. Disconnect gauge control module connector B (24P).
7. Check for continuity between VSA OFF switch 5P connector terminal No. 2 and body ground. Is there continuity? YES -Repair short to body ground between the gauge control module and the VSA OFF switch. NO -Substitute a known-good gauge control module, then go to step 1 and recheck. If it is OK, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).

Scheme 51

Scheme 52

Scheme 53

Scheme 54

1. Turn the ignition switch to LOCK (0).
2. Check the No. 29 (10 A) fuse in the 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.
4. Disconnect the steering angle sensor 5P connector.
5. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 4P connector.
6. Check for continuity between VSA modulator-control unit 46P connector terminal No. 40 and body ground. Is there continuity? YES -Repair short to body ground in the wire between the No. 29 (10 A) fuse in the under-dash fuse/relay box and the VSA modulator-control unit or the steering angle sensor or the yaw rate-lateral/ longitudinal acceleration sensor. NO -Go to step 7.
7. Reconnect all connectors.
8. Check the ABS indicator, brake system indicator, VSA indicator, and the trailer stability assist warning for several seconds when the ignition switch is turned to ON (II). Do the indicators and warning come on then go off? YES -The system is OK at this time. NO -Go to step 14 .
9. Disconnect the VSA modulator-control unit 46P connector.
10. Turn the ignition switch to ON (II).
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 open in the wire between the No. 29 (10 A) fuse in the under-dash fuse/relay box and the VSA modulator-control unit.
12. Turn the ignition switch to LOCK (0).
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 open in the wire between the VSA modulator-control unit and body ground (G303).
14. Disconnect the VSA modulator-control unit 46P connector.
15. Disconnect gauge control module connector A (12P).
16. Check for continuity between VSA modulator-control unit 46P connector terminals No. 38, and No. 39 and gauge control module connector A (12P) terminals No. 6, and No. 12 individually. Is there continuity? YES -Check for loose terminals in the VSA modulator-control unit 46P connector. Check for a loose connection at G303. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) and retest. NO -Repair open in the wire between the gauge control module and the VSA modulator-control unit.

Steering Angle Sensor Replacement

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

Scheme 55

1. Remove the steering wheel (see «STEERING WHEEL REMOVAL»(/acura/mdx/ii-2006-2010/remont/manual-power-steering/#power-steering-system__steering-wheel-removal) ).
2. Remove the steering column covers (see «COLUMN COVER REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#dashboard__column-cover-removalinstallation) ) and the cable reel (see «CABLE REEL REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/airbag/#srs-supplemental-restraint-system) ).
3. Remove the combination switch assembly (see step 9 on «STEERING COLUMN REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/manual-power-steering/#power-steering-system__steering-column-removal-and-installation) ).
4. Remove the combination light switch (A) and the wiper/washer switch (B).
5. Replace the combination switch body assembly (C).
6. Install the combination switch in the reverse order of removal. NOTE: Do not remove the steering angle sensor from the combination switch body. When installing the cable reel, set the turn signal canceling sleeve position (see «INSTALLATION»(/acura/mdx/ii-2006-2010/remont/airbag/#srs-supplemental-restraint-system) ).
7. Do the steering angle sensor center point writing (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ).

Steering Angle Sensor Center Point Writing

Note. Before doing the steering angle sensor center point writing, place the vehicle on a flat level surface, and turn the steering wheel to the straight ahead position while moving the vehicle.

Scheme 56

1. With the ignition switch at LOCK (0), connect the HDS to the data link connector (DLC) (A) under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
4. Do the steering angle sensor center point writing in the VSA ADJUSTMENT menu with the HDS. NOTE: See the HDS Help menu for specific instructions.
5. Turn the ignition switch to LOCK (0).

Yaw Rate-Lateral/Longitudinal Acceleration Sensor Replacement

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

Scheme 57

1. Turn the ignition switch to LOCK (0).
2. Remove the driver's center console trim (see step 5 on «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#consoles__center-console-removalinstallation) ).
3. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 4P connector (A).
4. Remove the sensor mounting bolts, then remove the yaw rate-lateral/longitudinal acceleration sensor (B).
5. Install in the reverse order of removal.
6. Do the yaw rate-lateral/longitudinal acceleration neutral position memorization (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION NEUTRAL POSITION MEMORIZATION»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__yaw-rate-laterallongitudinal-acceleration-neutral-position-m) ).

Scheme 58

Scheme 59

Scheme 60

1. Turn the ignition switch to LOCK (0).
2. Remove the driver's dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#dashboard) ).
3. Push out the VSA OFF switch (A) from the back of the instrument panel.
4. Disconnect the VSA OFF switch 5P connector (B).
5. Check for continuity between the VSA OFF switch 5P connector terminals No. 1 and No. 2. There should be continuity when the switch is pressed, and no continuity when the switch is released.
6. Check for continuity between the VSA OFF switch 5P connector terminals No. 4 and No. 5. There should be continuity at all times.

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. Be careful not to damage or deform the brake lines during removal and installation. To prevent the brake fluid from flowing, plug and cover the hose ends and joints with a shop towel or equivalent material.

Scheme 61

1. Turn the ignition switch to LOCK (0).
2. Remove the air cleaner box (see «AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system) ).
3. Disconnect the VSA modulator-control unit 46P connector (A) by pulling up the lock (B); the connector disconnects itself.
4. Disconnect the six brake lines from the VSA modulator-control unit. NOTE: Brake lines are connected to the master cylinder (C) and to the right-front (D), the left-rear (E), the right-rear (F), and the left-front (G) brake systems.
5. Remove the VSA modulator-control unit (H) with the bracket (I) from the body.
6. Remove the locknuts (J), then remove the VSA modulator-control unit from the bracket. NOTE: During installation, install a new bushing (K) and new grommets (L). Otherwise, unwanted noise and vibration may be transmitted to the vehicle.

Installation

1. Install the new bushing and new grommets (Otherwise, unwanted noise and vibration may be transmitted to the vehicle).
2. Install the VSA modulator-control unit on the bracket, then install new locknuts.
3. Install the bracket with the VSA modulator-control unit.
4. Reconnect the six brake lines, then tighten the flare nuts with the specified torque.
5. Align the connecting surface of the VSA modulator-control unit 46P connector to the VSA modulator-control unit.
6. Lower the lock of the VSA modulator-control unit 46P connector, then confirm the connector is fully seated.
7. Reinstall the air cleaner box (see «AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system) ).
8. Bleed the brake system (see «BRAKE SYSTEM BLEEDING»(/acura/mdx/ii-2006-2010/remont/mechanical-hydraulic/#conventional-brake-components__brake-system-bleeding) ).
9. Do the steering angle center point writing (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ).
10. Start the engine, and check that the ABS, the VSA indicators, and the trailer stability assist warning goes off.
11. Test-drive the vehicle, and check that the ABS, the VSA indicators, and the trailer stability assist warning do not come on. NOTE: If the brake pedal is spongy, there may be air trapped in the modulator which could then be induced into the normal brake system during modulation. Bleed the brake system again (see «BRAKE SYSTEM BLEEDING»(/acura/mdx/ii-2006-2010/remont/mechanical-hydraulic/#conventional-brake-components__brake-system-bleeding) ).

Scheme 62

1. Turn the ignition switch to LOCK (0).
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: Install the sensor carefully to avoid twisting the wires. If the wheel speed sensor comes in contact with the hub bearing unit, it is faulty.
5. Start the engine, and check that the ABS, the VSA indicators, and the trailer stability assist warning goes off.
6. Test-drive the vehicle, and check that the ABS, the VSA indicators, and the trailer stability assist warning do not come on.

Scheme 63

1. Turn the ignition switch to LOCK (0).
2. Disconnect the wheel speed sensor connector (A).
3. Remove the clips, the bolt, and the wheel speed sensor (B).
4. Install the wheel speed sensor in the reverse order of removal, and note these items: Install the sensor carefully to avoid twisting the wires. If the wheel speed sensor comes in contact with the hub bearing unit, it is faulty.
5. Start the engine, and check that the ABS, the VSA indicators, and the trailer stability assist warning goes off.
6. Test-drive the vehicle, and check that the ABS, the VSA indicators, and the trailer stability assist warning do not come on.

See also:
• BRAKE SYSTEM BLEEDING
• DLC CIRCUIT TROUBLESHOOTING
• SELF-DIAGNOSTIC FUNCTION
• KNUCKLE/HUB BEARING UNIT REPLACEMENT
• KNUCKLE/HUB BEARING UNIT REPLACEMENT
• PCM REPLACEMENT
• ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING
• BATTERY TEST
• BRAKE PEDAL POSITION SWITCH TEST
• BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT
• SUBSTITUTING THE PCM
• GENERAL TROUBLESHOOTING INFORMATION
• BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING
• WHEEL ALIGNMENT
• GAUGE CONTROL MODULE REPLACEMENT
• STEERING WHEEL REMOVAL
• COLUMN COVER REMOVAL/INSTALLATION
• CABLE REEL REPLACEMENT
• STEERING COLUMN REMOVAL AND INSTALLATION
• CENTER CONSOLE REMOVAL/INSTALLATION
• YAW RATE-LATERAL/LONGITUDINAL ACCELERATION NEUTRAL POSITION MEMORIZATION
• DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION
• AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT
• STEERING ANGLE SENSOR CENTER POINT WRITING
• DTC'S TROUBLESHOOTING
• 12
• 21
• 22
• 25
• 27
• 31
• 45
• 51
• 61
• 62
• 65
• 67
• 72
• 74
• 75
• 81
• 84
• 91
• 92
• 97
• VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION
• INTERMITTENT FAILURES TROUBLESHOOTING
• YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT
• STEERING ANGLE SENSOR REPLACEMENT