Vsa (vehicle Stability Assist) System Acura TSX I

Scheme 1

System Indicator

This system has four indicators: ABS indicator (A), VSA indicator (B), VSA activation indicator (C) and brake system indicator (D). When the system detects a problem, it turns on the appropriate indicators. Depending on the failure, the control unit determines which indicators are turned on.

Scheme 2

1. When ABS function is lost: ABS indicator, VSA indicator and VSA activation indicators turn on.
2. When VSA function is lost: VSA indicator and VSA activation indicators turn on.
3. When all functions are lost: All four indicators turn on.
4. When F-CAN circuit problem: VSA indicators and VSA activation indicator turn on.

ABS/VSA Indicator

1. If the system is OK, the ABS and VSA indicators go off 2 seconds after turning the ignition switch ON (II).
2. The ABS and VSA indicators come on when the control unit detects a problem in the system. However, even though the system is operating properly, the indicator may come on under these conditions: Only the drive wheel rotates. One drive wheel is stuck. The vehicle goes into a spin. The ABS or VSA continues to operate for a long time. The vehicle is subjected to an electrical signal disturbance.

To determine the actual cause of the problem, question the client about the problem, taking the above conditions into consideration.

1. When a problem is detected and the ABS indicator comes on, but not the VSA indicator, there are cases when the indicator stays on until the ignition switch is turned OFF, and cases when the indicator goes off automatically when the system returns to normal. DTC 61 or 62: The ABS and VSA indicators go off automatically when the system returns to normal. DTC 11, 13, 15, 17, 31, 32, 33, 34, 35, 36, 37, 38, 53, 54, 71, 81, 112, 121, 122, 123 or 124: The ABS and VSA indicators stay on until the ignition switch is turned OFF whether or not the system returns to normal. DTC 12, 14, 16, 18, 21, 22, 23, 24, 41, 42, 43, 44, 51 or 52: The ABS and VSA indicators stay on until the system returns to normal after the vehicle is driven. DTC 25, 26, 27, 64, 65, 66, 68, 83, 84 or 86: The VSA indicator stays on until the ignition switch is turned OFF whether or not the system returns to normal.

Diagnostic Trouble Code (DTC)

1. The memory can hold any number of 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 ascending number order, not 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 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 OFF.
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 reservoir is forced out to the master cylinder, causing 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 operating during regular diagnosis when the vehicle is driven over 10 mph (15 km/h) the first time after the ignition switch is turned ON (II). You may hear the motor operate at this time, but it is normal.

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 the troubleshooting procedure when the ABS and/or VSA indicator does not come on (no problem is present) can result in incorrect diagnosis.

The connector illustrations show the female terminal connectors with a single outline and the male terminal connectors with a double outline.

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 control, after control, when the vehicle was traveling at a certain speed, etc. If necessary, have the client demonstrate the concern.
2. When the ABS or VSA indicator 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 repairs are done, clear the DTCs, and test-drive the vehicle under the same conditions as originally set with the DTCs. Make sure the ABS and VSA indicators do not come on.
4. Check for DTCs from other control unit 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 ON (II) with the VSA modulator-control unit connector disconnected. Clear the DTCs. Check for PGM-FI and VSA codes, and 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 and grounds, poor contact of the terminals related to the circuit that you are troubleshooting. If the indicators were on but then went out, the original problem may have been intermittent.

Scheme 3

1. With the ignition switch OFF, connect the HDS to the data link connector (DLC) (A) under the driver's side of the dashboard.
2. Turn the ignition switch ON (II).
3. '07-08 models: Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't, troubleshoot the DLC circuit (see «'07-08 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ).
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/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) . NOTE: See the HDS Help menu for specific instructions.
5. Turn the ignition switch OFF.

How to Clear DTCs

Note. You cannot clear the DTCs manually.

Scheme 4

1. With the ignition switch OFF, connect the HDS to the data link connector (DLC) (A) under the driver's side of the dashboard.
2. Turn the ignition switch ON (II).
3. '07-08 models: Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't, troubleshoot the DLC circuit (see «'07-08 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ).
4. Clear the DTC(s) by following the screen prompts on the HDS. NOTE: See the HDS Help menu for specific instructions.
5. If the VSA activation indicator remains on, but the VSA and ABS indicators are OFF, do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-sensor-neutral-position-memorization) ).
6. Turn the ignition switch OFF.

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 5

CONNECTOR TERMINAL REFERENCE

ABS Features

When the brake pedal is pressed while driving, the wheels can 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. The ABS 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 vehicle speed and the wheel speed, then it controls the brake fluid pressure to reach the target slip rate.

Scheme 6

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 ECM/PCM to slow the spinning wheel and keep traction.

Scheme 7

Oversteer control

Applies the brake to the front outside wheel

Scheme 8

Scheme 9

1. Applies the brake to the rear inside wheel
2. Controls the engine torque when accelerating

Electronic Brake Distribution (EBD) Features

Electronic brake distribution (EBD) has been added to the VSA system. EBD eliminates the need for an external, mechanical proportioning valve and improves overall braking performance.

When the vehicle is heavily loaded, most of the increase in weight is born by the rear wheels, increasing braking capability. Proportioning valves maintain a fixed distribution of brake pressure between the front and the rear wheels, making it very difficult to fully utilize increased rear wheel braking capability. EBD varies brake pressure distribution according to load, using input from the wheel speed sensors, which improves overall braking performance.

Scheme 10

Normal Braking

Under normal braking conditions, brake pressure is evenly distributed between the front and rear brakes, and EBD is not used.

Firm Braking

Under hard braking conditions, the VSA modulator-control unit monitors wheel speed in order to allow a maximum amount of brake distribution individually to the rear wheels. Once the VSA modulator-control unit detects that one or both rear wheels are nearing their maximum braking potential, the inlet valve closes for one or both rear wheels, maintaining the current pressure. If the traction is improved, and the wheel(s) is no longer nearing its limits, the VSA modulator-control unit will open the inlet solenoid allowing additional pressure to be distributed to the rear wheel. The rear wheels are controlled independently of each other during EBD function.

If during EBD function the VSA modulator-control unit determines that the wheels are beginning to slip more than a predetermined amount, the control unit abandons EBD control and shifts to select low 3-channel ABS control.

Brake Assist

Brake assist has been added to the VSA system. 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.

Each time the ignition switch is turned ON (II), the VSA modulator-control unit learns the current driver's normal braking characteristics by monitoring the brake pressure sensor and the brake pedal position switch at each stop. Using these inputs and their values, the VSA modulator-control unit is able to learn the driver's normal braking habits, and then determine the difference between a normal stop and a panic stop for the individual driver of the vehicle. If during a panic stop the VSA modulator-control unit determines that the brake system pressure increases above a learned threshold in less than a learned amount of time, the VSA modulator-control unit engages brake assist.

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

Scheme 11

During normal braking conditions, brake assist does not affect brake system pressure.

Panic Stop

During a panic stop, the control unit turns the VSA pump ON, and opens the inlet valve. This brings the brake system pressure up high enough to cause a full ABS stop. As soon as the brake pedal is released, brake assist is stopped and the brake system returns to normal operation.

Modulator Unit

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

The modulator controls the caliper fluid pressure directly. It is a circulating-type modulator because the brake fluid circulates through the caliper, the reservoir, and the master cylinder.

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

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

Pressure Intensifying Mode

VSA NO valve open, VSA NC valve closed, inlet valve open, outlet valve closed.

Master cylinder fluid is pumped out to the caliper.

When starting the pressure reducing mode, the pump motor is ON. When stopping ABS operation, the pump motor is OFF.

The reservoir fluid is pumped out by the pump, through the damping chamber, to the master cylinder.

Scheme 12

Pressure Retaining Mode

VSA NO valve open, VSA NC valve closed, inlet valve closed, outlet valve closed.

Caliper fluid is retained by the inlet valve and outlet valve.

Scheme 13

Pressure Reducing Mode

VSA NO valve open, VSA NC valve closed, inlet valve closed, outlet valve open.

Caliper fluid flows through the outlet valve to the reservoir.

Scheme 14

VSA NO valve closed, VSA NC valve open, inlet valve open, outlet valve closed, pump motor ON.

The reservoir and master cylinder fluid is pumped out by the pump, through the damping chamber, to the front caliper.

Scheme 15

VSA NO valve closed, VSA NC valve open, inlet valve closed, outlet valve closed, pump motor ON.

Front caliper fluid is retained by the inlet valve and outlet valve.

Scheme 16

VSA NO valve closed, VSA NC valve open, inlet valve closed, front outlet valve open, pump motor ON. Caliper fluid flows through the outlet valve to the reservoir.

Scheme 17

VSA NO valve closed, VSA NC valve open, inlet valve open, outlet valve closed, pump motor ON.

The reservoir and master cylinder fluid is pumped out by the pump, through the damping chamber, to the front and rear calipers.

Scheme 18

VSA NO valve closed, VSA NC valve open, inlet valve closed, outlet valve closed, pump motor ON.

Front and rear caliper fluid is retained by the inlet valve and outlet valve.

Scheme 19

VSA NO valve closed, VSA NC valve open, inlet valve closed, outlet valve open, pump motor ON.

Caliper fluid flows through the outlet valve to the reservoir.

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then disconnect the HDS.
4. Test-drive the vehicle at 19 mph (30 km/h) or more.
5. Check for DTCs with the HDS. Is DTC 11, 13, 15, or 17 indicated? YES - Go to step 6. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
6. Turn the ignition switch OFF.
7. Disconnect the VSA modulator-control unit 47P connector.
8. Start the engine.
9. Measure the voltage between body ground and the appropriate wheel sensor +B and GND terminals of the VSA modulator-control unit 47P connector individually (see table). DTC TERMINAL REFERENCE DTC Appropriate Terminal +B GND 11 (Right-front) FR+B: No. 18 FR-GND: No. 17 13 (Left-front) FL+B: No. 4 FL-GND: No. 20 15 (Right-rear) RR +B: No. 5 RR-GND: No. 6 17 (Left-rear) RL+B: No. 2 RL-GND: No. 3 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 sensor. NO - Go to step 10.
10. Turn the ignition switch OFF.
11. Check for continuity between body ground and the appropriate wheel sensor +B and GND terminals of the VSA modulator-control unit 47P connector individually (see table). DTC TERMINAL REFERENCE DTC Appropriate Terminal +B GND 11 (Right-front) FR+B: No. 18 FR-GND: No. 17 13 (Left-front) FL+B: No. 4 FL-GND: No. 20 15 (Right-rear) RR+B: No. 5 RR-GND: No. 6 17 (Left-rear) RL+B: No. 2 RL-GND: No. 3 Is there continuity? YES - Go to step 12. NO - Go to step 14 .
12. Disconnect the appropriate wheel sensor 2P connector.
13. Check for continuity between body ground and the appropriate wheel sensor +B and GND terminals of the VSA modulator-control unit 47P connector individually (see table). DTC TERMINAL REFERENCE DTC Appropriate Terminal +B GND 11 (Right-front) FR +B: No. 18 FR-GND: No. 17 13 (Left-front) FL +B: No. 4 FL-GND: No. 20 15 (Right-rear) RR +B: No. 5 RR-GND: No. 6 17 (Left-rear) RL+B: No. 2 RL-GND: No. 3 Is there continuity? YES - Repair short to body ground in the wire between the VSA modulator-control unit and the wheel sensor. NO - Replace the appropriate wheel sensor (see «WHEEL SENSOR REPLACEMENT»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__wheel-sensor-replacement) ).
14. Disconnect the appropriate wheel sensor 2P connector.
15. Check for continuity between the appropriate wheel sensor +B and GND terminals of the VSA modulator-control unit 47P connector (see table). DTC TERMINAL REFERENCE DTC Appropriate Terminal +B GND 11 (Right-front) FR+B: No. 18 FR-GND: No. 17 13 (Left-front) FL+B: No. 4 FL-GND: No. 20 15 (Right-rear) RR +B: No. 5 RR-GND: No. 6 17 (Left-rear) RL+B: No. 2 RL-GND: No. 3 Is there continuity? YES - Repair short in the wires between the VSA modulator-control unit and the wheel sensor. NO - Go to step 16.
16. Connect wheel sensor 2P connector terminals No. 1 and No. 2 to body ground with a jumper wire. DTC TERMINAL REFERENCE DTC Appropriate Wheel Sensor 11 Right-front 13 Left-front 15 Right-rear 17 Left-rear
17. Check for continuity between body ground and the appropriate wheel sensor +B and GND terminals of the VSA modulator-control unit 47P connector individually (see table). DTC TERMINAL REFERENCE DTC Appropriate Terminal +B GND 11 (Right-front) FR+B: No. 18 FR-GND: No. 17 13 (Left-front) FL+B: No. 4 FL-GND: No. 20 15 (Right-rear) RR+B: No. 5 RR-GND: No. 6 17 (Left-rear) RL+B: No. 2 RL-GND: No. 3 Is there continuity? YES - Go to step 18. NO - Repair open in the wire between the VSA modulator-control unit and the wheel sensor.
18. Substitute a known-good wheel sensor for the appropriate wheel sensor (see table). DTC TERMINAL REFERENCE DTC Appropriate Wheel Sensor 11 Right-front 13 Left-front 15 Right-rear 17 Left-rear
19. Reconnect all connectors.
20. Turn the ignition switch ON (II).
21. Clear the DTC with the HDS.
22. Turn the ignition switch OFF, then disconnect the HDS.
23. Test-drive the vehicle at 19 mph (30 km/h) or more.
24. 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 47P connector. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ), and retest. NO - Replace the original wheel sensor (see «WHEEL SENSOR REPLACEMENT»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__wheel-sensor-replacement) ).

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

Note. If the ABS and VSA indicators come on because of electrical noise, the indicator goes off when you test-drive the vehicle at 19 mph (30 km/h) and the system returns to normal.

Scheme 30

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then disconnect the HDS.
4. Test-drive the vehicle at 19 mph (30 km/h) or more.
5. Check for DTCs with the HDS. Is DTC 12, 14, 16, or 18 indicated? YES - Go to step 6. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
6. Turn the ignition switch OFF.
7. Check the appropriate wheel sensor and magnetic encoder (see «WHEEL SENSOR INSPECTION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). DTC TERMINAL REFERENCE DTC Appropriate Wheel Sensor 12 Right-front 14 Left-front 16 Right-rear 18 Left-rear Are they OK? YES - Go to step 8. NO - Clean and reinstall, or replace the appropriate wheel sensor or magnetic encoder.
8. Disconnect the VSA modulator-control unit 47P connector.
9. Check for continuity between the appropriate wheel sensor +B terminal and other wheel sensor +B terminals (see table). DTC TERMINAL REFERENCE DTC Appropriate Terminal Other Terminals 12 FR+B: No. 18 No. 4 No. 5 No. 2 14 FL+B: No. 4 No. 18 No. 5 No. 2 16 RR+B: No. 5 No. 18 No. 4 No. 2 18 RL+B: No. 2 No. 18 No. 4 No. 5 Is there continuity? YES - Repair short in the wire between the appropriate wheel sensor and the other wheel sensor. NO - Go to step 10.
10. Substitute a known-good wheel sensor for the appropriate wheel sensor. DTC TERMINAL REFERENCE DTC Appropriate Wheel Sensor 12 Right-front 14 Left-front 16 Right-rear 18 Left-rear
11. Reconnect the VSA modulator-control unit 47P connector.
12. Turn the ignition switch ON (II).
13. Clear the DTC with the HDS.
14. Turn the ignition switch OFF, then disconnect the HDS.
15. Test-drive the vehicle at 19 mph (30 km/h) or more.
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 47P connector. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ), and retest. NO - Replace the original wheel sensor (see «WHEEL SENSOR REPLACEMENT»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__wheel-sensor-replacement) ).

DTC 21, 22: Magnetic Encoder (Wheel Bearing); DTC 23, 24: Magnetic Encoder (Hub Bearing Unit)

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then disconnect the HDS.
4. Test-drive the vehicle at 19 mph (30 km/h) or more.
5. Check for DTCs with the HDS. Is DTC 21, 22,23, or 24 indicated? YES - Go to step 6. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
6. Turn the ignition switch OFF.
7. Check the appropriate wheel sensor/encoder (see table) (see «WHEEL SENSOR INSPECTION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). DTC TERMINAL REFERENCE DTC Appropriate Wheel Sensor 21 Right-front 22 Left-front 23 Right-rear 24 Left-rear Are the sensor and encoder OK? YES - Check for loose terminals in the VSA modulator-control unit 47P connector. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ), and retest. NO - Clean and reinstall or replace the magnetic encoder: Front: Wheel bearing replacement (see «WHEEL BEARING REPLACEMENT»(/acura/tsx/i-2003-2008/remont/suspension-front/#front-suspension) ) Rear: Hub bearing unit replacement (see «HUB BEARING UNIT REPLACEMENT»(/acura/tsx/i-2003-2008/remont/wheel-hubs/#rear-suspension) )

DTC 25: Yaw Rate Sensor

Note. If DTC 27 or DTC 64 is stored at the same time as DTC 25, troubleshoot DTC 27 or DTC 64 first, then recheck for DTC 25.

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then disconnect the HDS.
4. Test-drive the vehicle around a number of corners.
5. Check for DTCs with the HDS. Is DTC 25 indicated? YES - Go to step 6. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
6. Turn the ignition switch OFF.
7. Disconnect the VSA modulator-control unit 47P connector, steering angle sensor 5P connector and yaw rate-lateral acceleration sensor 5P connector.
8. Turn the ignition switch ON (II).
9. Measure the voltage between body ground and VSA modulator-control unit 47P connector terminals No. 33, No. 34, and No. 35 individually. Is there 0.1 V or more? YES - Repair short to power in the wire between the VSA modulator-control unit and the yaw rate-lateral acceleration sensor. NO - Go to step 10.
10. Turn the ignition switch OFF.
11. Check for continuity between body ground and VSA modulator-control unit 47P connector terminals No. 33, No. 34, and No. 35 individually. Is there continuity? YES - Repair short to body ground in the wire between the VSA modulator-control unit and the yaw rate-lateral acceleration sensor. NO - Go to step 12.
12. Check for continuity between VSA modulator-control unit 47P connector terminal No. 35 and yaw rate-lateral acceleration sensor 5P connector terminal No. 2. Is there continuity? YES - Go to step 13. NO - Repair open in the wire between the VSA modulator-control unit and the yaw rate-lateral acceleration sensor.
13. Check for continuity between VSA modulator-control unit 47P connector terminal No. 33 and yaw rate-lateral acceleration sensor 5P connector terminal No. 4. Is there continuity? YES - Go to step 14. NO - Repair open in the wire between the VSA modulator-control unit and the yaw rate-lateral acceleration sensor.
14. Check for continuity between VSA modulator-control unit 47P connector terminal No. 34 and yaw rate-lateral acceleration sensor 5P connector terminal No. 3. Is there continuity? YES - Go to step 15. NO - Repair open in the wire between the VSA modulator-control unit and the yaw rate-lateral acceleration sensor.
15. Substitute a known-good yaw rate-lateral acceleration sensor (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-lateral-acceleration-sensor-replacement) ).
16. Reconnect all connectors.
17. Turn the ignition switch ON (II).
18. Clear the DTC with the HDS.
19. Turn the ignition switch OFF, then disconnect the HDS.
20. Test-drive the vehicle around a number of corners.
21. Check for DTCs with the HDS. Is DTC 25 indicated? YES - Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - Replace the original yaw rate-lateral acceleration sensor (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-lateral-acceleration-sensor-replacement) ).

DTC 26: Lateral Acceleration Sensor

Note. If DTC 64 is stored at the same time as DTC 26, troubleshoot DTC 64 first, then recheck for DTC 26.

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then disconnect the HDS.
4. Test-drive the vehicle around a number of corners.
5. Check for DTCs with the HDS. Is DTC 26 indicated? YES - Go to step 6. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
6. Turn the ignition switch OFF.
7. Disconnect the VSA modulator-control unit 47P connector, steering angle sensor 5P connector and yaw rate-lateral acceleration sensor 5P connector.
8. Turn the ignition switch ON (II).
9. Measure the voltage between body ground and VSA modulator-control unit 47P connector terminals No. 33, No. 35, and No. 37 individually. Is there 0.1 V or more? YES - Repair short to power in the wire between the VSA modulator-control unit and the yaw rate-lateral acceleration sensor. NO - Go to step 10.
10. Turn the ignition switch OFF.
11. Check for continuity between body ground and VSA modulator-control unit 47P connector terminals No. 33, No. 35, and No. 37 individually. Is there continuity? YES - Repair short to body ground in the wire between the VSA modulator-control unit and the yaw rate-lateral acceleration sensor. NO - Go to step 12.
12. Check for continuity between VSA modulator-control unit 47P connector terminal No. 35 and yaw rate-lateral acceleration sensor 5P connector terminal No. 2. Is there continuity? YES - Go to step 13. NO - Repair open in the wire between the VSA modulator-control unit and the yaw rate-lateral acceleration sensor.
13. Check for continuity between VSA modulator-control unit 47P connector terminal No. 33 and yaw rate-lateral acceleration sensor 5P connector terminal No. 4. Is there continuity? YES - Go to step 14. NO - Repair open in the wire between the VSA modulator-control unit and the yaw rate-lateral acceleration sensor.
14. Check for continuity between VSA modulator-control unit 47P connector terminal No. 37 and yaw rate-lateral acceleration sensor 5P connector terminal No. 5. Is there continuity? YES - Go to step 15. NO - Repair open in the wire between the VSA modulator-control unit and the yaw rate-lateral acceleration sensor.
15. Substitute a known-good yaw rate-lateral acceleration sensor.
16. Reconnect all connectors.
17. Turn the ignition switch ON (II).
18. Clear the DTC with the HDS.
19. Turn the ignition switch OFF, then disconnect the HDS.
20. Test-drive the vehicle around a number of corners.
21. Check for DTCs with the HDS. Is DTC 26 indicated? YES - Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - Replace the original yaw rate-lateral acceleration sensor (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-lateral-acceleration-sensor-replacement) ).

DTC 27: Steering Angle Sensor

Note. If DTC 64 is stored at the same time as DTC 27, troubleshoot DTC 64 first, then recheck for DTC 27.

Scheme 41

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then disconnect the HDS.
4. Test-drive the vehicle around a number of corners.
5. Check for DTCs with the HDS. Is DTC 27 indicated? YES - Go to step 6. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
6. Turn the ignition switch OFF.
7. Disconnect the VSA modulator-control unit 47P connector, steering angle sensor 5P connector and yaw rate-lateral acceleration sensor 5P connector.
8. Turn the ignition switch ON (II).
9. Measure the voltage between body ground and VSA modulator-control unit 47P connector terminals No. 33 and No. 35 individually. Is there 0.1 V or more? YES - Repair short to power in the wire between the VSA modulator-control unit and the steering angle sensor. NO - Go to step 10.
10. Measure the voltage between body ground and VSA modulator-control unit 47P connector terminals No. 28, No. 29, No. 43 individually. Is there 0.1 V or more? YES - Repair short to power in the wire between the VSA modulator-control unit and the steering angle sensor. NO - Go to step 11.
11. Turn the ignition switch OFF.
12. Check for continuity between body ground and VSA modulator-control unit 47P connector terminals No. 33 and No. 35 individually. Is there continuity? YES - Repair short to body ground in the wire between the VSA modulator-control unit and the steering angle sensor. NO - Go to step 13.
13. Check for continuity between body ground and VSA modulator-control unit 47P connector terminals No. 28, No. 29, and No. 43 individually. Is there continuity? YES - Repair short to body ground in the wire between the VSA modulator-control unit and the steering angle sensor. NO - Go to step 14.
14. Check for continuity between VSA modulator-control unit 47P connector terminals No. 33 and No. 35 and steering angle sensor 5P connector terminals No. 1 and No. 5 respectively. Is there continuity? YES - Go to step 15. NO - Repair open in the wire between the VSA modulator-control unit and the steering angle sensor.
15. Check for continuity between VSA modulator-control unit 47P connector terminals No. 28, No. 29, and No. 43 and steering angle sensor 5P connector terminals No. 2, No. 3, and No. 4 respectively. Is there continuity? YES - Go to step 16. NO - Repair open in the wire between the VSA modulator-control unit and the steering angle sensor.
16. Substitute a known-good steering angle sensor.
17. Reconnect all connectors.
18. Turn the ignition switch ON (II).
19. Clear the DTC with the HDS.
20. Turn the ignition switch OFF, then disconnect the HDS.
21. Test-drive the vehicle around a number of corners.
22. Check for DTCs with the HDS. Is DTC 27 indicated? YES - Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - Replace the original steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-replacement) ).

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

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then turn it ON (II) again.
4. Check for DTCs with the HDS. Is DTCs 31, 32, 33, 34, 35, 36, 37, or 38 indicated? YES - Check for loose terminals in the VSA modulator-control unit 47P connector. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ), and retest. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

DTC 41,42,43,44: Wheel Lock

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then disconnect the HDS.
4. Test-drive the vehicle, and check for brake drag by duplicating city driving at speeds over 30 mph (50 km/h). Use the brakes often. Do the brakes drag? YES - Repair the brake drag. NO - Go to step 5.
5. Check the installation of the appropriate wheel sensor (see «WHEEL SENSOR INSPECTION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). DTC TERMINAL REFERENCE DTC Appropriate Wheel Sensor 41 Right-front 42 Left-front 43 Right-rear 44 Left-rear Is it correct? YES - If the DTC does not reappear, the most probable cause for the DTC is that the vehicle might have lost traction on a slippery road and spun around. NO - Reinstall or replace the wheel sensor (see «WHEEL SENSOR REPLACEMENT»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__wheel-sensor-replacement) ).

Scheme 47

Scheme 48

1. Turn the ignition switch OFF.
2. Check the No. 17 (30 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Reinstall the fuse, and go to step 2. NO - Replace the fuse, and recheck.
3. Disconnect the VSA modulator-control unit 47P connector.
4. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 16 and body ground. Is there battery voltage? YES - Go to step 5. NO - Repair open in the wire between the No. 17 (30 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit.
5. Check for continuity between VSA modulator-control unit 47P connector terminal No. 47 and body ground. Is there continuity? YES - Go to step 6. NO - Repair open in the wire between the VSA modulator-control unit and body ground (G203).
6. Turn the ignition switch ON (II).
7. Clear the DTC with the HDS.
8. Turn the ignition switch OFF, then disconnect the HDS.
9. Test-drive the vehicle at 10 mph (15 km/h) or more.
10. Check for DTCs with the HDS. Is DTC 51 or 52 indicated? YES - Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

Scheme 49

1. Turn the ignition switch OFF.
2. Disconnect the VSA modulator-control unit 47P connector.
3. Check for continuity between VSA modulator-control unit 47P connector terminal No. 47 and body ground. Is there continuity? YES - Go to step 4. NO - Repair open in the wire between the VSA modulator-control unit and body ground (G203).
4. Reconnect the VSA modulator-control unit 47P connector.
5. Turn the ignition switch ON (II).
6. Clear the DTC with the HDS.
7. Turn the ignition switch OFF, then disconnect the HDS.
8. Test-drive the vehicle.
9. Check for DTCs with the HDS. Is DTC 53 indicated? YES - Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

Scheme 50

1. Turn the ignition switch OFF.
2. Disconnect the VSA modulator-control unit 47P connector.
3. Check for continuity between VSA modulator-control unit 47P connector terminal No. 47 and body ground. Is there continuity? YES - Go to step 4. NO - Repair open in the wire between the VSA modulator-control unit and body ground (G203).
4. Reconnect the VSA modulator-control unit 47P connector.
5. Turn the ignition switch ON (II).
6. Clear the DTC with the HDS.
7. Turn the ignition switch OFF, then disconnect the HDS.
8. Test-drive the vehicle.
9. Check for DTCs with the HDS. Is DTC 54 indicated? YES - Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures)

DTC 61: Low +B-FSR Voltage; DTC 62: High +B-FSR Voltage

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then turn it ON (II) again. Does the ABS indicator come on? YES - Go to step 4. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
4. Check for DTCs with the HDS. Is DTC 61 or 62 indicated? YES - Check the battery (see «BATTERY TEST»(/acura/tsx/i-2003-2008/remont/body-electrical/#battery) ) and the charging system: '04-05 models (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ), '06-08 models (see «'06-08 MODELS»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ). NO - Do the appropriate troubleshooting for the DTC indicated.

Scheme 51

Scheme 52

1. Turn the ignition switch OFF.
2. Disconnect the VSA modulator-control unit 47P connector, the steering angle sensor 5P connector, and the yaw rate-lateral acceleration sensor 5P connector.
3. Start the engine.
4. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 35 and body ground. Is there 0.1 V or more? YES - Repair short to power in the wire between the VSA modulator-control unit and yaw rate-lateral acceleration sensor and steering angle sensor. NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Check for continuity between the VSA modulator-control unit 47P connector terminal No. 35 and body ground. Is there continuity? YES - Repair short to body ground in the wire between the VSA modulator-control unit and yaw rate-lateral acceleration sensor and steering angle sensor. NO - Go to step 7.
7. Reconnect all connectors.
8. Turn the ignition switch ON (II).
9. Clear the DTC with the HDS.
10. Turn the ignition switch OFF, then disconnect the HDS.
11. Test-drive the vehicle.
12. Check for DTCs with the HDS. Is DTC 64 indicated? YES - Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) . Check connections at the VSA modulator-control unit 47P connector and G203.

Scheme 53

1. Turn the ignition switch OFF.
2. Check the brake fluid level. Is the level correct? YES - Go to step 3. NO - Inspect the brake system for fluid leaks, if no leaks are found, replace all worn out brake pads.
3. Disconnect the gauge control module connector A (22P), and brake fluid level switch 2P connector.
4. Check for continuity between brake fluid level switch 2P connector terminal No. 2 and body ground. Is there continuity? YES - Repair short to body ground in the wire between the gauge control module and the brake fluid level switch. NO - Go to step 5.
5. Check the brake fluid level switch (see «BRAKE FLUID LEVEL SWITCH TEST»(/acura/tsx/i-2003-2008/remont/mechanical-hydraulic/#conventional-brake-components__brake-fluid-level-switch-test) ). Is the switch OK? YES - Do the troubleshooting for the gauge control module (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ). NO - Replace the brake fluid level switch.

DTC 66: VSA Pressure Sensor (Inside of VSA Modulator-control Unit)

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then disconnect the HDS.
4. Test-drive the vehicle.
5. Check for DTCs with the HDS. Is DTC 66 indicated? YES - Go to step 6. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
6. Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-sensor-neutral-position-memorization) ).
7. Clear the DTC with the HDS.
8. Turn the ignition switch OFF, then disconnect the HDS.
9. Test-drive the vehicle.
10. Check for DTCs with the HDS. Is DTC 66 indicated? YES - Check for loose terminals in the VSA modulator-control unit 47P connector. If no loose terminals are found, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

DTC 68: Brake Pedal Position Switch

1. Turn the ignition switch ON (II).
2. Check for the fuel and emission systems (PGM-FI) DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/i-2003-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ). Are any ECM/PCM DTCs indicated? YES - Do the appropriate troubleshooting for the DTC. NO - Go to step 3.
3. Check the brake pedal position switch (see «BRAKE PEDAL POSITION SWITCH TEST»(/acura/tsx/i-2003-2008/remont/exterior-lights/#exterior-light-system) ). Is the brake pedal position switch OK? YES - Go to step 4. NO - Replace the brake pedal position switch (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/tsx/i-2003-2008/remont/mechanical-hydraulic/#conventional-brake-components) ).
4. Clear the DTC with the HDS.
5. Turn the ignition switch OFF, then disconnect the HDS.
6. Test-drive the vehicle.
7. Check for DTCs with the HDS. Is DTC 68 indicated? YES - Go to step 8. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
8. Troubleshoot the brake pedal position switch signal circuit (see «BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/engine-control-systems/#idle-control-system) ). Is the brake pedal position switch circuit OK? YES - Substitute a known-good ECM/PCM, and retest: If the problem is gone, replace the original ECM/PCM. If the problem continues, check for loose terminals in the VSA modulator-control unit 47P connector. If no loose terminals are found, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - Repair the brake pedal position switch circuit.

DTC 71: Different Diameter Tire

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then disconnect the HDS.
4. Test-drive the vehicle.
5. Check for DTCs with the HDS. Is DTC 71 indicated? YES - Go to step 6. NO - The vehicle is OK at this time. Refer to «INTERMITTENT FAILURE»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) . Confirm that tire inflation is set to spec.
6. Check that all four tires are the specified size, are inflated to the proper specification and worn evenly (see «WHEEL ALIGNMENT»(/acura/tsx/i-2003-2008/remont/wheel-alignment/#front-suspension-and-rear-suspension-alignment__wheel-alignment) ). Are all four tires the correct size, properly inflated and worn evenly? YES - Go to step 7. NO - Install the correct tires or set the tires to the correct inflation, and retest.
7. With the vehicle on level ground, mark each tire with a small spot of grease. Roll the vehicle until each of the tires makes two grease spots on the floor.
8. Measure and record the distance between the two grease spots. Is the distance between the shortest and the longest measurement more than 8.5 %? YES - Replace the tire/tires that is smaller or larger than the others. NO - Check for loose terminals in the VSA modulator-control unit 47P connector. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ), and retest.

Scheme 54

Scheme 55

1. Turn the ignition switch ON (II).
2. Check for the fuel and emission systems (PGM-FI) DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/i-2003-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ). Are any ECM/PCM DTCs indicated? YES - Do the appropriate troubleshooting for the DTC. NO - Go to step 3.
3. Clear the DTC with the HDS.
4. Turn the ignition switch OFF, then disconnect the HDS.
5. Test-drive the vehicle.
6. Check for DTCs with the HDS. Is DTC 81 indicated? YES - Go to step 8 . NO - The vehicle is OK at this time. Refer to «INTERMITTENT FAILURE»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
7. Turn the ignition switch OFF.
8. Disconnect the VSA modulator-control unit 47P connector, the steering angle sensor 5P connector, and yaw rate-lateral acceleration sensor 5P connector.
9. Start the engine.
10. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 35 and body ground. Is there 0.1 V or more? YES - Repair short to power in the wire between the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, and the steering angle sensor. NO - Go to step 11.
11. Check for continuity between VSA modulator-control unit 47P connector terminal No. 35 and body ground. Is there continuity? YES - Repair short to body ground in the wire between the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, and the steering angle sensor. NO - Check for loose terminals in the VSA modulator-control unit 47P connector. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ), and retest.

DTC 83: ECM/PCM

1. Turn the ignition switch ON (II).
2. Check for the DTCs with the HDS. Is DTC 86 indicated? YES - Do the troubleshooting for DTC 86 (see «DTC 86: F-CAN COMMUNICATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__dtc-86-f-can-communication) ). NO - Go to step 3.
3. Clear the DTC with the HDS.
4. Turn the ignition switch OFF, then disconnect the HDS.
5. Test-drive the vehicle.
6. Check for DTCs with the HDS. Is DTC 83 indicated? YES - Go to step 7. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
7. Check for the fuel and emission systems (PGM-FI) DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/i-2003-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ). Are any ECM/PCM DTCs indicated? YES - Do the applicable troubleshooting for the ECM/PCM. NO - A/T: Go to step 8. M/T: Check for loose terminals at the ECM connectors, and go to step 9 .
8. Check for the A/T systems DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/i-2003-2008/remont/automatic-trans/#automatic-transmission) ). Are any ECM/PCM DTCs indicated? YES - Do the applicable troubleshooting for the PCM. NO - Check for loose terminals at the PCM connectors, and go to step 9.
9. Clear the DTC with the HDS.
10. Turn the ignition switch OFF, then disconnect the HDS.
11. Test-drive the vehicle.
12. Check the VSA system and fuel and emission systems (PGM-FI) for DTCs with the HDS. Is DTC 83 indicated and no ECM/PCM's DTC? YES - Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

DTC 84: VSA Sensor Neutral Position

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then disconnect the HDS.
4. Test-drive the vehicle.
5. Check for DTCs with the HDS. Is DTC 84 indicated? YES - Go to step 6. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
6. Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-sensor-neutral-position-memorization) ).
7. Clear the DTC with the HDS.
8. Turn the ignition switch OFF, then disconnect the HDS.
9. Test-drive the vehicle.
10. Check for DTCs with the HDS. Is DTC 84 indicated? YES - Check for loose terminals in the VSA modulator-control unit 47P connector. If no loose terminals are found, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

DTC 86: F-CAN Communication

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start and run the engine for at least 5 seconds then turn the engine off.
4. Check for DTCs with the HDS. Is DTC 86 indicated? YES - Go to step 5. NO - The F-CAN communication line is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
5. Check for the fuel and emission systems (PGM-FI) DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/i-2003-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ). Are any ECM/PCM DTCs indicated? YES - Do the applicable troubleshooting for the DTC. NO - Check for loose terminals in the VSA modulator-control unit 47P connector. If no loose terminals are found, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).

DTC 107: TCS Operation; DTC 108: VSA Operation

Note. The ABS/VSA indicators do not come on by memorizing the DTC 107 or DTC 108.

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then disconnect the HDS.
4. Test-drive the vehicle.
5. Check for DTCs with the HDS. Is DTC 107 or DTC 108 indicated ? YES - Check for loose terminals in the VSA modulator-control unit 47P connector. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ), and retest. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

DTC 112: Internal Power Source Stuck OFF

Note. If the battery cable was disconnected three times with the ignition switch ON (II), this DTC may be stored.

Scheme 56

1. Turn the ignition switch ON (II).
2. Check for other DTCs with the HDS. Is another DTC indicated ? YES - Do the appropriate troubleshooting for the DTC. NO - Go to step 3.
3. Clear the DTC with the HDS.
4. Turn the ignition switch OFF, then disconnect the HDS.
5. Test-drive the vehicle.
6. Check for DTCs with the HDS. Is DTC 112 indicated? YES - Go to step 7. NO - The vehicle is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .
7. Turn the ignition switch OFF.
8. Inspect G203 for a clean and tight connection. Is G203 clean and properly connected? YES - Go to step 9. NO - Repair the connection at G203.
9. Disconnect the VSA modulator-control unit 47P connector.
10. Check for continuity between body ground and VSA modulator-control unit 47P connector terminals No. 32 and No. 47 individually. Is there continuity? YES - Check for loose terminals in the VSA modulator-control unit 47P connector. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/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 body ground (G203).

DTC 121,122,123,124: VSA Solenoid

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then disconnect the HDS.
4. Test-drive the vehicle.
5. 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 47P connector. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ), and retest. NO - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) .

ABS indicator does not come on

1. Turn the ignition switch ON (II), and watch the ABS indicator. Does the ABS indicator come on for several seconds and then go off? YES - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) . NO - Go to step 2.
2. Do the gauge control module self-diagnosis function procedure (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ). Is the gauge control module OK? YES - Go to step 3. NO - Replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
3. Turn the ignition switch OFF.
4. Substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
5. Turn the ignition switch ON (II). Does the ABS indicator come on? YES - Replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - Check for loose terminals in the gauge control module connectors. If connections are good, replace the gauge control module.

Scheme 57

Scheme 58

Scheme 59

1. Turn the ignition switch OFF.
2. Check the No. 18(40 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Reinstall the fuse, and go to step 3. NO - Replace the fuse, and recheck. If the fuse is blown, check for a short to body ground in this fuse circuit. If the circuit is OK, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
3. Check the No. 18 (15 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Reinstall the fuse, and go to step 4. NO - Replace the fuse, and recheck. If the fuse is blown, check for a short to body ground in this fuse circuit. If the circuit is OK, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
4. Disconnect the VSA modulator-control unit 47P connector.
5. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 6. NO - Repair open in the wire between the No. 18 (40 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit.
6. Turn the ignition switch ON (II).
7. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 38 and body ground. Is there battery voltage? YES - Go to step 8. NO - Repair open in the wire between the No. 18 (15 A) fuse in the under-dash fuse/relay box and the VSA modulator-control unit.
8. Turn the ignition switch OFF.
9. Check for continuity between VSA modulator-control unit 47P connector terminal No. 32 and body ground. Is there continuity? YES - Check for loose terminals in the VSA modulator-control unit 47P connector. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/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 body ground (G203).

Brake system indicator does not come on

1. Turn the ignition switch ON (II), and watch the brake system indicator. Does the brake system indicator come on for several seconds? YES - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) . NO - Go to step 2.
2. Do the gauge control module self-diagnosis function procedure (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ). Is the gauge control module OK? YES - Go to step 3. NO - Replace gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
3. Turn the ignition switch OFF.
4. Substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
5. Turn the ignition switch ON (II). Does the brake system indicator come on? YES - Replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - Check for loose terminals in the gauge control module connectors. If connections are good, replace the gauge control module.

Scheme 60

Scheme 61

1. Turn the ignition switch ON (II).
2. Release the parking brake. Does the brake system indicator go off after several seconds? YES - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) . NO - Go to step 3.
3. Check the brake fluid level (see «BRAKE SYSTEM BLEEDING»(/acura/tsx/i-2003-2008/remont/mechanical-hydraulic/#conventional-brake-components__brake-system-bleeding) ). Is the level OK? YES - Go to step 4. NO - Inspect the brake system for fluid leaks, if no leaks are found, replace the worn out brake pads.
4. Check the ABS indicator. Does the ABS indicator stay on? YES - Read the DTC (see «HOW TO RETRIEVE DTCS»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ), and do the applicable troubleshooting for the DTC. NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Check the parking brake switch (see «PARKING BRAKE SWITCH TEST»(/acura/tsx/i-2003-2008/remont/mechanical-hydraulic/#conventional-brake-components__parking-brake-switch-test) ). Is the parking brake switch OK? YES - Go to step 7. NO - Replace the parking brake switch.
7. Check the brake fluid level switch (see «BRAKE FLUID LEVEL SWITCH TEST»(/acura/tsx/i-2003-2008/remont/mechanical-hydraulic/#conventional-brake-components__brake-fluid-level-switch-test) ). Is the brake fluid level switch OK? YES - Go to step 8. NO - Replace the brake fluid level switch.
8. Remove the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
9. Disconnect the gauge control module connector A (22P).
10. Check for continuity between the gauge control module connector A (22P) terminal No. 4 and body ground. Is there continuity? YES - Repair short to body ground in the wire between the gauge control module and the parking brake switch. NO - Go to step 11.
11. Check for continuity between the gauge control module connector A (22P) terminal No. 2 and body ground. Is there continuity? YES - Repair short to body ground in the wire between the gauge control module and the brake fluid level switch. NO - Check for loose terminals in the gauge control module connectors. If connections are good, replace the gauge control module.

VSA indicator does not come on

1. Turn the ignition switch ON (II), and watch the VSA indicator. Does the VSA indicator come on for several seconds? YES - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) . NO - Go to step 2.
2. Do the gauge control module self-diagnosis function procedure (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ). Is the gauge control module OK? YES - Go to step 3. NO - Replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
3. Turn the ignition switch OFF.
4. Substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
5. Turn the ignition switch ON (II). Does the VSA indicator come on? YES - Replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - Check for loose terminals in the gauge control module connectors. If connections are good, replace the gauge control module.

Scheme 62

Scheme 63

Scheme 64

1. Turn the ignition switch OFF.
2. Check the No. 18 (40 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Reinstall the fuse, and go to step 3. NO - Replace the fuse, and recheck. If the fuse is blown, check for a short to body ground in this fuse circuit. If the circuit is OK, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
3. Check the No. 18(15 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Reinstall the fuse, and go to step 4. NO - Replace the fuse, and recheck. If the fuse is blown, check for a short to body ground in this fuse circuit. If the circuit is OK, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
4. Disconnect the VSA modulator-control unit 47P connector.
5. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 6. NO - Repair open in the wire between the No. 18 (40 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit.
6. Turn the ignition switch ON (II).
7. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 38 and body ground. Is there battery voltage? YES - Go to step 8. NO - Repair open in the wire between the No. 18 (15 A) fuse in the under-dash fuse/relay box and the VSA modulator-control unit.
8. Turn the ignition switch OFF.
9. Check for continuity between VSA modulator-control unit 47P connector terminal No. 32 and body ground. Is there continuity? YES - Check for loose terminals in the VSA modulator-control unit 47P connector. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/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 body ground (G203).

VSA activation indicator does not come on at start-up (bulb check)

1. Turn the ignition switch ON (II), and watch the VSA activation indicator. Does the VSA activation indicator come on for several seconds? YES - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) . NO - Go to step 2.
2. Do the gauge control module self-diagnosis function procedure (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ). Is the gauge control module OK? YES - Go to step 3. NO - Replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
3. Turn the ignition switch OFF.
4. Substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
5. Turn the ignition switch ON (II). Does the VSA activation indicator come on? YES - Replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - Check for loose terminals in the gauge control module connectors. If connections are good, replace the gauge control module.

Scheme 65

Scheme 66

1. Turn the ignition switch ON (II), and watch the VSA activation indicator. Does the VSA activation indicator go off? YES - Go to step 2. NO - Do the appropriate troubleshooting for the VSA indicator.
2. Turn the ignition switch OFF.
3. Check the VSA OFF switch (see «VSA OFF SWITCH TEST»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). Is the VSA OFF switch OK? YES - Go to step 4. NO - Replace the VSA OFF switch (see «VSA OFF SWITCH TEST»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ).
4. Turn the ignition switch ON (II).
5. Clear the DTC with the HDS. Does the VSA activation indicator go off? YES - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) . NO - Go to step 6.
6. Do the VSA sensor neutral memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-sensor-neutral-position-memorization) ).
7. Clear the DTC with the HDS. Does the VSA activation indicator go off? YES - The system is OK at this time. Refer to «INTERMITTENT FAILURES»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__intermittent-failures) . NO - Go to step 8.
8. Turn the ignition switch OFF.
9. Remove and disconnect the gauge control module connectors (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
10. Disconnect the VSA OFF switch 5P connector.
11. Check for continuity between VSA OFF switch 5P connector terminal No. 2 and body ground. Is there continuity? YES - Repair short to body ground in the wire between the gauge control module and the VSA OFF switch. NO - Go to step 12.
12. Reconnect all of connectors.
13. Turn the ignition switch ON (II).
14. Measure the voltage between VSA OFF switch 5P connector terminal No. 1 and body ground. Is there less than 0.1 V? YES - Go to step 15. NO - Repair open in the wire between the VSA OFF switch and body ground (G501).
15. Substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
16. Clear the DTC with the HDS.
17. Turn the ignition switch OFF, then disconnect the HDS.
18. Test-drive the vehicle. Does the VSA activation indicator go off? YES - Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - Check for loose terminals in the gauge control module connectors. If necessary, substitute a known-good gauge control module, and retest.

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 67

1. Remove the steering wheel (see «STEERING WHEEL REMOVAL»(/acura/tsx/i-2003-2008/remont/manual-power-steering/#power-steering-system__steering-wheel-removal) ).
2. Remove the steering column covers and the cable reel (see «CABLE REEL REPLACEMENT»(/acura/tsx/i-2003-2008/remont/airbag/#srs-supplemental-restraint-system) ).
3. Remove the combination switch (see «STEERING COLUMN REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/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/tsx/i-2003-2008/remont/airbag/#srs-supplemental-restraint-system) ).

Yaw Rate-Lateral Acceleration Sensor Replacement

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

Scheme 68

1. Turn the ignition switch OFF.
2. Remove the driver's seat (see «FRONT SEAT REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/seats/#seat-system__front-seat-removalinstallation) ).
3. Lift up the carpet (A).
4. Remove the sensor cover (B).
5. Remove the yaw rate-lateral acceleration sensor (C) with the bracket (D).
6. Remove the bracket.
7. Install the sensor in the reverse order of removal.
8. Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-sensor-neutral-position-memorization) ).

VSA Sensor Neutral Position Memorization

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

Scheme 69

1. Park the vehicle on a flat and level surface.
2. With the ignition switch OFF, connect the HDS to the data link connector (DLC) (A) under the driver's side of the dashboard.
3. Turn the ignition switch ON (II).
4. '07-08 models: Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't, troubleshoot the DLC circuit (see «'07-08 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ).
5. Do the VSA sensor neutral position memorization in the VSA ADJUSTMENT with the HDS. NOTE: See the HDS Help menu for specific instructions.
6. Turn the ignition switch OFF.

Scheme 70

1. Park the vehicle on a flat and level surface.
2. With the ignition switch OFF, connect the HDS to the date link connector (DLC) (A) under the driver's side of the dashboard.
3. Turn the ignition switch ON (II).
4. '07-08 models: Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't, troubleshoot the DLC circuit (see «'07-08 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ).
5. Short the SCS circuit to body ground using the HDS.
6. Turn the ignition switch ON (II) with the brake pedal released.
7. The ABS indicator comes on for 2 seconds and goes off.
8. After the ABS indicator goes off, press and release the VSA OFF switch once within 0.5 seconds.
9. After the ABS indicator comes on, press and release the VSA OFF switch once within 0.5 seconds.
10. The VSA activation indicator blinks two times and goes off in 1 second, then the system completes the VSA sensor neutral position memorization.
11. When the ABS indicator, VSA indicator and VSA activation indicator go off, the memorizing is done. If the indicators do not go off, retry these steps.
12. Turn the ignition switch OFF, then disconnect the HDS.

Scheme 71

Scheme 72

Scheme 73

1. Turn the ignition switch OFF.
2. Remove the switch panel (A), and disconnect the VSA OFF switch 5P connector (B).
3. Pull out the VSA OFF switch (C) from the switch panel.
4. Check for continuity between VSA OFF switch 5P connector terminal No. 1 and No. 2. There should be continuity when the switch is pressed, and no continuity when the switch is released.
5. Check for continuity between VSA OFF switch 5P connector terminal 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 74

1. Turn the ignition switch OFF.
2. Disconnect the VSA modulator-control unit 47P connector (A) by pushing the lock (B) and pulling up the lever (C); the connector disconnects itself.
3. Disconnect the six brake lines from the VSA modulator-control unit (D).
4. Remove the VSA modulator-control unit with the bracket (E) from the body.
5. Remove the VSA modulator-control unit from the bracket.

Installation

1. Install the VSA modulator-control unit on the bracket, then tighten the two 6 mm bolts and the hex bolt.
2. Install the VSA modulator-control unit/bracket on the body, then tighten the three 6 mm bolts.
3. Reconnect the six brake lines, then tighten the nuts.
4. Align the connecting surface of the VSA modulator-control unit 47P connector.
5. Carefully push in the lock of the VSA modulator-control unit 47P connector until you hear it click into place, then confirm the connector is fully seated.
6. Bleed the brake system, starting with the front wheels (see «BRAKE SYSTEM BLEEDING»(/acura/tsx/i-2003-2008/remont/mechanical-hydraulic/#conventional-brake-components__brake-system-bleeding) ).
7. Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tsx/i-2003-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-sensor-neutral-position-memorization) ).
8. Start the engine, and check that the ABS and VSA indicators go off.
9. Test-drive the vehicle, and check that the ABS and VSA indicators do not come on. NOTE: If the brake pedal is spongy, there maybe air trapped in the modulator and then induced in to the normal brake system during modulation. Bleed the brake system again (see «BRAKE SYSTEM BLEEDING»(/acura/tsx/i-2003-2008/remont/mechanical-hydraulic/#conventional-brake-components__brake-system-bleeding) ).

Scheme 75

Scheme 76

1. Clean the encoder, and make sure no metal is stuck to the encoder surface.
2. Check the magnetic encoder (A) for damage. If cracked or damaged, replace the encoder. Front: Wheel bearing replacement (see «WHEEL BEARING REPLACEMENT»(/acura/tsx/i-2003-2008/remont/suspension-front/#front-suspension) ) Rear: Hub bearing unit (see «KNUCKLE/HUB REPLACEMENT»(/acura/tsx/i-2003-2008/remont/suspension-front/#front-suspension) ) Front Rear
3. Measure the air gap between the wheel sensor (B) and the magnetic encoder all the way around while rotating the encoder. Standard: Front: 0.5-1.2 mm (0.02-0.05 in.) Rear: 0.4-1.1 mm (0.02-0.04 in.)

Wheel Sensor Replacement

Note. Install the sensor carefully to avoid twisting the wires.

Front

Scheme 77

Rear

Scheme 78

See also:
• BRAKE SYSTEM BLEEDING
• '07-08 MODELS
• WHEEL BEARING REPLACEMENT
• HUB BEARING UNIT REPLACEMENT
• BATTERY TEST
• CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING
• BRAKE FLUID LEVEL SWITCH TEST
• SELF-DIAGNOSTIC FUNCTION
• GENERAL TROUBLESHOOTING INFORMATION
• BRAKE PEDAL POSITION SWITCH TEST
• BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT
• BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING
• WHEEL ALIGNMENT
• GENERAL TROUBLESHOOTING INFORMATION
• GAUGE CONTROL MODULE REPLACEMENT
• PARKING BRAKE SWITCH TEST
• STEERING WHEEL REMOVAL
• CABLE REEL REPLACEMENT
• STEERING COLUMN REMOVAL AND INSTALLATION
• FRONT SEAT REMOVAL/INSTALLATION
• DTC TROUBLESHOOTING
• VSA SENSOR NEUTRAL POSITION MEMORIZATION
• 12
• 21
• 25
• 26
• 27
• 31
• 41
• 61
• 66
• 68
• 71
• 83
• 84
• 86
• 107
• 112
• 121
• ABS INDICATOR DOES NOT COME ON
• BRAKE SYSTEM INDICATOR DOES NOT COME ON
• VSA INDICATOR DOES NOT COME ON
• VSA ACTIVATION INDICATOR DOES NOT COME ON AT START-UP (BULB CHECK)
• INTERMITTENT FAILURES
• WHEEL SENSOR REPLACEMENT
• VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION
• YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT
• STEERING ANGLE SENSOR REPLACEMENT