Vsa (vehicle Stability Assist) System Components Acura TL IV

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System Indicator

This system has four indicators

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1. ABS indicator (A)
2. Brake system indicator (B)
3. VSA indicator (C)
4. VSA activation indicator (D) ('09 model)
5. VSA OFF indicator ('10-11 Model) (E) '09 model '10-11 model When the system detects a problem, it will turn the appropriate indicators on. Depending on the failure, the VSA modulator-control unit determines which indicators are turned on. When the system is OK, each indicator comes on for about 2 seconds after turning the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, then goes off.

ABS Indicator

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

Brake System Indicator

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

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

VSA Indicator

1. '09 model: The VSA indicator comes on when the VSA function is lost.
2. '10-11 model: The VSA indicator comes on when the VSA function is lost. The VSA indicator blinks when the VSA function is activating.

VSA Activation Indicator ('09 model)

The VSA activation indicator blinks when the VSA function is activating. The VSA activation indicator comes on and stays on when the VSA is turned OFF by using the VSA OFF switch, or when the VSA sensor neutral position is not memorized.

VSA OFF Indicator (10-11 model)

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

ABS and VSA Indicators go off

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

1. DTC 61, 62, 84-01, 84-12, 158: The indicators go off automatically when the system returns to normal.
2. DTC 25-28, 31-38, 54, 64-66, 68,81, 83, 86, 91, 104, 105, 111, 118, 121-124: The indicators stay on until the ignition switch is turned to LOCK (0), or when pressing the engine start/stop button to select the OFF mode, whether or not the system returns to normal.
3. DTC 11-18, 21-24, 51, 52: The indicators stay on until the vehicle is driven after the system returns to normal.

Diagnostic Trouble Code (DTC)

1. The memory can hold all 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 an EEPROM in the VSA modulator-control unit. Therefore, the memorized DTCs cannot be erased by disconnecting the battery. Do the specified procedures to clear the DTCs.

Self-diagnosis

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

Kickback

The pump motor operates when the VSA modulator-control unit is functioning, and the fluid in the 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 operation one time after completing initial diagnosis during regular diagnosis when the vehicle is driven over 9 mph (15 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 and/or VSA indicator is still on. Following a troubleshooting procedure for a code that has been cleared but does not reset can result in incorrect diagnosis.

Note. Always troubleshoot powertrain DTCs first.

1. Question the client about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting. Find out when the ABS and/or VSA indicator came on, such as during activation, after activation, when the vehicle was traveling at a certain speed, etc. If necessary, have the client demonstrate the concern.
2. When the ABS or VSA indicator does not come on during the test-drive, check for loose connectors, poor contact of the terminals, etc. in the circuit indicated by the DTC 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 and VSA indicators do not come on.
4. Check for DTCs from other systems which are connected via F-CAN. If there are DTCs that are related to F-CAN, one possible cause was that the ignition switch was turned to ON (II), or the engine start/stop button was pressed to select the ON mode with the VSA modulator-control unit connector disconnected. Clear the DTCs. Check for powertrain DTCs first.

Intermittent Failures

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

How to Use the HDS (Honda Diagnostic System)

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

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1. If the system indicators stay on, connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) .
4. Check the diagnostic trouble code (DTC) and the freeze data, for all systems, troubleshoot the powertrain DTCs first and note them. Then refer to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) , and do the appropriate troubleshooting procedure. NOTE: Freeze data indicates the VSA conditions when the first system malfunction that activated the indicator was detected. The HDS reads the DTC, the freeze data, the current data, and other system data. For specific operations, refer to the Help menu that came with the HDS.

How to Retrieve DTCs

1. With the ignition switch in LOCK (0) or vehicle in OFF mode, connect the HDS to the data link connector (DLC) under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 «DTC TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) . Do the all systems DTC check, and troubleshoot any powertrain DTCs first.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

How to Clear DTCs

1. With the ignition switch in LOCK (0) or vehicle in OFF mode, connect the HDS to the data link connector (DLC) under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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), or press the engine start/stop button to select the OFF mode.

DTC Troubleshooting Index

'09 model

DTC TROUBLESHOOTING CHART

'10-11 model

DTC TROUBLESHOOTING CHART

Symptom Troubleshooting Index

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

SYMPTOM TROUBLESHOOTING CHART

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CONNECTOR TERMINAL DESCRIPTION

System Outline

This system is composed of the VSA modulator-control unit, the wheel speed sensors, the steering angle sensor, the yaw rate-lateral acceleration sensor *1 , the yaw rate-lateral/longitudinal acceleration sensor *2 , and the system indicators in the gauge control module. The VSA modulator-control unit controls the ABS, EBD, TCS, VSA, HSA *2 , and brake assist with the brake pressure of each wheel and reduces engine torque.

*1: Without SH-AWD

*2: With SH-AWD

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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.

Grip force of tire and road surface

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Main Control

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

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

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

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EBD (Electronic Brake Distribution) Features

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

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TCS (Traction Control System) Features

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

Without SH-AWD

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With SH-AWD

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Oversteer control

Applies the brakes to the front and rear outside wheels

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

Brake Assist Features

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

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

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

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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, and the pump motor.

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.

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MODULATOR UNIT MODE REFERENCE

HSA (Hill Start Assist) Features (With SH-AWD)

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

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1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS. Is DTC 11,13,15, and/or 17 indicated? YES -Go to step 5. 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 47P connector. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__intermittent-failures) .
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the VSA modulator-control unit 47P connector (see step 5 on ).
7. Start the engine.
8. Measure the voltage between body ground and the appropriate wheel speed sensor +B and GND terminals of the VSA modulator-control unit 47P connector individually (see table). CONNECTOR TERMINAL REFERENCE CHART DTC Appropriate Terminal + B GND 11 (Right-front) FR +B: No. 34 FR-GND: No. 33 13 (Left-front) FL +B: No. 45 FL-GND: No. 46 15 (Right-rear) RR +B: No. 43 RR-GND: No. 42 17 (Left-rear) RL +B: No. 36 RL-GND: No. 37 Is there 0.1 V or more? YES -Repair a short to power in the wire between the VSA modulator-control unit and the appropriate wheel speed sensor. NO -Go to step 9.
9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Check for continuity between body ground and the appropriate wheel speed sensor +B and GND terminals of the VSA modulator-control unit 47P connector individually (see table). CONNECTOR TERMINAL REFERENCE CHART DTC Appropriate Terminal + B GND 11 (Right-front) FR +B: No. 34 FR-GND: No. 33 13 (Left-front) FL +B: No. 45 FL-GND: No. 46 15 (Right-rear) RR +B: No. 43 RR-GND: No. 42 17 (Left-rear) RL +B: No. 36 RL-GND: No. 37 Is there continuity? YES -Go to step 11. NO -Go to step 13 .
11. Disconnect the appropriate wheel speed sensor 2P connector (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
12. Check for continuity between body ground and the appropriate wheel speed sensor +B and GND terminals of the VSA modulator-control unit 47P connector individually (see table). CONNECTOR TERMINAL REFERENCE CHART DTC Appropriate Terminal +B GND 11 (Right-front) FR +B: No. 34 FR-GND: No. 33 13 (Left-front) FL +B: No. 45 FL-GND: No. 46 15 (Right-rear) RR +B: No. 43 RR-GND: No. 42 17 (Left-rear) RL +B: No. 36 RL-GND: No. 37 Is there continuity? YES -Repair a short to body ground in the wire between the VSA modulator-control unit and the wheel speed sensor. NO -Replace the wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
13. Disconnect the appropriate wheel speed sensor 2P connector (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
14. Check for continuity between the appropriate wheel speed sensor +B and GND terminals of the VSA modulator-control unit 47P connector (see table). CONNECTOR TERMINAL REFERENCE CHART DTC Appropriate Terminal +B GND 11 (Right-front) FR +B: No. 34 FR-GND: No. 33 13 (Left-front) FL +B: No. 45 FL-GND: No. 46 15 (Right-rear) RR + B: No. 43 RR-GND: No. 42 17 (Left-rear) RL +B: No. 36 RL-GND: No. 37 Is there continuity? YES -Repair a short in the wires between the VSA modulator-control unit and the wheel speed sensor. NO -Go to step 15.
15. Connect the wheel speed sensor 2P connector terminals No. 1 and No. 2 to body ground with a jumper wire. CONNECTOR TERMINAL REFERENCE CHART DTC Appropriate Wheel Speed Sensor 11 Right-front 13 Left-front 15 Right-rear 17 Left-rear
16. Check for continuity between body ground and the appropriate wheel speed sensor +B and GND terminals of the VSA modulator-control unit 47P connector individually (see table). CONNECTOR TERMINAL REFERENCE CHART DTC Appropriate Terminal +B GND 11 (Right-front) FR +B: No. 34 FR-GND: No. 33 13 (Left-front) FL +B: No. 45 FL-GND: No. 46 15 (Right-rear) RR +B: No. 43 RR-GND: No. 42 17 (Left-rear) RL +B: No. 36 RL-GND: No. 37 Is there continuity? YES -Go to step 17. NO -Repair an open in the wire between the VSA modulator-control unit and the wheel speed sensor.
17. Substitute the appropriate wheel speed sensor with the opposite side wheel speed sensor, or with a known-good wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
18. Reconnect all connectors.
19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
20. Clear the DTC with the HDS.
21. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
22. Check for DTCs with the HDS. Is the same DTC indicated that is indicated in step 4 ? YES -Go to step 23. NO -Replace the original wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
23. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
24. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
25. Check for DTCs with the HDS. Is DTC 11,13, 15, and/or 17 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

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

Note. If the ABS and the VSA indicators came on because of electrical noise, the indicator will go off when you test-drive the vehicle at 9 mph (15 km/h) after the system returns to normal.

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1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Check that the appropriate wheel speed sensor is properly mounted (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ). CONNECTOR TERMINAL REFERENCE CHART DTC Appropriate Wheel Speed Sensor 12 Right-front 14 Left-front 16 Right-rear 18 Left-rear Is the wheel speed sensor installation OK? YES -Go to step 3. NO -Reinstall the wheel speed sensor, and check the mounting position (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ). Then go to step 3.
3. Inspect the appropriate magnetic encoder for damage, debris, and correct installation. MAGNETIC ENCODER REFERENCE CHART DTC Appropriate Magnetic Encoder Note 12 Right-front Remove the driveshaft outboard joint from the appropriate wheel hub (see «FRONT DRIVESHAFT REMOVAL»(/acura/tl/iv-2008-2011/remont/axle-shafts/#drivelineaxle__front-driveshaft-removal) ). 14 Left-front 16 Right-rear Remove the hub bearing unit (see «KNUCKLE/HUB BEARING UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/suspension-rear/#rear-suspension) ). 18 Left-rear Is the magnetic encoder OK? YES -Go to step 4. NO -Remove the debris from the magnetic encoder, or replace the wheel bearing (front) or the hub bearing unit (rear): Front: Replace the wheel bearing (see «WHEEL BEARING REPLACEMENT»(/acura/tl/iv-2008-2011/remont/suspension-front/#front-suspension) ). Rear: Replace the hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/suspension-rear/#rear-suspension) ).
4. Disconnect the VSA modulator-control unit 47P connector (see step 5 on ).
5. Check for continuity between the appropriate wheel speed sensor GND terminal and other wheel speed sensor GND terminals of the VSA modulator-control unit 47P connector (see table). CONNECTOR TERMINAL REFERENCE CHART DTC Appropriate Terminal Other Terminals 12 FR-GND: No. 33 No. 46 No. 42 No. 37 14 FL-GND: No. 46 No. 33 No. 42 No. 37 16 RR-GND: No. 42 No. 33 No. 46 No. 37 18 RL-GND: No. 37 No. 33 No. 46 No. 42 Is there continuity? YES -Repair a short in the wires between the appropriate wheel speed sensor and the other wheel speed sensor. NO -Go to step 6.
6. Substitute a known-good wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
7. Reconnect all connectors.
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Clear the DTC with the HDS.
10. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
11. Check for DTCs with the HDS. Is DTC 12, 14, 16, or 18 indicated? YES -Go to step 12. NO -Replace the original wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
12. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
13. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
14. 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 the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

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

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS. Is DTC 21, 22, 23, or 24 indicated? YES -Go to step 5. NO -The system is OK at this time.
5. Inspect the appropriate magnetic encoder for damage, debris, and correct installation. CONNECTOR TERMINAL REFERENCE CHART DTC Appropriate Magnetic Encoder Note 21 Right-front Remove the driveshaft outboard joint from the appropriate wheel hub (see «WHEEL BEARING REPLACEMENT»(/acura/tl/iv-2008-2011/remont/suspension-front/#front-suspension) ). 22 Left-front 23 Right-rear Remove the hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/suspension-rear/#rear-suspension) ). 24 Left-rear Is the magnetic encoder OK? YES -Go to step 6. NO -Remove the debris from the magnetic encoder, or replace the wheel bearing (front) or the hub bearing unit (rear): Front: Replace the wheel bearing (see «WHEEL BEARING REPLACEMENT»(/acura/tl/iv-2008-2011/remont/suspension-front/#front-suspension) ). Rear: Replace the hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/suspension-rear/#rear-suspension) ).
6. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
7. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
8. Check for DTCs with the HDS. Is DTC 21, 22, 23, or 24 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

Scheme 34

Scheme 35

Scheme 36

Scheme 37

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
4. Check for DTCs with the HDS. Is DTC 25, 26, 28, or 104 indicated? YES -Go to step 8 . NO -Go to step 5.
5. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
6. Check for DTCs with the HDS. Is DTC 25, 26, 28, or 104 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for loose terminals between the yaw rate-lateral acceleration sensor 4P connector or the yaw rate-lateral/longitudinal acceleration sensor 4P connector, and the VSA modulator-control unit 47P connector. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__intermittent-failures) .
7. Check the size, air pressure, and the amount of wear of all four tires, and check the wheel alignment (see «WHEEL ALIGNMENT»(/acura/tl/iv-2008-2011/remont/wheel-alignment/#front-suspension-and-rear-suspension-inspection__wheel-alignment) ). Is the tire condition and wheel alignment OK? YES -Go to step 8. NO -Make sure the suspension is not modified, and adjust the wheel alignment, and recheck by test-driving.
8. Check the YAW/G SENSOR DIAGNOSIS in the VSA FREEZE DATA with the HDS. Is the YAW/G SENSOR DIAGNOSIS OK? YES -Go to step 9. NO -Replace the yaw rate-lateral acceleration sensor (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ), or the yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Disconnect the yaw rate-lateral acceleration sensor 4P connector (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ), or the yaw rate-lateral/longitudinal acceleration 4P connector (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
11. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
12. Measure the voltage between yaw rate-lateral acceleration sensor 4P connector or yaw rate-lateral/longitudinal acceleration sensor 4P connector terminals No. 1 and No. 4. Is there battery voltage? YES -Go to step 17 . NO -Go to step 13.
13. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
14. Disconnect the driver's under-dash fuse/relay box connector P (20P) (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-dash-fuserelay-box) ).
15. Check for continuity between yaw rate-lateral acceleration sensor 4P connector or yaw rate-lateral/longitudinal acceleration sensor 4P connector terminal No. 1 and driver's under-dash fuse/relay box connector P (20P) terminal No. 7. Is there continuity? YES -Go to step 16. NO -Repair an open in the wire between the yaw rate-lateral acceleration sensor or the yaw rate-lateral/longitudinal acceleration sensor, and the driver's under-dash fuse/relay box.
16. Check for continuity between yaw rate-lateral acceleration sensor 4P connector or yaw rate-lateral/longitudinal acceleration sensor 4P connector terminal No. 4 and body ground. *1: With SH-AWD Is there continuity? YES -Go to step 17. NO -Repair an open in the wire between the yaw rate-lateral acceleration sensor or the yaw rate-lateral/longitudinal acceleration sensor, and body ground (G403).
17. Disconnect the VSA modulator-control unit 47P connector (see step 5 ).
18. Check for continuity between VSA modulator-control unit 47P connector terminals No. 12, No. 13, and yaw rate-lateral acceleration sensor 4P connector or yaw rate-lateral/longitudinal acceleration sensor 4P connector terminals No. 3, No. 2 individually. *1: With SH-AWD Is there continuity? YES -Go to step 19. NO -Repair an open in the wire between the VSA modulator-control unit and the yaw rate-lateral acceleration sensor or the yaw rate-lateral/longitudinal acceleration sensor.
19. Substitute a known-good yaw rate-lateral acceleration sensor (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ), or the yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
20. Reconnect all connectors.
21. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
22. Clear the DTC with the HDS.
23. Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-sensor-neutral-position-memorization) ).
24. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
25. Check for DTCs with the HDS. Is DTC 25, 26, 28, or 104 indicated? YES -Go to step 26. NO -Replace the original yaw rate-lateral acceleration sensor (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ), or the yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
26. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
27. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
28. Check for DTCs with the HDS. Is DTC 25, 26, 28, or 104 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

1. Check the size, air pressure, and the amount of wear of all four tires, and check the wheel alignment (see «WHEEL ALIGNMENT»(/acura/tl/iv-2008-2011/remont/wheel-alignment/#front-suspension-and-rear-suspension-inspection__wheel-alignment) ). Is the tire condition and wheel alignment OK? YES -Go to step 2. NO -Make sure the suspension is not modified, and adjust the wheel alignment, and recheck by test-driving.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Clear the DTC with the HDS.
4. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
5. Check for DTCs with the HDS. Is DTC 27 indicated? YES -Go to step 6. 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 47P connector. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__intermittent-failures) .
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Disconnect the steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ).
8. Disconnect the VSA modulator-control unit 47P connector (see step 5 ).
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
10. Measure the voltage between body ground and VSA modulator-control unit 47P connector terminals No. 5 and No. 40 individually. Is there 0.1 V or more? YES -Repair a short to power in the wire between the VSA modulator-control unit and the steering angle sensor. NO -Go to step 11.
11. Measure the voltage between body ground and VSA modulator-control unit 47P connector terminals No. 30, No. 38, and No. 41 individually. Is there 0.1 V or more? YES -Repair a short to power in the wire between the VSA modulator-control unit and the steering angle sensor. NO -Go to step 12.
12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
13. Check for continuity between body ground and VSA modulator-control unit 47P connector terminals No. 5 and No. 40 individually. Is there continuity? YES -Repair a 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 body ground and VSA modulator-control unit 47P connector terminals No. 30, No. 38, and No. 41 individually. Is there continuity? YES -Repair a short to body ground in the wire between the VSA modulator-control unit and the steering angle sensor. NO -Go to step 15.
15. Check for continuity between VSA modulator-control unit 47P connector terminals No. 5, No. 40 and steering angle sensor 5P connector terminals No. 5, No. 1 individually. Is there continuity? YES -Go to step 16. NO -Repair an open in the wire between the VSA modulator-control unit and the steering angle sensor.
16. Check for continuity between VSA modulator-control unit 47P connector terminals No. 30, No. 38, No. 41 and steering angle sensor 5P connector terminals No. 3, No. 4, and No. 2 individually. Is there continuity? YES -Go to step 17. NO -Repair an open in the wire between the VSA modulator-control unit and the steering angle sensor.
17. Substitute a known-good steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ).
18. Reconnect all connectors.
19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
20. Clear the DTC with the HDS.
21. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
22. Check for DTCs with the HDS. Is DTC 27 indicated? YES -Go to step 23. NO -Replace the original steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ).
23. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
24. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
25. Check for DTCs with the HDS. Is DTC 27 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

Scheme 44

Scheme 45

Scheme 46

1. Check the size, air pressure, and the amount of wear of all four tires, and check the wheel alignment (see «WHEEL ALIGNMENT»(/acura/tl/iv-2008-2011/remont/wheel-alignment/#front-suspension-and-rear-suspension-inspection__wheel-alignment) ). Is the tire condition and wheel alignment OK? YES -Go to step 2. NO -Make sure the suspension is not modified, and adjust the wheel alignment, and recheck by test-driving.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Slowly drive the vehicle straight ahead without turning the steering wheel for 10 ft (3 m) or more, then park the vehicle while holding the steering wheel in the straight ahead position.
4. Check the STEERING ANGLE in the VSA DATA LIST with the HDS. Is it 0° ± 3°? YES -Go to step 6 . NO -Go to step 5.
5. Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-sensor-neutral-position-memorization) ).
6. Clear the DTC with the HDS.
7. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
8. Check for DTCs with the HDS. Is DTC 27 indicated? YES -Go to step 9. NO -The system is OK at this time.
9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Disconnect the steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ).
11. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
12. Measure the voltage between the steering angle sensor 5P connector terminal No. 5 and body ground. Is there battery voltage? YES -Go to step 13. NO -Repair an open in the wire between the No. 6 (7.5 A) fuse in the driver's under-dash fuse/relay box and the steering angle sensor.
13. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
14. Check for continuity between the steering angle sensor 5P connector terminal No. 1 and body ground. Is there continuity? YES -Go to step 15. NO -Repair an open in the wire between the steering angle sensor and body ground (G401).
15. Disconnect the VSA modulator-control unit 47P connector (see step 5 ).
16. Check for continuity between VSA modulator-control unit 47P connector terminals No. 12, No 13 and steering angle sensor 5P connector terminals No. 4, No. 2 individually. Is there continuity? YES -Go to step 17. NO -Repair an open in the wire between the VSA modulator-control unit and the steering angle sensor.
17. Substitute a known-good steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ).
18. Reconnect all connectors.
19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
20. Clear the DTC with the HDS.
21. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
22. Check for DTCs with the HDS. Is DTC 27 indicated? YES -Go to step 23. NO -Replace the original steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ).
23. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
24. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
25. Check for DTCs with the HDS. Is DTC 27 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

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

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
4. Check for DTCs with the HDS. Is DTC 31, 32, 33, 34, 35, 36, 37, or 38 indicated? YES -Go to step 5. NO -The system is OK at this time.
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
6. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
7. Check for DTCs with the HDS. Is DTC 31, 32, 33, 34, 35, 36, 37, or 38 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

Scheme 47

Scheme 48

Scheme 49

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS. Is DTC 51 or 52 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for loose terminals in the VSA modulator-control unit 47P connector. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__intermittent-failures) .
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Check the No. 2-2 (40 A) fuse in the under-hood fuse/relay box. Is the fuse blown? YES -Go to step 7. NO -Reinstall the checked fuse, then go to step 14 .
7. Disconnect the VSA modulator-control unit 47P connector (see step 5 ).
8. Check for continuity between VSA modulator-control unit 47P connector terminal No. 1 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the No. 2-2 (40 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit. NO -Install a new No. 2-2 (40 A) fuse in the under-hood fuse/relay box, then go to step 9.
9. Reconnect the VSA modulator-control unit 47P connector.
10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
11. Clear the DTC with the HDS.
12. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
13. Check for DTCs with the HDS. Is DTC 51 or 52 indicated? YES -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -Troubleshooting is complete.
14. Disconnect the VSA modulator-control unit 47P connector (see step 5 ).
15. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 16. NO -Repair an open in the wire between the No. 2-2 (40 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit.
16. Check for continuity between VSA modulator-control unit 47P connector terminal No. 47 and body ground. Is there continuity? YES -Go to step 17. NO -Repair an open in the wire between the VSA modulator-control unit and body ground (G202).
17. Reconnect the VSA modulator-control unit 47P connector.
18. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
19. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
20. Check for DTCs with the HDS. Is DTC 51 or 52 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

Scheme 50

Scheme 51

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS. Is DTC 54 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Check the No. 2-3 (30 A) fuse in the under-hood fuse/relay box. Is the fuse blown? YES -Go to step 7. NO -Reinstall the checked fuse, then go to step 14 .
7. Disconnect the VSA modulator-control unit 47P connector (see step 5 ).
8. Check for continuity between VSA modulator-control unit 47P connector terminal No. 32 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the No. 2-3 (30 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit. NO -Install a new No. 2-3 (30 A) fuse in the under-hood fuse/relay box, then go to step 9.
9. Reconnect the VSA modulator-control unit 47P connector.
10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
11. Clear the DTC with the HDS.
12. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
13. Check for DTCs with the HDS. Is DTC 54 indicated? YES -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -Troubleshooting is complete.
14. Disconnect the VSA modulator-control unit 47P connector (see step 5 on ).
15. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 32 and body ground. Is there battery voltage? YES -Go to step 16. NO -Repair an open in the wire between the No. 2-3 (30 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit.
16. Reconnect the VSA modulator-control unit 47P connector.
17. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
18. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
19. Check for DTCs with the HDS. Is DTC 54 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

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

Note. If the vehicle has high electric load or a weak battery, DTC 61 may be stored when starting the engine.

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode. Does the ABS indicator stay on? YES -Go to step 4. NO -The system is OK at this time.
4. Check for DTCs with the HDS. Is DTC 61 or 62 indicated? YES -Check the battery (see «BATTERY TEST»(/acura/tl/iv-2008-2011/remont/body-electrical/#battery) ) and the charging system (see «ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/charging-system/#charging-system__alternator-and-regulator-circuit-troubleshooting) ). NO -Do the appropriate troubleshooting for the DTC indicated.

Scheme 52

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS. Is DTC 64 indicated? YES -Go to step 5. NO -The system is OK at this time.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ).
7. Disconnect the VSA modulator-control unit 47P connector (see step 5 ).
8. Check for continuity between VSA modulator-control unit 47P connector terminal No. 5 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the VSA modulator-control unit and the steering angle sensor. NO -Go to step 9.
9. Reconnect all connectors.
10. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
11. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
12. Check for DTCs with the HDS. Is DTC 64 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

DTC 64: Sensor Power Voltage (With SH-AWD)

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS. Is DTC 64 indicated? YES -Go to step 5. NO -The system is OK at this time.
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
6. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
7. Check for DTCs with the HDS. Is DTC 64 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

Scheme 53

1. Check the brake fluid level in the master cylinder reservoir. Is the brake fluid level OK? YES -Go to step 2. NO -Inspect the brake pads: Front (see «FRONT BRAKE PAD INSPECTION AND REPLACEMENT»(/acura/tl/iv-2008-2011/remont/mechanical-hydraulic/#conventional-brake-components__front-brake-pad-inspection-and-replacement) ), rear (see «REAR BRAKE PAD INSPECTION AND REPLACEMENT»(/acura/tl/iv-2008-2011/remont/mechanical-hydraulic/#conventional-brake-components__rear-brake-pad-inspection-and-replacement) ), and replace worn out brake pads, then recheck.
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Clear the DTC with the HDS.
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
5. Disconnect the brake fluid level switch 2P connector (see step 6 in «MASTER CYLINDER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/mechanical-hydraulic/#conventional-brake-components__master-cylinder-replacement) ).
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
7. Check for DTCs with the HDS. Is DTC 65 indicated? YES -Go to step 8. NO -Replace the reservoir (brake fluid level switch is included) on the master cylinder (see «MASTER CYLINDER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/mechanical-hydraulic/#conventional-brake-components__master-cylinder-replacement) ).
8. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
9. Disconnect the gauge control module 32P connector (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
10. Check for continuity between brake fluid level switch 2P connector terminal No. 2 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the gauge control module and the brake fluid level switch. NO -Go to step 11.
11. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
12. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
13. Check for DTCs with the HDS. Is DTC 65 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

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

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS. Is DTC 66 indicated? YES -Go to step 5. NO -The system is OK at this time.
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
6. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
7. Check for DTCs with the HDS. Is DTC 66 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

DTC 68: Brake Pedal Position Switch

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check for other system DTCs. Are there other DTCs indicated? YES -Do the appropriate troubleshooting for the DTC. NO -Go to step 3.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Check the brake pedal position switch (see «BRAKE PEDAL POSITION SWITCH TEST»(/acura/tl/iv-2008-2011/remont/exterior-lights/#exterior-lights) ), and adjustment (see «EBD (ELECTRONIC BRAKE DISTRIBUTION) FEATURES»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__ebd-electronic-brake-distribution-features) . Is the brake pedal position switch and adjustment OK? YES -Go to step 5. NO -Adjust the brake pedal position switch. If necessary, replace the brake pedal position switch (see «EBD (ELECTRONIC BRAKE DISTRIBUTION) FEATURES»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__ebd-electronic-brake-distribution-features) .
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Clear the DTC with the HDS.
7. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
8. Check for DTCs with the HDS. Is DTC 68 indicated? YES -Go to step 9. NO -The system is OK at this time.
9. Troubleshoot the brake pedal position switch signal circuit (see «BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system) ). Is the brake pedal position switch circuit OK? YES -Go to step 10. NO -Repair the brake pedal position switch circuit (see «BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system) ).
10. Reconnect all connectors.
11. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
12. Clear the DTC with the HDS.
13. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
14. Check for DTCs with the HDS. Is DTC 68 indicated? YES -Check for loose terminals in the ECM/PCM connector A (49P). If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then retest. If the ECM/PCM was substituted, go to step 15. NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ).
15. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
16. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
17. Check for DTCs with the HDS. Is DTC 68 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

DTC 81: VSA Modulator-Control Unit Internal Circuit Malfunction

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check for other system DTCs. Are there other DTCs indicated? YES -Do the appropriate troubleshooting for the DTC. NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
5. Check for DTCs with the HDS. Is DTC 81 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
7. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
8. Check for DTCs with the HDS. Is DTC 81 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

DTC 83: PGM-FI Malfunction

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check for DTCs with the HDS. Is DTC 86 indicated? YES -Do the troubleshooting for DTC 86 (see «DTC 86: F-CAN COMMUNICATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__dtc-86-f-can-communication) ). NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
5. Check for DTCs with the HDS. Is DTC 83 indicated? YES -Go to step 6. NO -The system is OK at this time.
6. Check for fuel and emissions systems DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iv-2008-2011/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 -Go to step 7.
7. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
8. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
9. Check for DTCs with the HDS. Is DTC 83 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

DTC 84-01: VSA Sensor Neutral Position Not Written

1. Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-sensor-neutral-position-memorization) ).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
4. Check for DTCs with the HDS. Is DTC 84-01 indicated? YES -Go to step 5. NO -The system is OK at this time.
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
6. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
7. Check for DTCs with the HDS. Is DTC 84-01 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

DTC 84-12: Steering Angle Sensor Neutral Position

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check for DTCs with the HDS. Are any DTCs indicated with DTC 84-12 at the same time? YES -Troubleshoot any other DTCs first. NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Test-drive the vehicle at 25 mph (40 km/h) or more in the straight ahead driving position, then turn the steering wheel left and right at 30 degrees or more once for each side. Continue test-drive afterwards more than 120 seconds. NOTE: Drive the vehicle on the road, not on a lift.
5. Check for DTCs with the HDS. Is DTC 84-12 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time.
6. Check the size, air pressure, and the amount of wear of all four tires, and check the wheel alignment (see «WHEEL ALIGNMENT»(/acura/tl/iv-2008-2011/remont/wheel-alignment/#front-suspension-and-rear-suspension-inspection__wheel-alignment) ). Is the tire condition and wheel alignment OK? YES -Go to step 7. NO -Make sure the suspension is not modified, and adjust the wheel alignment (see «WHEEL ALIGNMENT»(/acura/tl/iv-2008-2011/remont/wheel-alignment/#front-suspension-and-rear-suspension-inspection__wheel-alignment) ), and recheck by test-driving.
7. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
8. Test-drive the vehicle at 25 mph (40 km/h) or more in the straight ahead driving position, then turn the steering wheel left and right at 30 degrees or more each for once. Continue test-drive afterwards more than 120 seconds. NOTE: Drive the vehicle on the road, not on a lift.
9. Check for DTCs with the HDS. Is DTC 84-12 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

DTC 86: F-CAN Communication

Note. Troubleshoot fuel and emissions DTCs first.

Scheme 54

Scheme 55

Scheme 56

Scheme 57

Scheme 58

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start and run the engine for at least 5 seconds.
4. Check for DTCs with the HDS. Is DTC 86 indicated? YES -Go to step 5. NO -Check the COMMU FI ECU, COMMU A/T (AT), COMMU GAUGE, COMMU YAW RATE/G, COMMU STEERING ANGLE S (With SH-AWD), and COMMU 4WD (With SH-AWD) in the VSA FREEZE DATA with the HDS. Then check for F-CAN communication lines continuity to the appropriate system or sensor and loose terminals in the appropriate system or sensor connectors.
5. Check the COMMU Fl ECU, COMMU ATT (A/T), COMMU GAUGE, COMMU YAW RATE/G, COMMU STEERING ANGLES (With SH-AWD), and COMMU 4WD (With SH-AWD) in the VSA DATA LIST with the HDS. Is there a communication error in the system or sensor? YES -Go to step 6. NO -Go to step 15 .
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Short the SCS line with the HDS.
8. Disconnect ECM/PCM connector A (49P) (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ).
9. Disconnect the VSA modulator-control unit 47P connector (see step 5 ).
10. Disconnect the gauge control module 32P connector (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
11. Disconnect the yaw rate-lateral acceleration sensor 4P connector (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ), or the yaw rate-lateral/longitudinal acceleration sensor 4P connector (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
12. With SH-AWD: Disconnect the steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ).
13. With SH-AWD: Disconnect SH-AWD control unit connector A (20P) (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
14. Check the F-CAN communication lines for continuity between the VSA modulator-control unit and the appropriate system or sensor (see table). COMPONENT REFERENCE CHART Component CAN-L Terminal CAN-H Terminal VSA modulator-control unit No. 13 No. 12 ECM/PCM No. A49 No. A48 Gauge Control Module No. 9 No. 10 Yaw Rate-lateral Acceleration Sensor or Yaw Rate-lateral/longitudinal Acceleration Sensor No. 2 No. 3 Steering Angle Sensor (With SH-AWD) No. 2 No. 4 SH-AWD Control Unit (With SH-AWD) No. A20 No.A10 *1: With SH-AWD: With SH-AWD: With SH-AWD: Do the F-CAN communication lines have continuity? YES -Go to step 15. NO -Repair an open in the appropriate wire.
15. Check for loose terminals in the appropriate system or sensor connectors. Are the appropriate system or sensor connectors OK? YES -Go to step 16. NO -Repair or reconnect the connector securely.
16. Check for other system or sensor DTCs with the HDS. Are there other DTCs indicated? YES -Do the appropriate DTC troubleshooting. NO -Go to step 17.
17. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
18. Start and run the engine for at least 5 seconds.
19. Check for DTCs with the HDS. Is DTC 86 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

DTC 91: VSA Activation Time Too Long

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS. Is DTC 91 indicated? YES -Go to step 5. NO -The system is OK at this time.
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
6. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
7. Check for DTCs with the HDS. Is DTC 91 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

DTC 105: Hydraulic Unit Temperature Sensor

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS. Is DTC 105 indicated? YES -Go to step 5. NO -The system is OK at this time.
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
6. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
7. Check for DTCs with the HDS. Is DTC 105 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

Scheme 59

Scheme 60

Scheme 61

Scheme 62

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
4. Check the REVERSE SWITCH STATUS in the VSA DATA LIST with the HDS. Does it indicate ON when the shift lever is in reverse, and OFF when the shift lever is in neutral? YES -Intermittent failure, the system is OK at this time. Check for loose terminals between the back-up light switch 2P connector and the VSA modulator-control unit 47P connector. Refer to «INTERMITTENT FAILURES TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__intermittent-failures) . NO -Go to step 5.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Check the back-up light switch (see «BACK-UP LIGHT SWITCH TEST/REPLACEMENT»(/acura/tl/iv-2008-2011/remont/manual-trans/#manual-transmission__back-up-light-switch-testreplacement) ). Is the back-up light switch OK? YES -Go to step 7. NO -Replace the back-up light switch (see «BACK-UP LIGHT SWITCH TEST/REPLACEMENT»(/acura/tl/iv-2008-2011/remont/manual-trans/#manual-transmission__back-up-light-switch-testreplacement) ).
7. Check the No. 12 (7.5 A) fuse in the driver's under-dash fuse/relay box. Is the fuse blown? YES -Go to step 8. NO -Reinstall the checked fuse, then go to step 18 .
8. Disconnect the driver's under-dash fuse/relay box connector F (33P) (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-dash-fuserelay-box) ).
9. Disconnect the back-up light switch 2P connector (see «BACK-UP LIGHT SWITCH TEST/REPLACEMENT»(/acura/tl/iv-2008-2011/remont/manual-trans/#manual-transmission__back-up-light-switch-testreplacement) ).
10. Check for continuity between back-up light switch 2P connector terminal No. 2 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the No. 12 (7.5 A) fuse in the driver's under-dash fuse/relay box and the back-up light switch. NO -Go to step 11.
11. Disconnect the VSA modulator-control unit 47P connector (see step 5 on ).
12. Check for continuity between VSA modulator-control unit 47P connector terminal No. 4 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the VSA modulator-control unit and the back-up light switch. NO -Install a new No. 12 (7.5 A) fuse in the driver's under-dash fuse/relay box, then go to step 13.
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
15. Clear the DTC with the HDS.
16. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
17. Check for DTCs with the HDS. Is DTC 111 indicated? YES -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -Troubleshooting is complete.
18. Disconnect the VSA modulator-control unit 47P connector (see step 5 ).
19. shift the shift lever into reverse.
20. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
21. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 4 and body ground. Is there battery voltage? YES -Go to step 22. NO -Repair an open in the wire between the No. 12 (7.5 A) fuse in the driver's under-dash fuse/relay box and the VSA modulator-control unit.
22. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
23. Disconnect the back-up light switch 2P connector (see «BACK-UP LIGHT SWITCH TEST/REPLACEMENT»(/acura/tl/iv-2008-2011/remont/manual-trans/#manual-transmission__back-up-light-switch-testreplacement) ).
24. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
25. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 4 and body ground. Is there 0.1 V or more? YES -Repair a short to power in the wire between the VSA modulator-control unit and the back-up light switch. NO -Go to step 26.
26. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
27. Reconnect all connectors.
28. shift the shift lever into neutral.
29. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
30. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
31. Check for DTCs with the HDS. Is DTC 111 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

Scheme 63

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start and run the engine for at least 5 seconds.
4. Check for DTCs with the HDS. Is DTC 86 indicated? YES -Do the troubleshooting for DTC 86 (see «DTC 86: F-CAN COMMUNICATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__dtc-86-f-can-communication) ). NO -Go to step 5.
5. Check for fuel and emissions systems DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ). Is DTC P0835 indicated? YES -Do the troubleshooting for DTC P0835 (see «DTC P0835: CLUTCH PEDAL POSITION SWITCH B CIRCUIT LOW VOLTAGE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dtc-p0835-clutch-pedal-position-switch) ). NO -Go to step 6.
6. Check the CRUISE CANSEL CLUTCH SWITCH STATUS in the VSA DATA LIST with the HDS while moving the clutch pedal. Does it indicate OFF when the pedal is pressed, and ON when the pedal is released? YES -Intermittent failure, the system is OK at this time. NO -Go to step 7.
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Check the clutch pedal position switch B (see «CRUISE CONTROL COMBINATION SWITCH TEST/REPLACEMENT»(/acura/tl/iv-2008-2011/remont/cruise-control-systems/#cruise-control-systems__cruise-control-combination-switch-testreplacement) ). Is the clutch pedal position switch B OK? YES -Go to step 9. NO -Replace the clutch pedal position switch B (see «CLUTCH PEDAL POSITION SWITCH B REPLACEMENT»(/acura/tl/iv-2008-2011/remont/cruise-control-systems/#cruise-control-systems) ).
9. Short the SCS line with the HDS.
10. Disconnect ECM connector A (49P) (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ).
11. Disconnect he clutch pedal position switch B 3P connector (see step 1 on «CLUTCH PEDAL POSITION SWITCH B REPLACEMENT»(/acura/tl/iv-2008-2011/remont/cruise-control-systems/#cruise-control-systems) ).
12. Check for continuity between clutch pedal position switch B 3P connector terminal No. 2 and ECM connector A (49P) terminal No. 47. Is there continuity? YES -Go to step 13. NO -Repair an open in the wire between the ECM and the clutch pedal position switch B.
13. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
14. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
15. Check for DTCs with the HDS. Is DTC 118 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

DTC 121, 122, 123, 124: VSA Solenoid

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS. Is DTC 121, 122, 123, or 124 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
6. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
7. Check for DTCs with the HDS. Is DTC 121, 122, 123, or 124 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 . NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the «INDICATED DTCS TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) .

DTC 158: ECU Software Update Failure

1. Update the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ).
2. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
3. Check for DTCs with the HDS. Is DTC 158 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If necessary, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), and retest. NO -The system is OK at this time.

VSA activation indicator does not go off, and no DTCs are stored ('09 model)

Note. If the VSA modulator-control unit was replaced prior to the activation indicator turning on, do the VSA sensor neutral position memorization (see VSA SENSOR NEUTRAL POSITION MEMORIZATION ).

Scheme 64

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check the VSA activation indicator for several seconds when the ignition switch is turned to ON (II), or press the engine start/stop button to select the ON mode. Does the indicator come on then go off? YES -The system is OK at this time. NO -Go to step 3.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the VSA OFF switch 5P connector (see «VSA OFF SWITCH TEST»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
5. Check the VSA OFF switch (see «VSA OFF SWITCH TEST»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ). Is the VSA OFF switch OK? YES -Go to step 6. NO -Replace the VSA OFF switch (see «VSA OFF SWITCH TEST»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
6. Disconnect the gauge control module 32P connector (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
7. Check for continuity between VSA OFF switch 5P connector terminal No. 1 and body ground. Is there continuity? YES -Repair a short to body ground between the gauge control module and the VSA OFF switch. NO -Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ), then go to step 1 and recheck. If it is OK, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).

Scheme 65

Scheme 66

Scheme 67

Scheme 68

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Check the No. 6 (7.5 A) fuse in the driver's under-dash fuse/relay box. Is the fuse blown? YES -Go to step 3. NO -Reinstall the checked fuse, then go to step 12 .
3. Disconnect the VSA modulator-control unit 47P connector (see step 5 ).
4. Disconnect the yaw rate-lateral acceleration sensor 4P connector (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ), or the yaw rate-lateral/longitudinal acceleration sensor 4P connector (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
5. With SH-AWD: Disconnect the steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ). NOTE: Without SH-AWD, the steering angle sensor is not powered by IG1.
6. Check for continuity between VSA modulator-control unit 47P connector terminal No. 8 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the No. 6 (7.5 A) fuse in the driver's under-dash fuse/relay box and the VSA modulator-control unit, the yaw rate-lateral acceleration sensor (Without SH-AWD), or the yaw rate-lateral/longitudinal acceleration sensor, and the steering angle sensor (With SH-AWD). NO -Install a new No. 6 (7.5 A) fuse in the driver's under-dash fuse/relay box, then go to step 7.
7. Reconnect the VSA modulator-control unit 47P connector.
8. Reconnect the yaw rate-lateral acceleration sensor 4P connector or the yaw rate-lateral/longitudinal acceleration sensor 4P connector.
9. With SH-AWD: Reconnect the steering angle sensor 5P connector.
10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
11. Check the ABS indicator, the brake system indicator, and the VSA indicator for several seconds when the ignition switch is turned to ON (II), or press the engine start/stop button to select the ON mode. Do the indicators come on then go off? YES -Troubleshooting is complete. NO -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
12. Do the gauge control module troubleshooting (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ). Is the gauge control module OK? YES -Go to step 13. NO -Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ). If it is OK, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
13. Disconnect the VSA modulator-control unit 47P connector (see step 5 ).
14. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
15. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 8 and body ground. Is there battery voltage? YES -Go to step 16. NO -Repair an open in the wire between the No. 6 (7.5 A) fuse in the driver's under-dash fuse/relay box and the VSA modulator-control unit.
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
17. Check for continuity between VSA modulator-control unit 47P connector terminal No. 16 and body ground. Is there continuity? YES -Go to step 18. NO -Repair an open in the wire between the VSA modulator-control unit and body ground (G202).
18. Disconnect the gauge control module 32P connector (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
19. Check for continuity between the VSA modulator-control unit 47P connector terminal and gauge control module 32P connector terminal (see table). CONNECTOR TERMINAL REFERENCE CHART Sign VSA Modulator-control Unit 47P Connector Terminal Gauge Control Module 32P Connector Terminal CAN-L No. 13 No. 9 CAN-H No. 12 No. 10 Is there continuity? YES -Go to step 20. NO -Repair an open in the wire between the gauge control module and the VSA modulator-control unit.
20. Reconnect all connectors.
21. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
22. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.
23. Check the ABS indicator, the brake system indicator, and the VSA indicator for several seconds when the ignition switch is turned to ON (II), or press the engine start/stop button to select the ON mode. Do the indicators come on then go off? YES -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 .

VSA OFF switch does not work (VSA cannot be turned OFF) ('10-11 Model)

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

Scheme 69

1. Turn the ignition switch to LOCK(0), or press the engine start/stop button to select the OFF mode.
2. Check the VSA OFF switch (see «VSA OFF SWITCH TEST»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ). Is the VSA OFF switch OK? YES -Go to step 3. NO -Replace the VSA OFF switch (see «VSA OFF SWITCH TEST»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
3. Disconnect the VSA OFF switch 5P connector (see «VSA OFF SWITCH TEST»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
4. Disconnect the gauge control module 32P connector (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
5. Check for continuity between VSA OFF switch 5P connector terminal No. 1 and body ground. Is there continuity? YES -Repair a short to body ground between the gauge control module and the VSA OFF switch. NO -Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ), then go to step 1 and recheck. If it is OK, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).

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 70

Scheme 71

Scheme 72

Scheme 73

1. With the wheels in the straight ahead position and the steering wheel centered, then remove the steering wheel (see «STEERING WHEEL REMOVAL»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-wheel-removal) ).
2. Remove the steering column covers (see «STEERING COLUMN COVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard__steering-column-cover-removalinstallation) ).
3. Disconnect the combination light switch 12P connector (A) and the steering angle sensor 5P connector (B) from the combination switch assembly/cable reel (C).
4. Disconnect the dashboard wire harness 4P connector (A) from the cable reel 4P connector (B), then disconnect the dashboard wire harness 20P connector (C) and the wiper/washer switch 8P connector (D).
5. Remove the combination switch assembly/cable reel mounting screws (A).
6. Remove the wire harness clips (B), then remove the combination switch assembly/cable reel from the steering column.
7. Remove the cable reel (see step 8 under «CABLE REEL REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system) ).
8. Remove the combination light switch (A) and the wiper/washer switch (B) from the combination switch body assembly (C).
9. Install the combination switch body assembly in the reverse order of removal, and note these items: Do not remove the steering angle sensor from the combination switch body assembly. When installing the cable reel, set the turn signal canceling sleeve position so that the arrow points straight up (see «CABLE REEL REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system) ). Tighten the combination switch mounting screw in the proper sequence (see «STEERING WHEEL INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-wheel-installation) ). With SH-AWD: Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-sensor-neutral-position-memorization) ).

Without SH-AWD

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

Scheme 74

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Remove the center console (see «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#consoles__center-console-removalinstallation) ).
3. Disconnect the yaw rate-lateral acceleration sensor 4P connector (A), then remove the yaw rate-lateral acceleration sensor (B).
4. Check for deformation in the bracket (C). If necessary replace it.
5. Install the yaw rate-lateral acceleration sensor in the reverse order of removal.
6. Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-sensor-neutral-position-memorization) ).

With SH-AWD

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

Scheme 75

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Remove the center console (see «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#consoles__center-console-removalinstallation) ).
3. MT: Remove the shift lever assembly (see «SHIFT LEVER HOUSING REPLACEMENT»(/acura/tl/iv-2008-2011/remont/manual-trans/#manual-transmission__shift-lever-housing-replacement) ).
4. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 4P connector (A), then remove the yaw rate-lateral/longitudinal acceleration sensor (B).
5. Check for deformation in the bracket (C). If necessary replace it.
6. Install the yaw rate-lateral/longitudinal acceleration sensor in the reverse order of removal.
7. Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-sensor-neutral-position-memorization) ).
8. Do the yaw rate-lateral/longitudinal acceleration neutral position memorization (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION NEUTRAL POSITION MEMORIZATION»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential__yaw-rate-laterallongitudinal-acceleration-neutral-position-m) ).

VSA Sensor Neutral Position Memorization

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

Scheme 76

1. Park the vehicle on a flat and level surface, with the steering wheel in the straight ahead position.
2. With the ignition switch in LOCK (0), or press the engine start/stop button to select the OFF mode, connect the HDS to the data link connector (DLC) (A) under the driver's side of the dashboard.
3. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
4. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) .
5. Select VSA ADJUSTMENT with the HDS, and follow the screen prompts. NOTE: See the HDS Help menu for specific instructions.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

Scheme 77

Scheme 78

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard) ).
3. Push out the VSA OFF switch (A) from the back of the dashboard.
4. Disconnect the VSA OFF switch 5P connector (B).
5. On the switch side, check for continuity between the VSA OFF switch 5P connector terminals No. 1 and No. 2. There should be continuity when the button is pressed, and no continuity when the button is released.
6. Install the VSA OFF switch in the reverse order of removal.

'10-11 Model

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

Scheme 79

Scheme 80

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard) ).
3. Push out the VSA OFF switch (A) from the back of the dashboard.
4. Disconnect the VSA OFF switch 5P connector (B).
5. On the switch side, check for continuity between the VSA OFF switch 5P connector terminals No. 1 and No. 2. There should be no continuity when the button is pressed, and continuity when the button is released.
6. Install the VSA OFF switch in the reverse order of removal.

VSA Modulator-Control Unit Update

Special Tools Required

1. Honda Diagnostic System (HDS) tablet tester
2. Honda Interface Module (HIM) and an iN workstation with the latest HDS software version
3. HDS pocket tester
4. GNA600 and an iN workstation with the latest HDS software version

Any one of above updating tools can be used.

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

Scheme 81

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, but do not start the engine.
2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't, troubleshooting the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) .
4. Select the update mode, and follow the screen prompts to update the VSA modulator-control unit.
5. If the software in the VSA modulator-control unit is the latest, disconnect the HDS/HIM/GNA600 from the DLC. If the software in the VSA modulator-control unit is not the latest, follow the instructions on the screen.
6. Do the VSA sensor neutral position memorization procedure (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-sensor-neutral-position-memorization) ).

VSA Modulator-Control Unit Removal and Installation

Note. Do not spill brake fluid on the vehicle; it may damage the paint. If brake fluid gets on the paint, wash it off immediately with water. Be careful not to damage or deform the brake lines during removal and installation. After removal, plug the ends of the hoses and the joints to prevent spilling brake fluid.

Scheme 82

Scheme 83

Scheme 84

Scheme 85

Scheme 86

Scheme 87

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Remove the left and right engine compartment covers (A) (see «ENGINE COMPARTMENT COVER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#exterior-trim__engine-compartment-cover-replacement) ).
3. Remove the suction line mounting bolt (A) from the bracket.
4. Disconnect the 10 mm brake lines (A) and the 12 mm brake lines (B) from the VSA modulator-control unit (C).
5. Disconnect the VSA modulator-control unit 47P connector (A) by pushing the lock (B) and pulling up the lever (C); the connector disconnects itself.
6. Remove the VSA modulator-control unit bracket mounting bolts (A) and the wire harness clips (B), then remove the VSA modulator-control unit (C) with the bracket (D) from the body.
7. Remove the TORX bolts (A), then remove the VSA modulator-control unit (B) from the bracket (C).

Scheme 88

Scheme 89

Scheme 90

Scheme 91

Scheme 92

Scheme 93

1. Install the VSA modulator-control unit (A) onto the bracket (B), then tighten the TORX bolts (C).
2. Install the VSA modulator-control unit (A) with the bracket (B) to the body, then install the wire harness clips (C) and the VSA modulator-control unit bracket mounting bolts (D).
3. Align the connecting surface of the VSA modulator-control unit 47P connector (A) to the VSA modulator-control unit.
4. Pull down the lever (B) of the VSA modulator-control unit 47P connector, then confirm the connector is fully seated.
5. Connect the 10 mm brake lines and the 12 mm brake lines to the VSA modulator-control unit (A). NOTE: Brake lines are connected to the master cylinder (B), the left-front (C), the right-front (D), the left-rear (E), and the right-rear (F) brake systems.
6. Install the suction line mounting bolt (A) to the bracket.
7. Bleed the brake system (see «BRAKE SYSTEM BLEEDING»(/acura/tl/iv-2008-2011/remont/mechanical-hydraulic/#conventional-brake-components__brake-system-bleeding) ).
8. Install the left and right engine compartment covers (A) (see «ENGINE COMPARTMENT COVER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#exterior-trim__engine-compartment-cover-replacement) ).
9. Do the VSA modulator-control unit update (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ).
10. Do the VSA sensor neutral position memorization procedure (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-sensor-neutral-position-memorization) ).
11. Start the engine, and make sure the ABS and the VSA indicators go off.
12. Test-drive the vehicle, and make sure the ABS and the VSA indicators 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/tl/iv-2008-2011/remont/mechanical-hydraulic/#conventional-brake-components__brake-system-bleeding) ).

Scheme 94

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

Scheme 95

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

See also:
• BRAKE SYSTEM BLEEDING
• DLC CIRCUIT TROUBLESHOOTING
• SELF-DIAGNOSTIC FUNCTION
• GENERAL TROUBLESHOOTING INFORMATION
• FRONT DRIVESHAFT REMOVAL
• KNUCKLE/HUB BEARING UNIT REPLACEMENT
• WHEEL BEARING REPLACEMENT
• WHEEL ALIGNMENT
• DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION
• BATTERY TEST
• ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING
• FRONT BRAKE PAD INSPECTION AND REPLACEMENT
• REAR BRAKE PAD INSPECTION AND REPLACEMENT
• MASTER CYLINDER REPLACEMENT
• GAUGE CONTROL MODULE REPLACEMENT
• BRAKE PEDAL POSITION SWITCH TEST
• BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING
• ECM/PCM UPDATE
• SUBSTITUTING THE ECM/PCM
• ECM/PCM REPLACEMENT
• SH-AWD CONTROL UNIT REPLACEMENT
• BACK-UP LIGHT SWITCH TEST/REPLACEMENT
• DTC P0835: CLUTCH PEDAL POSITION SWITCH B CIRCUIT LOW VOLTAGE
• CRUISE CONTROL COMBINATION SWITCH TEST/REPLACEMENT
• CLUTCH PEDAL POSITION SWITCH B REPLACEMENT
• STEERING WHEEL REMOVAL
• STEERING COLUMN COVER REMOVAL/INSTALLATION
• CABLE REEL REPLACEMENT
• STEERING WHEEL INSTALLATION
• CENTER CONSOLE REMOVAL/INSTALLATION
• SHIFT LEVER HOUSING REPLACEMENT
• YAW RATE-LATERAL/LONGITUDINAL ACCELERATION NEUTRAL POSITION MEMORIZATION
• DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION
• ENGINE COMPARTMENT COVER REPLACEMENT
• INDICATED DTCS TROUBLESHOOTING
• 12
• 21
• 31
• 61
• 64
• 66
• 68
• 81
• 83
• 84-01
• 86
• 91
• 105
• 121
• 158
• 84-12
• VSA MODULATOR-CONTROL UNIT UPDATE
• VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION
• VSA ACTIVATION INDICATOR DOES NOT GO OFF, AND NO DTCS ARE STORED ('09 MODEL)
• VSA OFF SWITCH DOES NOT WORK (VSA CANNOT BE TURNED OFF) ('10 MODEL)
• INTERMITTENT FAILURES TROUBLESHOOTING
• VSA SENSOR NEUTRAL POSITION MEMORIZATION
• STEERING ANGLE SENSOR REPLACEMENT
• EBD (ELECTRONIC BRAKE DISTRIBUTION) FEATURES