Vsa System Components (4-cyl) Acura TSX II

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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 OFF indicator (D)

When the system is OK, each indicator comes on for about 2 seconds after turning the ignition switch to ON (II), then goes off.

When the system detects a problem, a DTC will set and depending upon the failure, the VSA modulator-control unit determines which indicator(s) will turn on. If the problem goes away (system returns to normal), the indicator(s) will be controlled in the following way depending upon the DTC that was set

1. The indicator(s) will come on and stay on when the ignition switch is ON (II).
2. The indicator(s) will automatically go off.
3. The indicator(s) will go off after the vehicle is driven.

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 will come on.

VSA Indicator

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

VSA OFF Indicator

The VSA OFF indicator comes on, when the VSA is turned OFF by using the VSA OFF switch.

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 the 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) and until the ABS and VSA indicators go off. Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned to LOCK (0).
2. When the system detects a problem, the VSA modulator-control unit shifts to 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 during the first acceleration after the vehicle starts driving.

Brake Fluid Replacement/Air Bleeding

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

How to Troubleshoot DTCs

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

Note. Always troubleshoot fuel and emissions 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 and/or VSA indicators do not come on during the test-drive, but troubleshooting is done based on the DTC, check for loose connectors, poor contact of the terminals, etc. in the circuit indicated by the DTC.
3. After troubleshooting, or the repairs are done, clear the DTCs, and test-drive the vehicle under the same conditions that originally set the DTCs. Make sure the ABS and VSA indicators do not come on.

Intermittent Failures

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

How to Use the HDS (Honda Diagnostic System)

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

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1. If the system indicators stay on, connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__dlc-circuit-troubleshooting) ).
4. Check the diagnostic trouble code (DTC) and the freeze data, and note them. Then refer to the indicated DTC's troubleshooting, 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 can read the DTC, the freeze data, the current data, and other system data. For specific operations, refer to the Help menu that came with the HDS.

How to Retrieve DTCs

1. With the ignition switch in LOCK (0), connect the HDS to the data link connector (DLC) under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) .
5. Turn the ignition switch to LOCK (0).

How to Clear DTCs

1. With the ignition switch in LOCK (0), connect the HDS to the data link connector (DLC) under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__dlc-circuit-troubleshooting) ).
4. Clear the DTC(s) by following the screen prompts on the HDS.
5. Turn the ignition switch to LOCK (0).

DTC Troubleshooting Index

DTC TROUBLESHOOTING 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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TERMINAL DESCRIPTION CHART

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TERMINAL DESCRIPTION CHART

System Outline

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

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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.

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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.

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Oversteer Control

Applies the brake to the front and rear outside wheels

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1. Applies the brake 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 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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SOLENOID VALVE REFERENCE CHART

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

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

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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
5. Check for DTCs with the HDS. Is DTC 11, 13, 15, or 17 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
6. Turn the ignition switch to LOCK (0).
7. Disconnect the VSA modulator-control unit 47P connector (see step 4 on ).
8. 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). TERMINAL CONTINUITY 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 VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there continuity? YES -Go to step 9. NO -Go to step 11 .
9. Disconnect the appropriate wheel speed sensor 2P connector (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ).
10. On the sensor side, check for continuity between body ground and wheel speed sensor 2P connector terminals No. 1 and No. 2 individually. WHEEL SPEED SENSOR 2P CONNECTOR Is there continuity? YES -Replace the appropriate wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ). NO -Repair a short to body ground in the wire between the VSA modulator-control unit and the appropriate wheel speed sensor.
11. Turn the ignition switch to ON (II).
12. 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). TERMINAL VOLTAGE 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 VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there 0.1 V or more? YES -Go to step 13. NO - Go to step 17 .
13. Turn the ignition switch to LOCK (0).
14. Disconnect the appropriate wheel speed sensor 2P connector (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ).
15. Turn the ignition switch to ON (II).
16. On the sensor side, measure the voltage between body ground and wheel speed sensor 2P connector terminals No. 1 and No. 2 individually. WHEEL SPEED SENSOR 2P CONNECTOR Is there 0.1 V or more? YES -Replace the appropriate wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ). NO -Repair a short to power in the wire between the VSA modulator-control unit and the appropriate wheel speed sensor.
17. Turn the ignition switch to LOCK (0).
18. Disconnect the appropriate wheel speed sensor 2P connector (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ).
19. Check for continuity between the appropriate VSA modulator-control unit 47P connector wheel speed sensor +B and GND terminals (see table). TERMINAL CONTINUITY 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 VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there continuity? YES -Repair a short in the wires between the appropriate wheel speed sensor and the VSA modulator-control unit. NO -Go to step 20.
20. Check for continuity between the appropriate VSA modulator-control unit 47P connector terminal and the wheel speed sensor 2P connector terminal (see table). TERMINAL CONTINUITY REFERENCE CHART DTC VSA Modulator-Control Unit 47P Connector Terminal Appropriate Wheel Speed Sensor 2P Connector Terminal No. 2 11 No. 34 Right-front 13 No. 45 Left-front 15 No. 43 Right-rear 17 No. 36 Left-rear Is there continuity? YES -Go to step 21. NO -Repair an open in the wire between the appropriate wheel speed sensor and the VSA modulator-control unit.
21. Check for continuity between the appropriate VSA modulator-control unit 47P connector terminal and the wheel speed sensor 2P connector terminal (see table). TERMINAL CONTINUITY REFERENCE CHART DTC VSA Modulator-Control Unit 47P Connector Terminal Appropriate Wheel Speed Sensor 2P Connector Terminal No. 1 11 No. 33 Right-front 13 No. 46 Left-front 15 No. 42 Right-rear 17 No. 37 Left-rear Is there continuity? YES - If the DTCs indicate one wheel speed sensor (either the right or left) on the same axle (front or rear), go to step 22. If the DTCs indicate both wheel speed sensors (right or left) on the same axle (front or rear), go to step 29 . NO -Repair an open in the wire between the appropriate wheel speed sensor and the VSA modulator-control unit.
22. Swap the applicable left and right wheel speed sensors.
23. Reconnect all connectors.
24. Turn the ignition switch to ON (II).
25. Clear the DTC with the HDS.
26. Turn the ignition switch to LOCK (0).
27. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
28. Check for DTCs with the HDS. DTC CHART DTCs Before Swapping DTCs After Swapping 11 (Right-front) 13 (Left-front) 13 (Left-front) 11 (Right-front) 15 (Right-rear) 17 (Left-rear) 17 (Left-rear) 15 (Right-rear) Is the DTC indicated for the opposite wheel? YES -Replace the original wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ). NO -Go to step 29.
29. Substitute a known-good wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ).
30. Reconnect all connectors.
31. Turn the ignition switch to ON (II).
32. Clear the DTC with the HDS.
33. Turn the ignition switch to LOCK (0).
34. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
35. Check for DTCs with the HDS. Is DTC 11, 13, 15, or 17 indicated? YES -Go to step 36. NO -Replace the original wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ).
36. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
37. Turn the ignition switch to LOCK (0).
38. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
39. Check for DTCs with the HDS. Is DTC 11, 13, 15, or 17 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

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

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If the ABS and the VSA indicators come on because of electrical noise, the indicator goes 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).
2. Check that the appropriate wheel speed sensor is properly mounted (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ). DTC 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ).
3. Inspect the appropriate magnetic encoder for damage, debris, and correct installation. DTC CHART DTC Appropriate Magnetic Encoder Note 12 Right-front Remove the driveshaft outboard joint from the appropriate wheel hub (see «KNUCKLE/HUB REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/suspension-front/#front-suspension-4-cyl) ). 14 Left-front 16 Right-rear Remove the hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/suspension-rear/#rear-suspension-4-cyl) ). 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 front wheel bearing (see «KNUCKLE/HUB REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/suspension-front/#front-suspension-4-cyl) ). Rear: Replace the rear hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/suspension-rear/#rear-suspension-4-cyl) ).
4. Disconnect the VSA modulator-control unit 47P connector (see step 4 on ).
5. Check for continuity between the appropriate wheel speed sensor GND terminal and the other wheel speed sensor GND terminals of the VSA modulator-control unit 47P connector (see table). TERMINAL CONTINUITY 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ).
7. Reconnect all connectors.
8. Turn the ignition switch to ON (II).
9. Clear the DTC with the HDS.
10. Turn the ignition switch to LOCK (0).
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 12, 14, 16, or 18 indicated? YES -Go to step 13. NO -Replace the original wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ).
13. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
14. Turn the ignition switch to LOCK (0).
15. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
16. Check for DTCs with the HDS. Is DTC 12, 14, 16, or 18 indicated? YES -Check for loose terminals in the VSA modulator-control unit 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

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

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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 21, 22, 23, or 24 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
6. Inspect the appropriate magnetic encoder for damage, debris, and correct installation. DTC CHART DTC Appropriate Magnetic Encoder Note 21 Right-front Remove the driveshaft outboard joint from the appropriate wheel hub (see «KNUCKLE/HUB REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/suspension-front/#front-suspension-4-cyl) ). 22 Left-front 23 Right-rear Remove the hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/suspension-rear/#rear-suspension-4-cyl) ). 24 Left-rear Is the magnetic encoder OK? YES -Go to step 7. NO -Remove the debris from the magnetic encoder, or replace the wheel bearing (front) or the hub bearing unit (rear): Front: Replace the front wheel bearing (see «KNUCKLE/HUB REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/suspension-front/#front-suspension-4-cyl) ). Rear: Replace the rear hub bearing unit (see «HUB BEARING UNIT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/suspension-rear/#rear-suspension-4-cyl) ).
7. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
8. Turn the ignition switch to LOCK (0).
9. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
10. 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 25: Yaw Rate Sensor Malfunction; DTC 26: Lateral Acceleration Sensor Malfunction; DTC 104: Yaw Rate-Acceleration Sensor Malfunction

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

Scheme 95

Scheme 96

Scheme 97

Scheme 98

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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 25, 26, or 104 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
6. Check the size, air pressure, and the amount of wear of all four tires (see «WHEEL ALIGNMENT»(/acura/tsx/ii-2008-2014/remont/wheel-alignment/#front-and-rear-suspension-inspection-4-cyl__wheel-alignment) ). Is the tire condition OK? YES -Go to step 7. NO -Replace the tires and/or adjust the air pressure, then recheck by test-driving.
7. Check the YAW/G COMBINE SENSOR DIAGNOSIS in the VSA FREEZE DATA with the HDS. Is YAW/G COMBINE SENSOR DIAGNOSIS NORMAL? YES -Go to step 13 . NO -Go to step 8.
8. Turn the ignition switch to LOCK (0).
9. Disconnect the yaw rate-acceleration sensor 4P connector (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__yaw-rate-acceleration-sensor-replacement) ).
10. Turn the ignition switch to ON (II).
11. Measure the voltage between yaw rate-acceleration sensor 4P connector terminals No. 1 and No. 4. YAW RATE-ACCELERATION SENSOR 4P CONNECTOR Is there battery voltage? YES -Replace the yaw rate-acceleration sensor (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__yaw-rate-acceleration-sensor-replacement) ). NO -Go to step 12.
12. Measure the voltage between yaw rate-acceleration sensor 4P connector terminal No. 1 and body ground. YAW RATE-ACCELERATION SENSOR 4P CONNECTOR Is there battery voltage? YES -Repair an open in the wire between the yaw rate-acceleration sensor and body ground (G503). NO -Repair an open in the wire between the yaw rate-acceleration sensor and the driver's under-dash fuse/relay box.
13. Turn the ignition switch to LOCK (0).
14. Disconnect the yaw rate-acceleration sensor 4P connector (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__yaw-rate-acceleration-sensor-replacement) ).
15. Turn the ignition switch to ON (II).
16. Measure the voltage between yaw rate-acceleration sensor 4P connector terminals No. 1 and No. 4. YAW RATE-ACCELERATION SENSOR 4P CONNECTOR Is there battery voltage? YES -Go to step 18 . NO -Go to step 17.
17. Measure the voltage between yaw rate-acceleration sensor 4P connector terminal No. 1 and body ground. YAW RATE-ACCELERATION SENSOR 4P CONNECTOR Is there battery voltage? YES -Repair an open in the wire between the yaw rate-acceleration sensor and body ground (G503). NO -Repair an open in the wire between the yaw rate-acceleration sensor and the driver's under-dash fuse/relay box.
18. Check the wheel alignment (see «WHEEL ALIGNMENT»(/acura/tsx/ii-2008-2014/remont/wheel-alignment/#front-and-rear-suspension-inspection-4-cyl__wheel-alignment) ). Is the wheel alignment OK? YES -Go to step 19. NO -Make sure the suspension is not modified, and correct the wheel alignment, and recheck by test-driving.
19. Substitute a known-good yaw rate-acceleration sensor (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__yaw-rate-acceleration-sensor-replacement) ).
20. Reconnect all connectors.
21. Turn the ignition switch to ON (II).
22. Clear the DTC with the HDS.
23. Turn the ignition switch to LOCK (0).
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, or 104 indicated? YES -Go to step 26. NO -Replace the original yaw rate-acceleration sensor (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__yaw-rate-acceleration-sensor-replacement) ).
26. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
27. Turn the ignition switch to LOCK (0).
28. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
29. Check for DTCs with the HDS. Is DTC 25, 26, 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 27: Steering Angle Sensor Malfunction

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

Scheme 99

Scheme 100

Scheme 101

Scheme 102

Scheme 103

Scheme 104

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
6. Check the size, air pressure, and the amount of wear of all four tires (see «WHEEL ALIGNMENT»(/acura/tsx/ii-2008-2014/remont/wheel-alignment/#front-and-rear-suspension-inspection-4-cyl__wheel-alignment) ). Is the tire condition OK? YES -Go to step 7. NO -Replace the tires and/or adjust the air pressure, then recheck by test-driving.
7. Turn the ignition switch to LOCK (0).
8. Disconnect the steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__steering-angle-sensor-replacement) ).
9. Disconnect the VSA modulator-control unit 47P connector (see step 4 on ).
10. Turn the ignition switch to ON (II).
11. Measure the voltage between body ground and VSA modulator-control unit 47P connector terminals No. 5 and No. 40 individually. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR 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. Measure the voltage between body ground and VSA modulator-control unit 47P connector terminals No. 30, No. 38, and No. 41 individually. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR 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 13.
13. Turn the ignition switch to LOCK (0).
14. Check for continuity between body ground and VSA modulator-control unit 47P connector terminals No. 5 and No. 40 individually. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR 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 body ground and VSA modulator-control unit 47P connector terminals No. 30, No. 38, and No. 41 individually. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR 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 16.
16. Check for continuity between VSA modulator-control unit 47P connector terminal and steering angle sensor 5P connector terminal individually (see table). TERMINAL CONTINUITY REFERENCE CHART Sign VSA Modulator-Control Unit 47P Connector Terminal Steering Angle Sensor 5P Connector Terminal SVCC No. 5 No. 5 SGND No. 40 No. 1 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. Check for continuity between VSA modulator-control unit 47P connector terminal and steering angle sensor 5P connector terminal individually (see table). TERMINAL CONTINUITY REFERENCE CHART Sign VSA Modulator-Control Unit 47P Connector Terminal Steering Angle Sensor 5P Connector Terminal STR-A No. 41 No. 2 STR-B No. 38 No. 4 STR-Z No. 30 No. 3 Is there continuity? YES -Go to step 18. NO -Repair an open in the wire between the VSA modulator-control unit and the steering angle sensor.
18. Check the wheel alignment (see «WHEEL ALIGNMENT»(/acura/tsx/ii-2008-2014/remont/wheel-alignment/#front-and-rear-suspension-inspection-4-cyl__wheel-alignment) ). Is the wheel alignment OK? YES -Go to step 19. NO -Make sure the suspension is not modified, and the steering rack is centered. Then correct the wheel alignment, and recheck by test-driving.
19. Substitute a known-good steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__steering-angle-sensor-replacement) ). NOTE: Make sure the steering angle sensor and combination switch are mounted properly.
20. Reconnect all connectors.
21. Turn the ignition switch to ON (II).
22. Clear the DTC with the HDS.
23. Turn the ignition switch to LOCK (0).
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 -Go to step 26. NO -Check for loose terminals in the steering angle sensor 5P connector. If the connections are OK, replace the steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__steering-angle-sensor-replacement) ).
26. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
27. Turn the ignition switch to LOCK (0).
28. Test-drive the vehicle around a number of corners. NOTE: Drive the vehicle on the road, not on a lift.
29. 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

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

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
4. Check for DTCs with the HDS. Is DTC 31, 32, 33, 34, 35, 36, 37, or 38 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
6. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 51: Motor Lock; DTC 52: Motor Stuck

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

Scheme 105

Scheme 106

Scheme 107

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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 51 or 52 Indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
6. Turn the ignition switch to LOCK (0).
7. Check the No. 2-5 (30 A) fuse in the under-hood fuse/relay box. Is the fuse blown? YES -Go to step 8. NO -Reinstall the checked fuse, then go to step 16 .
8. Disconnect the VSA modulator-control unit 47P connector (see step 4 on ).
9. Check for continuity between VSA modulator-control unit 47P connector terminal No. 1 and body ground. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there continuity? YES -Repair a short to body ground in the wire between the No. 2-5 (30 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit. NO -Install a new No. 2-5 (30 A) fuse in the under-hood fuse/relay box, then go to step 10.
10. Reconnect the VSA modulator-control unit 47P connector.
11. Turn the ignition switch to ON (II).
12. Clear the DTC with the HDS.
13. Turn the ignition switch to LOCK (0).
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 51 or 52 indicated? YES -Go to step 20 . NO -Troubleshooting is complete.
16. Disconnect the VSA modulator-control unit 47P connector (see step 4 on ).
17. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 1 and body ground. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there battery voltage? YES -Go to step 18. NO -Repair an open in the wire between the No. 2-5 (30 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit.
18. Check for continuity between VSA modulator-control unit 47P connector terminals No. 47 and body ground. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there continuity? YES -Go to step 19. NO -Repair an open in the wire between the VSA modulator-control unit and body ground (G202).
19. Reconnect the VSA modulator-control unit 47P connector.
20. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
21. Turn the ignition switch to LOCK (0).
22. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
23. 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 54: Fail-Safe Relay Malfunction

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

Scheme 108

Scheme 109

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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 54 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
6. Turn the ignition switch to LOCK (0).
7. Check the No. 2-3 (30 A) fuse in the under-hood fuse/relay box. Is the fuse blown? YES -Go to step 8. NO -Reinstall the checked fuse, then go to step 16 .
8. Disconnect the VSA modulator-control unit 47P connector (see step 4 on ).
9. Check for continuity between VSA modulator-control unit 47P connector terminal No. 32 and body ground. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR 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 10.
10. Reconnect the VSA modulator-control unit 47P connector.
11. Turn the ignition switch to ON (II).
12. Clear the DTC with the HDS.
13. Turn the ignition switch to LOCK (0).
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 54 indicated? YES -Go to step 19 . NO -Troubleshooting is complete.
16. Disconnect the VSA modulator-control unit 47P connector (see step 4 on ).
17. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 32 and body ground. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there battery voltage? YES -Go to step 18. 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.
18. Reconnect the VSA modulator-control unit 47P connector.
19. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
20. Turn the ignition switch to LOCK (0).
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 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

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

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). 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).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again. Does the ABS indicator come on? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
4. Check for DTCs with the HDS. Is DTC 61 or 62 indicated? YES -Check the battery (see «BATTERY TEST»(/acura/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl__battery-test) ), and troubleshoot the alternator regulator circuit (see «ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/charging-system/#charging-system-4-cyl__alternator-and-regulator-circuit-troubleshooting) ). NO -Do the appropriate troubleshooting for the DTC indicated.

DTC 64: Sensor Power Source Voltage Malfunction

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

Scheme 110

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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 64 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
6. Turn the ignition switch to LOCK (0).
7. Disconnect the steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__steering-angle-sensor-replacement) ).
8. Disconnect the VSA modulator-control unit 47P connector (see step 4 on ).
9. Check for continuity between VSA modulator-control unit 47P connector terminal No. 5 and body ground. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR 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 10.
10. Reconnect all connectors.
11. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
12. Turn the ignition switch to LOCK (0).
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 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 65: Brake Fluid Level Low

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

Scheme 111

1. Check the brake fluid level in the master cylinder reservoir (see «BRAKE SYSTEM BLEEDING»(/acura/tsx/ii-2008-2014/remont/mechanical-hydraulic/#conventional-brake-components-4-cyl__brake-system-bleeding) ). 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/tsx/ii-2008-2014/remont/mechanical-hydraulic/#conventional-brake-components-4-cyl__front-brake-pad-inspection-and-replacement) ), rear (see «REAR BRAKE PAD INSPECTION AND REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/mechanical-hydraulic/#conventional-brake-components-4-cyl__rear-brake-pad-inspection-and-replacement) ), and replace worn out brake pads, then recheck.
2. Turn the ignition switch to ON (II).
3. Clear the DTC with the HDS.
4. Turn the ignition switch to LOCK (0).
5. Disconnect the brake fluid level switch 2P connector (see step 3 on «MASTER CYLINDER REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/mechanical-hydraulic/#conventional-brake-components-4-cyl__master-cylinder-replacement) ).
6. Turn the ignition switch to ON (II).
7. Check for DTCs with the HDS. Is DTC 65 indicated? YES -Go to step 8. NO -Replace the master cylinder (see «MASTER CYLINDER REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/mechanical-hydraulic/#conventional-brake-components-4-cyl__master-cylinder-replacement) ).
8. Turn the ignition switch to LOCK (0).
9. Disconnect the gauge control module 32P connector (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ).
10. Check for continuity between brake fluid level switch 2P connector terminal No. 2 and body ground. BRAKE FLUID LEVEL SWITCH 2P CONNECTOR 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
12. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 66: Pressure Sensor Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Before you troubleshoot, check the brake pedal height, free play, and brake pedal position switch adjustment (see BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT ).

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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 66 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
6. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
7. Turn the ignition switch to LOCK (0).
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 66 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). • NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 68: Brake Pedal Position Switch Malfunction

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

1. Turn the ignition switch to ON (II).
2. Check for other system DTCs. Is another DTC indicated? YES -Do the appropriate troubleshooting for the DTC. NO -Go to step 3.
3. Turn the ignition switch to LOCK (0).
4. Check the brake pedal position switch (see «BRAKE PEDAL POSITION SWITCH TEST»(/acura/tsx/ii-2008-2014/remont/exterior-lights/#exterior-lights-4-cyl) ), and adjustment (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/tsx/ii-2008-2014/remont/mechanical-hydraulic/#conventional-brake-components-4-cyl) ). 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 «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/tsx/ii-2008-2014/remont/mechanical-hydraulic/#conventional-brake-components-4-cyl) ).
5. Turn the ignition switch to ON (II).
6. Clear the DTC with the HDS.
7. Turn the ignition switch to LOCK (0).
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 68 indicated? YES -Go to step 10. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
10. Troubleshoot the brake pedal position switch signal circuit (see «BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl) ). Is the brake pedal position switch circuit OK? YES -Go to step 11. NO -Repair the brake pedal position switch circuit.
11. Reconnect all connectors.
12. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
13. Turn the ignition switch to ON (II).
14. Clear the DTC with the HDS.
15. Turn the ignition switch to LOCK (0).
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 ECM/PCM connector A (49P). If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then retest. If the ECM/PCM was substituted, go to step 18. 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ).
18. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
19. Turn the ignition switch to LOCK (0).
20. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
21. 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, and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). • NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 81: Modulator-Control Unit Internal Circuit Malfunction

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

1. Turn the ignition switch to ON (II).
2. Check for other system DTCs. Is another DTC indicated? YES -Do the appropriate troubleshooting for the DTC. NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Turn the ignition switch to LOCK (0).
5. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
6. Check for DTCs with the HDS. Is DTC 81 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
7. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
8. Turn the ignition switch to LOCK (0).
9. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
10. 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, and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). • NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 83: PGM-FI Malfunction

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

1. Turn the ignition switch to ON (II).
2. Check for DTC with the HDS. Is DTC 86 indicated? YES -Do the troubleshooting for DTC 86 (see «DTC 86: F-CAN COMMUNICATION MALFUNCTION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__dtc-86-f-can-communication-malfunction) ). NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Turn the ignition switch to LOCK (0).
5. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
6. Check for DTCs with the HDS. Is DTC 83 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
7. Check for fuel and emissions systems DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl) ). Are any ECM/PCM DTCs indicated? YES -Do the applicable troubleshooting for the ECM/PCM. NO -Go to step 8.
8. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
9. Turn the ignition switch to LOCK (0).
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 83 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). • NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 84-01: VSA Sensor Neutral Position Not Written

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

1. Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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.
4. Check for DTCs with the HDS. Is DTC 84-01 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
5. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
6. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 84-12: Steering Angle Sensor Neutral Position Memorization Incomplete

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

1. Turn the ignition switch to ON (II).
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. Turn the ignition switch to LOCK (0).
5. 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.
6. Check for DTCs with the HDS. Is DTC 84-12 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/wheel-alignment/#front-and-rear-suspension-inspection-4-cyl__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 (see «WHEEL ALIGNMENT»(/acura/tsx/ii-2008-2014/remont/wheel-alignment/#front-and-rear-suspension-inspection-4-cyl__wheel-alignment) ), and recheck by test-driving.
8. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
9. 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 for more than 120 seconds. NOTE: Drive the vehicle on the road, not on a lift.
10. 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, and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). • NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 86: F-CAN Communication Malfunction

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

Scheme 112

Scheme 113

Scheme 114

Scheme 115

Scheme 116

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start and run the engine for at least 5 seconds.
5. Check for DTCs with the HDS. Is DTC 86 indicated? YES -Go to step 6. NO -Check the COMMU Fl ECU, COMMU A/T (A/T), COMMU GAUGE, and COMMU YAW RATE/G in the VSA FREEZE DATA with the HDS. Then check for F-CAN communication lines continuity to the appropriate system or sensor and loose terminals in the appropriate system or sensor connectors.
6. Check the COMMU Fl ECU, COMMU A/T (ATT), COMMU GAUGE, and COMMU YAW RATE/G in the VSA DATA LIST with the HDS. Is there a communication error in the system or sensor? YES -Go to step 7. NO -Go to step 22 .
7. Turn the ignition switch to LOCK (0).
8. Short the SCS line with the HDS.
9. Disconnect ECM/PCM connector A (49P) (see «ECM/PCM REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ).
10. Disconnect the VSA modulator-control unit 47P connector (see step 4 on ).
11. Disconnect the gauge control module 32P connector (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ).
12. Disconnect the yaw rate-acceleration sensor 4P connector (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__yaw-rate-acceleration-sensor-replacement) ).
13. Check the F-CAN communication lines for continuity between the VSA modulator-control unit and the appropriate system or sensor (see table). TERMINAL CONTINUITY REFERENCE CHART Component F-CAN L Terminal F-CAN H Terminal VSA Modulator-Control Unit 13 12 ECM/PCM A4 A3 Gauge Control Module 21 22 Yaw Rate-Acceleration Sensor 2 3 Is there continuity on the F-CAN communication lines? YES - If the appropriate system or sensor is the yaw rate-acceleration sensor: Go to step 14. If the appropriate system or sensor is not the yaw rate-acceleration sensor: Go to step 18 . NO -Repair an open in the appropriate wire.
14. Check for loose terminals in the yaw rate-acceleration sensor 4P connector. Is the yaw rate-acceleration sensor 4P connector OK? YES -Go to step 15. NO -Repair or reconnect the connector securely.
15. Turn the ignition switch to ON (II).
16. Measure the voltage between yaw rate-acceleration sensor 4P connector terminals No. 1 and No. 4. YAW RATE-ACCELERATION SENSOR 4P CONNECTOR Is there battery voltage? YES -Replace the yaw rate-acceleration sensor (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__yaw-rate-acceleration-sensor-replacement) ). NO -Go to step 17.
17. Measure the voltage between yaw rate-acceleration sensor 4P connector terminal No. 1 and body ground. YAW RATE-ACCELERATION SENSOR 4P CONNECTOR Is there battery voltage? YES -Repair an open in the wire between the yaw rate-acceleration sensor and body ground (G503). NO -Repair an open in the wire between the yaw rate-acceleration sensor and the driver's under-dash fuse/relay box.
18. Check for loose terminals in the appropriate system connectors. Are the appropriate system connectors OK? YES -Go to step 19. NO -Repair or reconnect the connector securely.
19. Reconnect all connectors.
20. Start and run the engine for at least 5 seconds.
21. Check for other system DTCs with the HDS. Is another DTC indicated? YES -Do the appropriate DTC troubleshooting. NO -Go to step 22.
22. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
23. Turn the ignition switch to LOCK (0).
24. Start and run the engine for at least 5 seconds.
25. 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, and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). • NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 91: VSA Activation Time Too Long

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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 Vindicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
6. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
7. Turn the ignition switch to LOCK (0).
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 91 indicated? YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). • NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 105: Hydraulic Unit Temperature Sensor Malfunction

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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 105 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
6. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
7. Turn the ignition switch to LOCK (0).
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 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

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

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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 121, 122, 123, or 124 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see «INTERMITTENT FAILURES»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__intermittent-failures) ).
6. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
7. Turn the ignition switch to LOCK (0).
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 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, and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). • NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC 158: ECU Software Update Failure

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

1. Update the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-update) ).
2. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
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 the VSA modulator-control unit was updated, and the symptom/indication is still present, replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). • NO -The system is OK at this time.

VSA cannot be turned OFF

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

Scheme 117

Scheme 118

Scheme 119

1. Turn the ignition switch to LOCK (0).
2. Check the VSA OFF switch (see «VSA OFF SWITCH TEST/REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ). Is the VSA OFF switch OK? YES -Go to step 3. NO -Replace the VSA OFF switch (see «VSA OFF SWITCH TEST/REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ).
3. Disconnect the VSA OFF switch 5P connector (see «VSA OFF SWITCH TEST/REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ).
4. Disconnect the gauge control module 32P connector (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ).
5. Check for continuity between gauge control module 32P connector terminals No. 29 and VSA OFF switch 5P connector terminal No. 2. Is there continuity? YES -Go to step 6. NO -Repair an open in the wire between the gauge control module and the VSA OFF switch.
6. Check for continuity between VSA OFF switch 5P connector terminal No. 2 and body ground. VSA OFF SWITCH 5P CONNECTOR Is there continuity? YES -Repair a short to body ground in the wire between the gauge control module and the VSA OFF switch. NO -Go to step 7.
7. Check for continuity between VSA OFF switch 5P connector terminal No. 1 and body ground. VSA OFF SWITCH 5P CONNECTOR Is there continuity? YES -Replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ). NO -Repair an open in the wire between the VSA OFF switch and body ground (G501).

Scheme 120

Scheme 121

Scheme 122

Scheme 123

1. Turn the ignition switch to LOCK (0).
2. Check the No. 6(7.5 A) fuse in the driver's under-dash fuse/relay box. Is the fuse blown? YES -Replace the fuse. Turn the ignition switch to ON (II), then turn it to LOCK (0) again. If the fuse blows again, repair the short to body ground on the No. 6 (7.5 A) fuse circuit. NO -Reinstall the checked fuse, then go to step 3.
3. Check the No. 2-3 (30 A) fuse in the under-hood fuse/relay box. Is the fuse blown? YES -Replace the fuse. If the fuse blows again, repair the short to body ground on the No. 2-3 (30 A) fuse circuit. NO -Reinstall the checked fuse, then go to step 4.
4. Do the gauge control module self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__self-diagnostic-function) ). Is the gauge control module OK? YES -Go to step 5. NO -Replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ).
5. Turn the ignition switch to LOCK (0).
6. Disconnect the VSA modulator-control unit 47P connector (see step 4 on ).
7. Turn the ignition switch to ON (II).
8. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 8 and body ground. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there battery voltage? YES -Go to step 9. 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.
9. Turn the ignition switch to LOCK (0).
10. Check for continuity between VSA modulator-control unit 47P connector terminal No. 16 and body ground. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there continuity? YES -Go to step 11. NO -Repair an open in the wire between the VSA modulator-control unit and body ground (G202).
11. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 32 and body ground. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there battery voltage? YES -Go to step 12. 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.
12. Disconnect the gauge control module 32P connector (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ).
13. Check for continuity between the VSA modulator-control unit 47P connector terminal and gauge control module 32P connector terminal (see table). TERMINAL CONTINUITY REFERENCE CHART Sign VSA Modulator-Control Unit 47P Connector Terminal Gauge Control Module 32P Connector Terminal F-CAN L No. 13 No. 21 F-CAN H No. 12 No. 22 Is there continuity? YES -Go to step 14. NO -Repair an open in the wire between the gauge control module and the VSA modulator-control unit.
14. Reconnect all connectors.
15. Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
16. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
17. Check the ABS indicator, the brake system indicator, and the VSA indicator for several seconds when the ignition switch is turned to ON (II). 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ), then retest. If the VSA modulator-control unit was substituted, go to step 1 .

Steering Angle Sensor Replacement

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

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

Scheme 124

1. Turn the ignition switch to LOCK (0).
2. With the front wheels in the straight-ahead position and the steering wheel centered, then remove the steering wheel (see «STEERING WHEEL REMOVAL»(/acura/tsx/ii-2008-2014/remont/manual-power-steering/#steering-4-cyl__steering-wheel-removal) ).
3. Remove the steering column covers (see «COLUMN COVER REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#dashboard-4-cyl__column-cover-removalinstallation) ) and the cable reel (see «CABLE REEL REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/airbag/#srs-supplemental-restraint-system-4-cyl) ).
4. Remove the combination switch assembly (see step 8 on «INSTALLATION»(/acura/tsx/ii-2008-2014/remont/manual-power-steering/#steering-4-cyl) ).
5. Remove the combination light switch (A) and the wiper/washer switch (B) from the combination switch body assembly (C).
6. Install the combination switch body assembly in the reverse order of removal, and note these items: NOTE: 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 «INSTALLATION»(/acura/tsx/ii-2008-2014/remont/airbag/#srs-supplemental-restraint-system-4-cyl) ). Tighten the combination switch assembly/cable reel mounting screws in the proper sequence (see step 1 on «INSTALLATION»(/acura/tsx/ii-2008-2014/remont/manual-power-steering/#steering-4-cyl) ).

Yaw Rate-Acceleration Sensor Replacement

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

Scheme 125

1. Turn the ignition switch to LOCK (0).
2. Remove the center console (see «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#consoles-4-cyl__center-console-removalinstallation) ).
3. M/T: Remove the shift lever assembly (see «SHIFT LEVER HOUSING REPLACEMENT»(ref-475400-S32969248762012052300000) ).
4. Remove the yaw rate-acceleration sensor (A).
5. Disconnect the yaw rate-acceleration sensor 4P connector (B).
6. Check for deformation in the bracket (C). If necessary replace it.
7. Install the yaw rate-acceleration sensor in the reverse order of removal.
8. Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-sensor-neutral-position-memorization) ).

VSA Sensor Neutral Position Memorization

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

Scheme 126

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), 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).
4. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__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).

Scheme 127

Scheme 128

Scheme 129

Scheme 130

1. Turn the ignition switch to LOCK (0).
2. Push out the VSA OFF switch (A) from the back of the instrument panel.
3. Disconnect the VSA OFF switch 5P connector (B).
4. On the switch side, check for continuity between the VSA OFF switch 5P connector terminal in each switch position according to the table. VSA OFF SWITCH 5P CONNECTOR If the switch does not work as described in the table, replace the switch. If the switch tests OK, go to step 5.
5. On the switch side, check for continuity between VSA OFF switch 5P connector terminals No. 4 and No. 5. There should be continuity at all times. VSA OFF SWITCH 5P CONNECTOR
6. If the continuity is not as specified, remove the cover (A), and replace the bulb (B).
7. 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
5. MVCI unit with the latest control module (CM) update software installed Any one of the above updating tools can be used.

Note. Use this procedure when you need to update the VSA modulator-control unit at any time. Make sure the HDS/iN workstation has the latest software version. Before you update the VSA modulator-control unit, make sure the battery in the vehicle is fully charged, and connect a jumper to the battery (not a battery charger) to maintain system voltage. Never turn the ignition switch to LOCK (0) or ACCESSORY (I) during the update. If there is a problem with the update, leave the ignition switch to ON (II). 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) 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 131

1. Turn the ignition switch to ON (II), but do not start the engine.
2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-sensor-neutral-position-memorization) ).

VSA Modulator-Control Unit Removal and Installation

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

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

Scheme 132

Scheme 133

1. Turn the ignition switch to LOCK (0).
2. Remove the suction line mount bolt (A) from the bracket.
3. Disconnect the receiver line (B) from the clamp (C).
4. Disconnect the VSA modulator-control unit 47P connector (A) by pushing the lock (B) and pulling down the lever (C); the connector disconnects itself.
5. Disconnect the six brake lines from the VSA modulator-control unit. NOTE: Brake lines are connected to the master cylinder (D) and to the left-front (E), the right-front (F), the left-rear (G), and the right-rear (H) brake systems.
6. Remove the 6 x 12 mm flange bolts (I) and 6x16 mm flange bolt (J), then remove the VSA modulator-control unit (K) with the bracket (L) from the body.
7. Remove the receiver line (M) from the bracket, then remove the clips (N).
8. Remove the VSA modulator-control unit from the bracket.

Installation

1. Install the VSA modulator-control unit onto the bracket.
2. Install the clips to the bracket, then install the receiver line.
3. Install the bracket with the VSA modulator-control unit to the body.
4. Reconnect the six brake lines, then tighten the flare nuts to the specified torque.
5. Align the connecting surface of the VSA modulator-control unit 47P connector to the VSA modulator-control unit.
6. Pull up the lever of the VSA modulator-control unit 47P connector, then confirm the connector is fully seated.
7. Install the suction line mount bolt to the bracket.
8. Bleed the brake system (see «BRAKE SYSTEM BLEEDING»(/acura/tsx/ii-2008-2014/remont/mechanical-hydraulic/#conventional-brake-components-4-cyl__brake-system-bleeding) ).
9. Do the VSA modulator-control unit update (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-update) ).
10. Do the VSA sensor neutral position memorization procedure (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-sensor-neutral-position-memorization) ).

Scheme 134

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

Scheme 135

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

See also:
• BRAKE SYSTEM BLEEDING
• DLC CIRCUIT TROUBLESHOOTING
• SELF-DIAGNOSTIC FUNCTION
• GENERAL TROUBLESHOOTING INFORMATION
• KNUCKLE/HUB REPLACEMENT
• HUB BEARING UNIT REPLACEMENT
• WHEEL ALIGNMENT
• BATTERY TEST
• ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING
• FRONT BRAKE PAD INSPECTION AND REPLACEMENT
• REAR BRAKE PAD INSPECTION AND REPLACEMENT
• MASTER CYLINDER REPLACEMENT
• GAUGE CONTROL MODULE REPLACEMENT
• BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT
• BRAKE PEDAL POSITION SWITCH TEST
• BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING
• ECM/PCM UPDATE
• SUBSTITUTING THE ECM/PCM
• ECM/PCM REPLACEMENT
• COMPONENT LOCATION INDEX
• STEERING WHEEL REMOVAL
• COLUMN COVER REMOVAL/INSTALLATION
• INSTALLATION
• CENTER CONSOLE REMOVAL/INSTALLATION
• DTC TROUBLESHOOTING
• 11
• 12
• 21
• 25
• 27
• 31
• 51
• 54
• 61
• 64
• 65
• 66
• 68
• 81
• 83
• 84-01
• 84-12
• 86
• 91
• 105
• 121
• 158
• VSA MODULATOR-CONTROL UNIT UPDATE
• VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION
• VSA SENSOR NEUTRAL POSITION MEMORIZATION
• INTERMITTENT FAILURES
• YAW RATE-ACCELERATION SENSOR REPLACEMENT
• STEERING ANGLE SENSOR REPLACEMENT