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Acura CSX. Manual - part 411

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DTC 66-15:

DTC 68-21:

YES

19-149

Pressure Sensor (Inside of VSA

Modulator-control Unit) Malfunction

Brake Pedal Position Switch Stuck

OFF

1. Test-drive the vehicle.

NOTE: Drive the vehicle on the road, not on a lift.

2. Turn the ignition switch to LOCK (0).

3. Raise the vehicle, and support it with safety stands

in the proper locations (see page 1-11).

4. Turn all four wheels by hand.

Repair the brake drag.

Go to step 5.

5. Turn the ignition switch to ON (II).

6. Check the BRAKE PRESS in the VSA DATA LIST

with the HDS while moving the brake pedal.

Intermittent failure, the system is OK at this

time.

Replace the VSA modulator-control unit

(see page 19-171).

1. Start the engine.

2. Check the BRAKE PRESS in the VSA DATA LIST

with the HDS. Do not press the brake pedal.

Go to step 3.

Check for brake drag or a misadjusted brake

pedal position switch. If they are normal, replace
the VSA modulator-control unit (see page 19-171).

3. Check the BRAKE SWITCH in the VSA DATA LIST

with the HDS while moving the brake pedal.

Intermittent failure, the system is OK at this

time. Check for loose terminals between the brake
pedal position switch 4P connector, ECM/PCM
connector A (44P), and the VSA modulator-control
unit 37P connector. Refer to intermittent failures
troubleshooting (see page 19-98).

Go to step 4.

4. Turn the ignition switch to LOCK (0).

5. Disconnect the brake pedal position switch 4P

connector.

Is ther e br ake dr ag?

Does the indicated value change?

Is ther e 10 MPa or less?

Does it indicate ON when the pedal is pr essed,
and OF F when the pedal is r eleased?

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−

YES

19-150

VSA System Components

BRAKE PEDAL POSITION SWITCH 4P CONNECTOR

(WHT)

BKSW
(LT GRN)

JUMPER WIRE

ECM/PCM CONNECTOR A (44P)

BRAKE PEDAL POSITION SWITCH 4P CONNECTOR

BKSW (LT GRN)

6. On the harness side, connect the brake pedal

position switch 4P connector terminals No. 1 and
No. 2 with a jumper wire.

7. Turn the ignition switch to ON (II).

8. Check the BRAKE SWITCH in the VSA DATA LIST

with the HDS.

Check the brake pedal position switch

adjustment (see page 19-6), If it is OK, replace the
brake pedal position switch.

Go to step 9.

9. Disconnect the jumper wire.

10. Turn the ignition switch to LOCK (0).

11. Short the SCS line with the HDS.

12. Disconnect ECM/PCM connector A (44P).

13. Check for continuity between brake pedal position

switch 4P connector terminal No. 2 and ECM/PCM
connector A (44P) terminal No. 40.

Update the ECM/PCM if it does not have the

latest software (see page 11-227), or substitute a
known-good ECM/PCM (see page 11-7), then go to
step 1, and recheck. If the ECM/PCM was updated
and DTCs are not indicated, troubleshooting is
complete. If the ECM/PCM was substituted and
DTCs are not indicated, replace the original ECM/
PCM (see page 11-228).

Repair open in the wire between the ECM/

PCM and the brake pedal position switch.

Wire side of female terminals

Terminal side of female terminals

Wire side of female terminals

Does it indicate ON?

Is ther e continuity?

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DTC 68-22:

YES

19-151

BRAKE PEDAL POSITION SWITCH 4P CONNECTOR

BKSW (LT GRN)

Brake Pedal Position Switch Stuck

1. Turn the ignition switch to ON (II).

2. Check the BRAKE PRESS in the VSA DATA LIST

with the HDS. Do not press the brake pedal.

Check the brake pedal height and the brake

pedal position switch adjustment (see page 19-6). If
the brake pedal height is OK, replace the VSA
modulator-control unit and the brake pedal position
switch adjustment (see page 19-171).

Go to step 3.

3. Check the BRAKE SWITCH in the VSA DATA LIST

with the HDS while moving the brake pedal.

Intermittent failure, the system is OK at this

time.

Go to step 4.

4. Check the BRAKE SWITCH in the VSA DATA LIST

with the HDS, and disconnect the brake pedal
position switch 4P connector.

Inspect the brake pedal switch and

adjustment (see page 19-6). If the switch and
adjustment are OK, replace the brake pedal
position switch (see page 19-6).

Go to step 5.

5. Turn the ignition switch to LOCK (0).

6. Short the SCS line with the HDS.

7. Disconnect ECM/PCM connector A (44P).

8. Turn the ignition switch to ON (II).

9. Measure the voltage between brake pedal position

switch 4P connector terminal No. 2 and body
ground.

Repair short to power in the wire between

the ECM/PCM and the brake pedal position
switch.

Update the ECM/PCM if it does not have the

Wire side of female terminals

Is it 10 MPa or mor e?

Does it indicate ON when the pedal is pr essed,
and OF F when the pedal is r eleased?

Does the indicator change f r om ON to OF F ?

Is ther e 0.1 V or mor e?

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DTC 71-21:

DTC 71-22:

DTC 71-23:

DTC 71-24:

DTC 71-25:

DTC 71-26:

DTC 71-27:

DTC 71-28:

DTC 71-29:

DTC 71-2A:

DTC 71-2B:

DTC 71-2C:

DTC

Sectional

YES

19-152

VSA System Components

Right-front or Left-rear Different

Diameter Tire Malfunction

Left-front or Right-rear Different

Diameter Tire Malfunction

Right-front and Right-rear

Different Diameter Tire Malfunction

Left-front and Left-rear Different

Diameter Tire Malfunction

Right-front and Left-front

Different Diameter Tire Malfunction

Right-rear and Left-rear Different

Diameter Tire Malfunction

Right-front or Left-rear Different

Diameter Tire Malfunction

Left-front or Right-rear Different

Diameter Tire Malfunction

Right-front and Right-rear

Different Diameter Tire Malfunction

Left-front and Left-rear Different

Diameter Tire Malfunction

Right-front and Left-front

Different Diameter Tire Malfunction

Right-rear and Left-rear Different

Diameter Tire Malfunction

NOTE: The DTC is indicated when the vehicle has a
different diameter tire(s) compared to the other tire(s).

71-21

Right-front or left-rear

71-22

Left-front or right-rear

71-23

Right-front and right-rear

71-24

Left-front and left-rear

71-25

Right-front and left-front

71-26

Right-rear and left-rear

71-27

Right-front or left-rear

71-28

Left-front or right-rear

71-29

Right-front and right-rear

71-2A

Left-front and left-rear

71-2B

Right-front and left-front

71-2C

Right-rear and left-rear

1. Check the tires for proper inflation and the correct

size (see page 18-5).

2. Turn the ignition switch to ON (II).

3. Clear the DTC with the HDS.

4. Test-drive the vehicle.

NOTE: Drive the vehicle on the road, not on a lift.

5. Check for DTCs with the HDS.

Replace tires as needed until all their

diameters match (see page 18-5).

Intermittent failure, the system is OK at this

time.

Is DT C 7 1-21, 7 1-22, 7 1-23, 7 1-24, 7 1-25, 7 1-26,
7 1-27 , 7 1-28, 7 1-29, 7 1-2A, 7 1-2B, or 7 1-2C
indicated?

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