Acura TSX / Honda Accord CL. Manual - part 287

4. Disconnect the HDS from the 16P DLC.  

5. Turn the ignition switch OFF, then turn it ON (II) again.  

6. Test-drive the vehicle. 

Does the ABS indicator come on, and is DTC 68 indicated? 

YES: Go to step 7.  

NO: The system is OK at this time.  

7. Troubleshoot the brake pedal position switch circuit (see CRUISE CONTROL INPUT TEST ). 

Is the brake pedal position switch circuit OK? 

YES: Substitute a known-good ECM/PCM, and recheck. 

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If the problem is gone, replace the original ECM/PCM.  

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If the problem continues, replace the VSA modulator-control unit (see VSA 
MODULATOR-CONTROL UNIT REMOVAL & INSTALLATION ).  

NO: Repair the brake pedal position switch circuit.  

DTC 71: DIFFERENT DIAMETER TIRE 

1. Clear the DTC using the HDS (see HOW TO CLEAR DTCS ).  

2. Disconnect the HDS from the 16P DLC.  

3. Turn the ignition switch OFF, then turn it ON (II) again.  

4. Test-drive the vehicle. 

Does the ABS indicator come on, and is DTC 71 indicated? 

YES: Go to step 5.  

NO: Intermittent failure; confirm that tire inflation is set to spec. The vehicle is OK at this 
time.  

5. Check that all four tires are the specified size and are inflated to the proper specification. 

Are all four tires the correct size and properly inflated? 

YES: Go to step 6.  

NO: Install the correct tires or set the tires to the correct inflation, and retest.  

6. With the vehicle on level ground, mark each tire with a small spot of grease. Roll the vehicle until each of 

the tires makes two grease spots on the floor.  

7. Measure and record the distance between the two grease spots. 

Is the distance between the shortest and the longest measurement more than 10 %? 

YES: Replace the tire/tires that is smaller or larger than the others.  

NO: Replace the VSA modulator-control unit (see VSA MODULATOR-CONTROL 
UNIT REMOVAL & INSTALLATION ).  

DTC 81: CENTRAL PROCESSING UNIT (CPU) 

1. Check for other DTCs. 

Is another DTC indicated? 

 

2004 Acura TSX 

2004 BRAKES Vehicle Stability Assist System - TSX

  

 

YES: Do the appropriate troubleshooting for the DTC.  

NO: Go to step 2  

2. Clear the DTC using the HDS (see HOW TO CLEAR DTCS ).  

3. Disconnect the HDS from the 16P DLC.  

4. Turn the ignition switch OFF, then turn it ON again.  

5. Test-drive the vehicle. 

Does the ABS indicator come on, and is DTC 81 indicated? 

YES: Go to step 6.  

NO: Intermittent failure; the vehicle is OK at this time.  

6. Disconnect the VSA control unit 47P connector.  

7. Start the engine.  

8. Measure the voltage between the VSA control unit 47P connector terminal No. 35 and body ground. 

Is there 1 V or more? 

YES: Repair short to power in the wire between the VSA modulator-control unit, the yaw 
rate-lateral acceleration sensor, and the steering angle sensor.  

NO: Go to step 9.  

 

2004 Acura TSX 

2004 BRAKES Vehicle Stability Assist System - TSX

  

 

Fig. 62: Measuring The Voltage Between The VSA Control Unit 47P Connector Terminal No. 
35 & Body Ground 

9. Check for continuity between the VSA control unit 47P connector terminal No. 35 and body ground. 

Is there continuity? 

YES: Repair short to body ground in the wire between the VSA modulator-control unit, the 
yaw rate-lateral acceleration sensor, and the steering angle sensor.  

NO: Check for loose terminals in the VSA control unit 47P connector. If necessary, 
substitute a known-good VSA modulator-control unit, and recheck (see VSA 
MODULATOR-CONTROL UNIT REMOVAL & INSTALLATION ). 

 

2004 Acura TSX 

2004 BRAKES Vehicle Stability Assist System - TSX

  

 

Fig. 63: Checking For Continuity Between The VSA Control Unit 47P Connector Terminal 
No. 35 & Body Ground 

DTC 83: ECM/PCM 

1. Check the DTC. 

Is DTC 86 indicated? 

YES: Do the troubleshooting for DTC 86.  

NO: Go to step 2.  

2. Clear the DTC using the HDS (see HOW TO CLEAR DTCS ).  

3. Disconnect the HDS from the 16P DLC.  

4. Turn the ignition switch OFF, then turn it ON (II) again.  

5. Test-drive the vehicle. 

Do the VSA and VSA activation indicators come on, and is DTC 83 indicated?

 

2004 Acura TSX 

2004 BRAKES Vehicle Stability Assist System - TSX