68-21

VSA DTC Troubleshooting: 68-21

DTC 68-21: Brake Pedal Position Switch Stuck OFF

1. Start the engine.

2. Check the BRAKE PRESS in the VSA DATA LIST with the HDS. Do not press the brake pedal.

Is there 10 MPa or less?
YES - Go to step 3.

NO - Check for brake drag or a misadjusted brake pedal position switch. If they are normal, replace the VSA modulator-control unit. Service and Repair


3. Check the BRAKE SWITCH in the VSA DATA LIST with the HDS while moving the brake pedal.

Does it indicate ON when the pedal is pressed, and OFF when the pedal is released?
YES - 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. How To Troubleshoot The VSA System (With VSA)

NO - Go to step 4.


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

5. Disconnect the brake pedal position switch 4P connector.

6. Connect the brake pedal position switch 4P connector terminals No. 1 and No. 2 to 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.

Does it indicate ON?
YES - Check the brake pedal position switch adjustment. Adjustments If it is OK, replace the brake pedal position switch.

NO - 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.

Is there continuity?
YES - Update the ECM/PCM if it does not have the latest software: Except Si model, ECM/PCM Update (A/T) Si model, or substitute a known-good ECM/PCM: Except Si model, Initial Inspection and Diagnostic Overview Si model, Initial Inspection and Diagnostic Overview 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: Except Si model, Service and Repair Si model. Service and Repair

NO - Repair open in the wire between the ECM/PCM and the brake pedal position switch.