68-21

VSA DTC Troubleshooting: 68-21

DTC 68-21:

Brake Pedal Position Switch Stuck OFF

NOTE: Troubleshoot any fuel and emissions DTCs first.

1. Start the engine.

2. Check the BRAKE PRESSURE 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 Symptom Related Diagnostic Procedures or a misadjusted brake pedal position switch Adjustments. 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.�

NO -

Go to step 4.

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

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

6. 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.

Does it indicate ON?

YES -

Check the brake pedal position switch adjustment Adjustments. If it is OK, replace the brake pedal position switch Adjustments.�

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): Except Si model , Si model Service and Repair.

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, Si model ECM/PCM Update, or substitute a known-good ECM/PCM: Except Si model, Si model, then go to step 1 and recheck. If DTCs are not indicated, ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM: Except Si model , Si model Service and Repair.

NO -

Repair an open in the wire between the ECM/PCM and the brake pedal position switch.�