DTC Troubleshooting: 68-21

DTC 68-21:  Brake Pedal Position Switch Stuck OFF

1.Turn the ignition switch ON (II).

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

Is 0.5 V or less?


YES - Go to 3.


NO - Check for brake drag or a miss-adjusted brake pedal position switch.n


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 pushed, and OFF when 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, the PCM connector A (44P), and the VSA modulator-control unit 37P connector. Refer to intermittent failures troubleshooting.n


NO - Go to 4.


4.Turn the ignition switch OFF.

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

6.Connect brake pedal position switch 4P connector terminal No. 1 and No. 2 to with a jumper wire.

 

7.Turn the ignition switch ON (II).

8.Check the BRAKE SWITCH in the VSA DATA LIST with the HDS.

Does it indicate ON?


YES - Substitute a known-good PCM, then go to 1 and recheck. If DTCs are not indicated,replace the original PCM: R18A1 engine model, K20Z2 engine model.n


NO - Go to 9.


9.Disconnect the jumper wire.

10.Turn the ignition switch OFF.

11.Short the SCS line with the HDS.

12.Disconnect PCM connector A (44P).

13.Check for continuity between brake pedal position switch 4P connector terminal No. 2 and PCM connector A (44P) terminal No. 40.

 

Is there continuity?


YES - Replace the brake pedal position switch.n


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