Adaptive Cruise Control System

Adaptive Cruise Control (ACC) DTC Troubleshooting: 34, 35, 36

DTC 34:

Master Cylinder Brake Fluid Pressure Sensor Circuit Open/Short

DTC 35:

Master Cylinder Brake Fluid Pressure Sensor Center Position Error

DTC 36:

Master Cylinder Brake Fluid Pressure Sensor Shift Error

1. Check for VSA system DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

Are any DTCs indicated?

YES -

Troubleshoot the indicated VSA system DTC(s).

NO -

Go to step 2.

2. Clear the DTCs with the HDS.

3. Watch the CMBS indicator.

Does the CMBS indicator go off?

YES -

Intermittent failure, the system is OK at this time. Check for loose or poor connections.

NO -

Go to step 4.

4. Press the brake pedal.

5. Watch the CMBS indicator.

Does the CMBS indicator go off?

YES -

Intermittent failure, the system is OK at this time. Check for loose or poor connections.

NO -

Go to step 6.

6. Check for DTCs with the HDS.

Is DTC 34, 35, or 36 indicated?

YES -

Go to step 7.

NO -

Troubleshoot the indicated DTC(s).

7. With the brake pedal released, check the master cylinder brake fluid pressure voltage (BRAKE P) with the HDS.

Is there about 0.5 V?

YES -

Go to step 8.

NO -

Go to the VSA system troubleshooting Reading and Clearing Diagnostic Trouble Codes.

8. Test the brake booster Testing and Inspection.

9. Start the engine, then press the brake pedal with about 314 N (32.0 kgf,70.6 lbf) pressure.

10. Check the master cylinder brake fluid pressure voltage (BRAKE P) with the HDS.

Is there about 2.5 V?

YES -

Go to step 11.

NO -

Go to the VSA system troubleshooting Reading and Clearing Diagnostic Trouble Codes.

11. Check the BRAKE SW (N.O.) in the ACC DATA LIST with the HDS.

Does the indication show ON when the brake pedal is pressed, and show OFF when the brake pedal is released?

YES -

Check for loose or poor connections. If OK, update the ACC unit Testing and Inspection, then recheck. If the ACC unit was already updated, replace the ACC unit Service and Repair.

NO -

Go to step 12.

12. Check for DTCs with the HDS.

Is DTC 60, 110, or 111 indicated?

YES -

Troubleshoot the indicated DTC(s).

NO -

Troubleshoot the brake pedal position switch signal circuit Brake Pedal Position Switch Signal Circuit Troubleshooting.