DTC 47
DTC 47: Cal FR Brake System MalfunctionNOTE: In this troubleshooting, you will operate the ADAPTIVE CRUISE CONTROL (ACC) BRAKE (brake actuator 3) continuously four or five times using the FUNCTION TEST with the HDS. During this operation, the VSA modulator-control unit may stop working. This means the VSA modulator-control unit has shut down to protect the system from overheating during continuous operation.
If the VSA modulator-control unit stops working, wait for a few minutes until the VSA modulator-control unit cools down, then restart the troubleshooting.
1. Check for VSA System DTCs with the HDS.
Are any DTCs indicated?
YES - Troubleshoot the indicated VSA system DTC(s).
NO - Go to step 2.
2. Start the engine, and turn the ACC switch ON.
3. Clear the DTCs with the HDS.
4. Select ADAPTIVE CRUISE CONTROL (ACC) from the DRIVING SUPPORT menu, then enter the FUNCTION TEST.
5. Activate BRAKE ACTUATOR 3 from the FUNCTION TEST menu.
6. Watch the ACC indicator.
Is the ACC indicator amber?
YES - Go to step 10.
NO - Go to step 7.
7. Activate BRAKE ACTUATOR 3 again.
8. While the brake actuator is operating, press the brake pedal.
9. Watch the ACC indicator.
Does the ACC indicator stay amber?
YES - Go to step 10.
NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.
10. Check for DTCs with the HDS.
Is DTC 47 indicated?
YES - Go to step 11.
NO - Troubleshoot the indicated DTC(s). If there are no DTCs, the system is OK at this time.
11. Turn the ignition switch OFF.
12. Press the brake pedal several times, and check the brake pedal travel.
Is the brake pedal travel OK?
YES - Go to step 13.
NO - Inspect the master cylinder.
13. Check for brake fluid leaks.
Are there any fluid leaks?
YES - Repair the brake fluid leak.
NO - Go to step 14.
14. Start the engine.
15. Check the brake switch signal (BRAKE SW (N.O.)) with the HDS.
Does the indication show ON when the brake pedal is pressed, and show OFF when the brake pedal is released?
YES - Go to step 17.
NO - Go to step 16.
16. Check for DTCs with the HDS.
Is DTC 60, 110, or 111 indicated?
YES - Troubleshoot the indicated DTC.
NO - Troubleshoot the brake pedal position switch circuit.
17. Turn the ACC switch ON.
18. Clear the DTCs with the HDS.
19. Select ADAPTIVE CRUISE CONTROL (ACC) from the DRIVING SUPPORT menu, then enter the FUNCTION TEST.
20. Activate BRAKE ACTUATOR 3 from the FUNCTION TEST.
21. Check for DTCs with the HDS.
Is DTC 47 indicated?
YES - Check the pressure sensor. If OK, go to step 22.
NO - Troubleshoot the indicated DTC. If there is no DTC, the system is OK at this time.�
22. Without the brake pedal pressed, check the right front brake fluid pressure voltage (RF BRAKE P) with the HDS.
Is there about 0.5 V?
YES - Go to step 23.
NO - Go to step 26.
23. Test the brake booster.
24. Press the brake pedal with about 314 N (32 kgf, 70.6 lbf) pressure.
25. Check the front brake fluid pressure voltage (RF BRAKE P) with the HDS.
Is there about 2.5 V?
YES - The right front brake fluid pressure signal is OK, replace the ACC unit.
NO - Go to step 26.
26. Check for DTCs with the HDS.
Is DTC 47 indicated?
YES - Check for loose or poor connections. If OK, replace the ACC unit.
NO - Troubleshoot the indicated DTC. If there is no DTC, the system is OK at this time.