DTC 43
DTC 43: Cal FL Brake System MalfunctionNOTE: In this troubleshooting, you will operate the ACC BRAKE (brake actuator 3) continuously 4 or 5 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 adaptive cruise control (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 adaptive cruise control (ACC) indicator.
Is the adaptive cruise control (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 adaptive cruise control (ACC) indicator.
Does the adaptive cruise control (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 43 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 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 with 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 adaptive cruise control (ACC) switch ON.
18. Clear the DTCs with the HDS.
19. Activate the BRAKE ACTUATOR 3 from the FUNCTION TEST.
20. Check for DTCs with the HDS.
Is DTC 43 indicated?
YES - Check the pressure sensor. If OK, go to step 21.
NO - Troubleshoot the indicated DTC. If there is no DTC, the system is OK at this time.
21. Check the left front brake fluid pressure voltage (LF BRAKE P) with the HDS.
Is there about 0.5 V?
YES - Go to step 22.
NO - Go to step 25.
22. Do the brake booster test.
23. Press the brake pedal with about 314 N (32 kgf, 70.6 lbf) pressure.
24. Check the left front brake fluid pressure voltage (LF BRAKE P) with the HDS.
Is there about 2.5 V?
YES - The left front brake fluid pressure signal is OK, check for loose or poor connections. If OK, replace the adaptive cruise control (ACC) unit.
NO - Go to step 25.
25. Check for DTCs with the HDS.
Is DTC 43 indicated?
YES - Check for loose or poor connections. If OK, replace the adaptive cruise control (ACC) unit.
NO - Troubleshoot the indicated DTC. If there is no DTC, the system is OK at this time.