Adaptive Cruise Control (ACC) Unit DTC 50: Cal FR Brake Fluid Pressure Sensor Malfunction NOTE: 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. Start the engine, and turn the main switch ON.

1. Clear the DTCs with the HDS.

1. Select ADAPTIVE CRUISE CONTROL (ACC) from the DRIVING SUPPORT menu, then enter the FUNCTION TEST.

1. Activate BRAKE ACTUATOR 3 from the FUNCTION TEST menu.

1. Watch the adaptive cruise control (ACC)/LKAS indicator.

Is the adaptive cruise control (ACC)/LKAS indicator orange?

YES | - | Go to Step 9 .
NO | - | Go to Step 6 .

1. Activate BRAKE ACTUATOR 3 again.

1. While the brake actuator is operating, press the brake pedal.

1. Watch the adaptive cruise control (ACC)/LKAS indicator.

Does the adaptive cruise control (ACC)/LKAS indicator stay orange?

YES | - | Go to Step 9 .
NO | - | Intermittent failure. The system is OK at this time. Check for loose or poor connections.■

1. Check for DTCs with the HDS.

Is DTC 50 indicated?

YES | - | Go to Step 10 .
NO | - | Troubleshoot the indicated DTC(s). If there are no DTCs, the system is OK at this time.■

1. 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 11 .
NO | - | Go to Step 14 .

1. Do the brake booster test.

1. Press the brake pedal with about 314 N (32 kgf, 71 lbf) pressure.

1. Check the right 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, check for loose or poor connections. If OK, replace the adaptive cruise control (ACC) unit. ■
NO | - | Go to Step 14 .

1. Turn the ignition switch OFF.

1. Disconnect the 20P connector from the adaptive cruise control (ACC) unit.

1. Check for continuity between the adaptive cruise control (ACC) unit 20P connector No. 5 terminal and body ground.

Is there continuity?

YES | - | Repair a short to ground in the wire between the adaptive cruise control (ACC) unit and the right front pressure sensor.■
NO | - | Go to Step 17 .

1. Disconnect the 3P connector from the right front pressure sensor.