Manufacturer Code Charts: 46
Adaptive Cruise Control (ACC) DTC Troubleshooting: 46
DTC 46:
Cal FL Brake Fluid Pressure Sensor Malfunction
NOTE: 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. Start the engine, and press the MAIN switch ON.
2. Clear the DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.
3. Select ADAPTIVE CRUISE CONTROL (ACC) from the MAIN menu, then enter the FUNCTION TEST.
4. Activate BRAKE ACTUATOR 3 from the FUNCTION TEST menu.
5. Watch the ACC indicator.
Does the ACC indicator come on?
YES -
Go to step 6.
NO -
Intermittent failure, the system is OK at this time. Check for loose or poor connections.�
6. Check for DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.
Is DTC 46 indicated?
YES -
Go to step 7.
NO -
Troubleshoot the indicated DTC(s). If there are no DTCs, the system is OK at this time.�
7. Without the brake pedal pressed, check the left front brake fluid pressure voltage (LF BRAKE P) with the HDS.
Is there about 0.5 V?
YES -
Go to step 8.
NO -
Go to step 11.
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 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, 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 11.
11. Press the engine start/stop button to select the OFF mode.
12. Disconnect the ACC unit 20P connector.
13. Measure the resistance between ACC unit 20P connector terminal No. 5 and body ground. There should be an open circuit or at least 1 MOhms.
Is the resistance as specified?
YES -
Go to step 14.
NO -
Repair a short to ground in the wire between the ACC unit and the left front brake fluid pressure sensor.�
14. Disconnect the left front brake fluid pressure sensor 3P connector.
15. Connect left front brake fluid pressure sensor 3P connector terminal No. 2 and body ground with a jumper wire.
16. Measure the resistance between ACC unit 20P connector terminal No. 5 and body ground. There should be less than 1.0 Ohms.
Is the resistance as specified?
YES -
Go to step 17.
NO -
Repair an open in the wire between the ACC unit and the left front brake fluid pressure sensor.�
17. Remove the jumper wire from the left front brake fluid pressure sensor.
18. Reconnect all connectors.
19. Press the engine start/stop button to select the ON mode.
20. Measure the voltage between ACC unit 20P connector terminals No. 3 and No. 5. There should be about 5 V.
Is the voltage as specified?
YES -
Go to step 21.
NO -
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.�
21. Press the engine start/stop button to select the OFF mode.
22. Disconnect the ACC unit 20P connector.
23. Measure the resistance between ACC unit 20P connector terminal No. 14 and body ground. There should be an open circuit or at least 1 MOhms.
Is the resistance as specified?
YES -
Go to step 24.
NO -
Repair a short to ground in the wire between the ACC unit and the left front brake fluid pressure sensor.�
24. Disconnect the left front brake fluid pressure sensor 3P connector.
25. Connect left front brake fluid pressure sensor 3P connector terminal No. 3 to body ground with a jumper wire.
26. Measure the resistance between ACC unit 20P connector terminal No. 14 and body ground. There should be less than 1.0 Ohms.
Is the resistance as specified?
YES -
Go to step 27.
NO -
Repair an open in the wire between the ACC unit and the left front brake fluid pressure sensor.�
27. Measure the resistance between ACC unit 20P connector terminal No. 5 and body ground. There should be an open circuit or at least 1 MOhms.
Is the resistance as specified?
YES -
Go to step 28.
NO -
Repair a short in the wires between the PRESS FL line and the VCC line.�
28. Connect left front brake fluid pressure sensor 3P connector terminal No. 1 to body ground with a jumper wire.
29. Measure the resistance between ACC unit 20P connector terminal No. 3 and body ground. There should be less than 1.0 Ohms.
Is the resistance as specified?
YES -
Go to step 30.
NO -
Repair an open in the wire between the ACC unit and the left front brake fluid pressure sensor.�
30. Remove the jumper wire from the left front brake fluid pressure sensor.
31. Reconnect all connectors.
32. Start the engine.
33. 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 35.
NO -
Go to step 34.
34. Check for DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.
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.�
35. Press the MAIN switch ON.
36. Clear the DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.
37. Select ADAPTIVE CRUISE CONTROL (ACC) from the DRIVING SUPPORT menu, then enter the FUNCTION TEST.
38. Activate BRAKE ACTUATOR 3 from the FUNCTION TEST menu.
39. Check for DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.
Is DTC 46 indicated?
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 -
The system is OK at this time. Check for loose or poor connections.�