Adaptive Cruise Control/CMBS

Adaptive Cruise Control (ACC) DTC Troubleshooting: 45

DTC 45: Cal FL Brake Fluid Pressure Sensor Center Position Error

1. Turn the ignition switch to ON (II).

2. Clear the DTCs with the HDS.

3. Watch the adaptive cruise control (ACC) indicator.

Does the ACC indicator stay off?
YES - Go to step 4.

NO - Go to step 5.


4. Press the brake pedal, and watch the ACC indicator.

Does the ACC indicator stay off?
YES - The system is OK at this time. Check for loose or poor connections.

NO - Go to step 5.


5. Check for DTCs with the HDS.

Is DTC 45 indicated?
YES - Go to step 6.

NO - Troubleshoot the indicated DTC.


6. Turn the ignition switch to LOCK (0).

7. Disconnect the 20P connector from the ACC unit.

8. Check for continuity between ACC unit 20P connector terminal No. 5 and body ground.

Is there continuity?
YES - Repair a short to ground in the wire between the ACC unit and the left front pressure sensor.

NO - Go to step 9.






9. Disconnect the 3P connector from the left front pressure sensor.

10. Connect the left front pressure sensor 3P connector terminal No. 2 to body ground with a jumper wire.






11. Check for continuity between ACC unit 20P connector terminal No. 5 and body ground.

Is there continuity?
YES - Go to step 12.

NO - Repair an open in the wire between the ACC unit and the left front pressure sensor.






12. Remove the jumper wire from the left front pressure sensor.

13. Reconnect all connectors.

14. Turn the ignition switch to ON (II).

15. Measure the voltage between ACC unit 20P connector terminals No. 3 and No. 5.

Is there about 5V?
YES - Go to step 16.

NO - Check for loose or poor connections If OK, replace the ACC unit.. Service and Repair






16. Turn the ignition switch to LOCK (0).

17. Disconnect the 20P connector from the ACC unit.

18. Check for continuity between ACC unit 20P connector terminal No. 14 and body ground.

Is there continuity?
YES - Repair a short to ground in the wire between the ACC unit and the left front pressure sensor.

NO - Go to step 19.






19. Disconnect the 3P connector from the left front pressure sensor.

20. Connect the left front pressure sensor 3P connector terminal No. 3 to body ground with a jumper wire.






21. Check for continuity between ACC unit 20P connector terminal No. 14 and body ground.

Is there continuity?
YES - Go to step 22.

NO - Repair an open in the wire between the ACC unit and the left front pressure sensor.






22. Check for continuity between ACC unit 20P connector terminal No. 5 and body ground.

Is there continuity?
YES - Repair a short in the wire between the PRESS FL line and the VCC line.

NO - Go to step 23.






23. Connect the left front pressure sensor 3P connector terminal No. 1 to body ground with a jumper wire.






24. Check for continuity between ACC unit 20P connector terminal No. 3 and body ground.

Is there continuity?
YES - Go to step 25.

NO - Repair an open in the wire between the ACC unit and the left front pressure sensor.






25. Remove the jumper wire from the left front pressure sensor.

26. Reconnect all connectors.

27. Turn the ignition switch to ON (II).

28. 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 30.

NO - Go to step 29.


29. Check for DTCs with the HDS.

Is DTC 45 indicated?
YES - Go to step 31.

NO - Go to step 30.


30. 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 signal circuit. Brake Pedal Position Switch Signal Circuit Troubleshooting


31. Measure the voltage between ACC unit 20P connector terminals No. 3 and No. 14.

Is the voltage between 0.4-0.6 V?
YES - Go to step 32.

NO - Replace the left front pressure sensor. Service and Repair






32. Clear the DTCs with the HDS.

33. Watch the ACC indicator.

Does the ACC indicator stay off?
YES - The system is OK at this time. Check for loose or poor connections.

NO - Go to step 34.


34. Check for DTCs with the HDS.

Is DTC 45 indicated?
YES - Check for loose or poor connections. If OK, replace the ACC unit. Service and Repair

NO - Troubleshoot the indicated DTC(s). If there are no DTCs, the system is OK at this time.