Manufacturer Code Charts: 49
Adaptive Cruise Control (ACC) DTC Troubleshooting: 49
DTC 49:
Cal FR Brake Fluid Pressure Sensor Center Position Error
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to ON (II), then wait for 10 seconds.
3. Watch the ACC indicator.
Does the ACC indicator (amber) go 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 (amber) go 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 49 indicated?
YES -
Go to step 6.
NO -
Troubleshoot the indicated DTC(s). If there are no DTCs, the system is OK at this time.�
6. Turn the ignition switch to LOCK (0).
7. Disconnect the ACC unit 20P connector.
8. 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 9.
NO -
Repair a short to ground in the wire between the ACC unit and the right front brake fluid pressure sensor.�
9. Disconnect the right front brake fluid pressure sensor 3P connector.
10. Connect right front brake fluid pressure sensor 3P connector terminal No. 2 to body ground with a jumper wire.
11. 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 12.
NO -
Repair an open in the wire between the ACC unit and the right front brake fluid pressure sensor.�
12. Remove the jumper wire from the right front brake fluid 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. There should be about 5 V.
Is the voltage as specified?
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 ACC unit 20P connector.
18. Measure the resistance between ACC unit 20P connector terminal No. 6 and body ground. There should be an open circuit or at least 1 MOhms.
Is the resistance as specified?
YES -
Go to step 19.
NO -
Repair a short to ground in the wire between the ACC unit and the right front brake fluid pressure sensor.�
19. Disconnect the right front brake fluid pressure sensor 3P connector.
20. Connect right front brake fluid pressure sensor 3P connector terminal No. 3 to body ground with a jumper wire.
21. Measure the resistance between ACC unit 20P connector terminal No. 6 and body ground. There should be less than 1.0 Ohms.
Is the resistance as specified?
YES -
Go to step 22.
NO -
Repair an open in the wire between the ACC unit and the right front brake fluid pressure sensor.�
22. Measure the resistance between ACC unit 20P connector terminals No. 5 and No. 6. There should be an open circuit or at least 1 MOhms.
Is the resistance as specified?
YES -
Go to step 23.
NO -
Repair a short in the wire between the PRESS FR line and the VCC line.�
23. Connect right front brake fluid pressure sensor 3P connector terminal No. 1 to body ground with a jumper wire.
24. 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 25.
NO -
Repair an open in the wire between the ACC unit and the right front brake fluid pressure sensor.�
25. Remove the jumper wire from the right front brake fluid pressure sensor.
26. Reconnect all connectors.
27. Turn the ignition switch to ON (II), then wait for 10 seconds.
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 49 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(s).�
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. 6.There should be voltage between 0.4 - 0.6 V.
Is the voltage as specified?
YES -
Go to step 32.
NO -
Faulty right front brake fluid pressure sensor; replace the right front brake fluid pressure sensor
32. Clear the DTCs with the HDS.
33. Watch the ACC indicator.
Does the ACC unit indicator (amber) go 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 49 indicated?
YES -
Check for loose or poor connections. If OK, update the ACC unit Programming and Relearning, then recheck. If the ACC unit was already updated, 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.�