Adaptive Cruise Control/CMBS
Adaptive Cruise Control (ACC) DTC Troubleshooting: 45
DTC 45: Cal FL Brake Fluid Pressure Sensor Center Position Error
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to ON (II).
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(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. 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 brake fluid pressure sensor.
NO - Go to step 9.
9. Disconnect the left front brake fluid pressure sensor 3P connector.
10. Connect left front brake fluid 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 brake fluid pressure sensor.
12. Remove the jumper wire from the left 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.
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 ACC unit 20P connector.
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 brake fluid pressure sensor.
NO - Go to step 19.
19. Disconnect the left front brake fluid pressure sensor 3P connector.
20. Connect left front brake fluid 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 brake fluid 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 left front brake fluid 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 brake fluid pressure sensor.
25. Remove the jumper wire from the left front brake fluid 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(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. 14.
Is the voltage between 0.4-0.6 V?
YES - Go to step 32.
NO - Replace the left front brake fluid 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.