P1678

P1678-ECU SENSOR ADJUSTMENT REQUIRED

For a complete wiring diagram Refer to Diagrams/Electrical.

- When Monitored:

Continuously monitored with the engine running, ACC Module voltage is at battery voltage, and the ACC Module in normal mode.
- Set Condition:

There is a horizontal misalignment between Sensor Axis and the vehicle driving axis greater than the performance threshold. The ACC module will disable the Adaptive Cruise Control (ACC) system and the SERVICE ACC message will display in the CCN. The DTC will be cleared after the ACC Module sees 100 consecutive key cycles of the STORED DTC.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test

1.ADAPTIVE CRUISE CONTROL ALIGNMENT

NOTE: Vehicles that have had the suspension modified and/or a aftermarket grill installed that blocks the ACC sensor can cause the Adaptive Cruise Control (ACC) system not to operate properly.

Using the Scan Tool, perform the ADAPTIVE CRUISE CONTROL ALIGNMENT Procedure. Adjustments

Was the ADAPTIVE CRUISE CONTROL ALIGNMENT successful?

Yes

- Test Complete
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test

No

- Ensure the lens is free of dirt, damage or other obstructions that would hinder the performance of the ACC imager lens. Inspect for vehicle damage the may not allow that ACC system to be aligned properly. Repair as necessary. If no problems are found, replace the ACC Module.