Code No. C1774: Alignment Sensor too Far (Lower)

caution

When the ACC/FCM-ECU is replaced, calibrate the radar (refer to

note

The radar may not function normally if foreign object or dirt (snow or ice) is adhered on the radar or its surrounding area, or the road condition is bad due to a severe weather (heavy rain or snow). In that case, the system will deactivate the ACC and/or FCM as system protection and display an alert message ("ACC/FCM RADAR BLOCKED") on the combination meter.

OPERATION

ACC/FCM-ECU monitors the radar calibration.

DIAGNOSIS CODE SET CONDITION

This diagnosis code is set when the abnormality below is detected:

The ACC/FCM-ECU detects an angle of 3.0 degree angle or more in the lower direction, which exceeds an automatic compensation limit.

note

A diagnosis code is not set as a historic fault.

PROBABLE CAUSES

Dirt or foreign material on the radar
Malfunction of the wheel alignment
Distorted or deformed vehicle
Improperly installed ACC/FCM-ECU
Malfunction of the ACC/FCM-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check the ACC/FCM-ECU radar for contamination.

Check the ACC/FCM-ECU radar for contamination.

Q. Is the ACC/FCM-ECU radar contaminated?

	Clean the ACC/FCM-ECU radar, and then go to Step 2.

	Go to Step 3.

STEP 2. Check whether the diagnosis code is set again.

Drive the vehicle at 15 km/h or more for approximately 30 minutes. Check whether the ACC/FCM-ECU sets any diagnosis code.

Q. Is diagnosis code No. C1774 set?

	Go to Step 3.

	This diagnosis is complete.

STEP 3. ACC/FCM-ECU radar calibration.

Perform calibration of ACC/FCM-ECU radar calibration (Refer to

Q. Has the calibration succeeded?

	This diagnosis is complete.

	Replace the ACC/FCM-ECU (Refer to ).