Code No. C1753:
ACC/FCM Radar Blockage Detected
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When the ACC/FCM-ECU is replaced, calibrate the
radar (refer to  ).
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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 or FCM temporarily not available") on the combination
meter.
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OPERATION
The ACC/FCM-ECU monitors whether the radar or its surrounding area is contaminated
or its beam is blocked by foreign material.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when any of the following conditions is detected:
- If any of the following conditions are satisfied with the ACC ON/OFF switch
or the Forward collision mitigation system (FCM) and Ultrasonic misacceleration Mitigation System
(UMS) ON/OFF switch ON, the system will determine that the radar detection performance
is deteriorated.
- The radar or its surrounding area is contaminated with dirt or foreign material (snow
or ice).
- The system can not monitor a vehicle-travelling-ahead steadily due to a water splash,
etc.
- The system receives little radar reflection from a distance (traffic is not heavy
and free of obstacles, or the obstacles are covered with snow).
PROBABLE CAUSES
- The radar or its surrounding area is contaminated by dirt or foreign material,
etc.
- Improperly installed ACC/FCM-ECU
- Malfunction of the ACC/FCM-ECU
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STEP 1. Check the radar or its surrounding area for dirt
or foreign material.
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(1)Wipe off the dirt or foreign material from the ACC/FCM-ECU’s
radar or its surrounding area.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(5)Press the ACC ON/OFF switch to turn the ACC system to ON.
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(6)Drive the vehicle for approximately 5 minutes.
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(7)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. C1753 set?
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 Go to Step 2.
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 This diagnosis is complete.
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STEP 2. Check whether the ACC/FCM-ECU is installed properly.
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Check whether the ACC/FCM-ECU is installed correctly (Refer to ).
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Q.
Is the check result normal?
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Go to Step 3.
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Reinstall the ACC/FCM-ECU correctly (Refer to ).
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STEP 3. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set in the ACC/FCM-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(4)Press the ACC ON/OFF switch to turn the ACC system to ON.
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(5)On completion, check that the diagnosis code is set again.
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Q.
Is diagnosis code No. C1753 set?
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Replace the ACC/FCM-ECU (Refer to ).
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Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent
Malfunction).
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