Code No. C1777:
System Fail Detected (ASC)
caution |
- If there is any problem in the
CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the
CAN bus lines (Refer to GROUP 54C - Troubleshooting
).
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
- When the ACC/FCM-ECU is replaced, calibrate the radar (refer to
).
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OPERATION
The ACC/FCM-ECU receives system fault information from the ASTC-ECU.
DIAGNOSIS CODE SET CONDITION
The ACC/FCM-ECU sets the diagnosis code when it receives system fault information from
the ASTC-ECU.
PROBABLE CAUSES
- Malfunction of the CAN bus line
- Malfunction of the hydraulic unit assembly (integrated with ASTC-ECU)
- Malfunction of the ACC/FCM-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics.
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Use M.U.T.-III to perform the CAN bus diagnosis.
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Q.
Is the check result normal?
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Go to Step 2.
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Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).
On completion, go to Step 2.
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STEP 2. Use M.U.T.-III to confirm a diagnosis code of other systems.
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caution |
If you have started this procedure as a result of diagnosis procedure for
diagnosis code No. C1804, which is set in the ASTC-ECU, go to Step 3 .
It is not necessary to troubleshoot the diagnosis code set in the ASTC-ECU.
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Check if any diagnosis code other than below is set in the ASTC-ECU (Refer to GROUP 35C - Troubleshooting <ASTC-ECU>,
Diagnosis Function).
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- Code No. C1804: ACC deactivation disagreement
- Code No. U1014: FCM (CAN message)
- Code No. U1101: A/T-ECU timeout error
- Code No. U15A0: ACC/FCM-ECU CAN timeout
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Q.
Is any of the diagnosis code other than above set?
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Troubleshoot the ASTC-ECU diagnosis code (Refer to GROUP 35C - Troubleshooting <ASTC-ECU>, Diagnosis
Code Chart ).
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Go to Step 3.
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STEP 3. Use M.U.T.-III to confirm a diagnosis code of the systems.
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Check if other diagnosis code is set in the ACC/FCM-ECU (Refer to ).
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Q.
Is other diagnosis code set?
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Troubleshoot the ACC/FCM-ECU diagnosis code (Refer to ).
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Go to Step 4.
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STEP 4. 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. C1777 set?
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Replace the ACC/FCM-ECU (Refer to ).
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Go to Step 5.
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STEP 5. 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. C1777 set?
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Replace the hydraulic unit assembly (integrated with ASTC-ECU) {Refer
to GROUP 35C - Hydraulic Unit Assembly}.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction).
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