Code No. C1777
System fail detected (ASC)
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- Whenever the ECU is replaced, ensure
that the CAN bus lines are normal.
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OPERATION
FCM/LDW/AHB-ECU communicates with the ASC-ECU via the CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality below is detected:
- A signal, which indicates a defective ASC system, is received from the ASC-ECU.
PROBABLE CAUSES
- Defective ASC circuit system
- Malfunction of the FCM/LDW/AHB-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III other system diagnosis code.
Check the ASC diagnosis code (Refer to 
).
Q.
Is the diagnosis code set?
Perform the relevant troubleshooting (Refer to ).
Go to Step 2.
STEP 2. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the FCM/LDW/AHB-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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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the FCM/LDW/AHB-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction).