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DTC C1777 System fail detected (ASC)
 
 
caution
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
 
 
OPERATION
FCM/LDW/AHB-ECU communicates with the ASC-ECU via the CAN bus lines.
 
 
DTC SET CONDITION
This DTC is set when the abnormality below is detected:
  • A signal, which indicates a defective ASC system, is received from the ASC-ECU.
 
 
TROUBLESHOOTING HINTS
  • Defective ASC circuit system
  • Malfunction of the FCM/LDW/AHB-ECU
 
 
DIAGNOSIS
STEP 1. Scan tool (M.U.T.-III) other system DTC.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Check the ASC DTC.
Is the DTC set?
Perform the relevant troubleshooting (Refer to ).
Go to Step 2.
 
STEP 2. Check whether the DTC is set again.
Check again if the DTC is set in the FCM/LDW/AHB-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if DTC is set.
Is the DTC 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 ).