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DTC C1805 FCM/LDW/AHB malfunction
 
 
cautionBefore replacing the ECU, ensure that the communication circuit is normal.
 
 
OPERATION
The ASC-ECU communicates with the FCM/LDW/AHB-ECU via CAN bus lines.
 
 
 
DTC SET CONDITIONS
If the ASC-ECU receives an abnormal signal from the FCM/LDW/AHB-ECU with the FCM activated, it will set the DTC.
 
 
 
TROUBLESHOOTING HINTS
  • Wiring harness or connector failure of CAN bus line
  • Malfunction of FCM/LDW/AHB-ECU
  • Malfunction of ASC-ECU
 
 
 
 
DIAGNOSIS
STEP 1. Scan tool (M.U.T.-IIISE) CAN bus diagnostics.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Turn on the power supply mode of the electric motor switch.
(3) Diagnose the CAN bus line.
(4) Turn off the power supply mode of the electric motor switch.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
 
STEP 2. Scan tool (M.U.T.-IIISE) other system DTC.
Is DTC No.C1798 also set in the FCM/LDW/AHB-ECU?
Is DTC No. C1798 set?
Troubleshoot the relevant DTC (Refer to ).
Go to Step 3
 
STEP 3. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
Is DTC No.C1805 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
The procedure is complete.