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DTC U1015 FCM/LDW/AHB Parity/Toggle bit error
 
 
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
The ASC-ECU will set the DTC when it receives an implausible signal from the FCM/LDW/AHB-ECU.
 
 
 
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.-III) CAN bus diagnostics
(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) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
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 3.
 
STEP 2. Scan tool (M.U.T.-III) 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) Ignition switch "LOCK" (OFF)
(3) Ignition switch "ON"
Is DTC No.U1015 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
The procedure is complete.