Code No. U1015 FCM/LDW/AHB Parity/Toggle bit error


caution Before 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.

DIAGNOSIS CODE SET CONDITIONS
The ASC-ECU will set the diagnosis code when it receives an implausible signal from the FCM/LDW/AHB-ECU.

PROBABLE CAUSES

  • Wiring harness or connector failure of CAN bus line
  • Malfunction of FCM/LDW/AHB-ECU
  • Malfunction of ASC-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q. 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. M.U.T.-III other system diagnosis code
Is diagnosis code No.C1798 also set in the FCM/LDW/AHB-ECU?

Q. Is diagnosis code No. C1798 set?
Troubleshoot the relevant diagnosis code (Refer to ).
Go to Step 3

STEP 3. Check whether the diagnosis code is set again.
(1)Erase the diagnosis code.
(2)Ignition switch "LOCK" (OFF)
(3)Ignition switch "ON"

Q. Is diagnosis code No.U1015 set?
Replace the hydraulic unit (integrated with ASC-ECU).
The procedure is complete.