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DTC U1415 Variant coding not implemented


caution
  • If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - Diagnostic trouble code diagnosis ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • When the DTC U1415 is set in ASC-ECU, the DTC may also be set in ETACS-ECU. When the DTC is set in ETACS-ECU, carry out the diagnosis of the DTC for ETACS-ECU first.
  • When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to , and ).

OPERATION
ASC-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.

DTC SET CONDITIONS
This DTC is set when the variant coding for ETACS-ECU has not been implemented.

PROBABLE CAUSES

  • Variant coding for ETACS-ECU has not been implemented.
  • ASC-ECU malfunction

DIAGNOSIS
Required Special Tools:
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)

    • MB991824: Vehicle Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A

STEP 1. M.U.T.-III CAN bus diagnosis
Use scan tool 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 Diagnostic table ). On completion, go to Step 4.

STEP 2. M.U.T.-III other system DTC
Use scan tool to check that the DTC B222C is set in the ETACS-ECU.

Q. Is the DTC set?
Troubleshoot the relevant DTC, and then go to Step 4.
Go to Step 3.

STEP 3. Check whether the DTC is reset.
(1)Erase the DTC.
(2)Turn the ignition switch to the "OFF" position.
(3)Turn the ignition switch to the "ON" position.
(4)Check that the ABS warning light goes out.
note If the DTC U1415 is not deleted, the ABS warning light keeps illuminating.

Q. Is DTC U1415 set?
Replace the hydraulic unit (ASC-ECU) (Refer to ), and then go to Step 4.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 4. Check whether the DTC is reset.
(1)Erase the DTC.
(2)Turn the ignition switch to the "OFF" position.
(3)Turn the ignition switch to the "ON" position.
(4)Check that the ABS warning light goes out when the ignition switch is turned to the "ON" position.
note If the DTC U1415 is not deleted, the ABS warning light keeps illuminating.

Q. Is DTC U1415 set?
Go to Step 5.
The procedure is complete.

STEP 5. Check whether the DTC is reset.

Q. Is DTC U1415 set?
Return to Step 1.
The procedure is complete.