Active Stability Control System (ASC)

DTC U1415: Variant coding not completed

CAUTION:

- If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines Initial Inspection and Diagnostic Overview ).
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
- When diagnostic trouble code No. U1415 is set in ASC-ECU, the diagnostic trouble code may also be set in ETACS-ECU. When the diagnostic trouble code is set in ETACS-ECU, perform the diagnosis of the diagnostic trouble code for ETACS-ECU first.
- When the hydraulic unit (integrated with ASC-ECU) is replaced, after turning the ignition switch ON and OFF (vehicle information from ETACS-ECU is registered), always perform the calibration of steering wheel sensor, G and yaw rate sensor, brake fluid pressure sensor, cut valve, and inlet valve (Refer to G and Yaw Rate Sensor Calibration , Testing and Inspection , Master Cylinder Brake Fluid Pressure Sensor Calibration , and Testing and Inspection ).

CIRCUIT OPERATION

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

DTC SET CONDITIONS

This diagnostic trouble code is set when the variant coding for ETACS-ECU has not been completed.

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. Using scan tool MB991958, diagnose the CAN bus lines.

Using scan tool MB991958, diagnose the CAN bus lines.

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the CAN bus lines CAN Bus Diagnostics Chart).
After repairing the CAN bus line, go to Step 5.
STEP 2. Scan tool DTC for other system

Use scan tool to check that the diagnostic trouble code B222C is set in the ETACS-ECU.

Q. Is any DTC set?

YES Perform troubleshooting for the diagnostic trouble code that is set. Then go to Step 4.
NO Go to Step 3.
STEP 3. Check for DTC for other system

Q. Is DTC U1417 set?

YES Perform the troubleshooting for diagnostic trouble code No. U1417 (Refer to Active Stability Control System (ASC)).
NO Go to Step 4.
STEP 4. Check whether the DTC is reset.

(1)Erase the DTC.

(2)Ignition switch "LOCK" (OFF)

(3)Ignition switch "ON"

(4)Check that the ABS warning light is extinguished.

Q. Is DTC U1415 set?

YES Replace the hydraulic unit (integrated with ASC-ECU) (Refer to Service and Repair).
Then go to Step 5.
NO Intermittent malfunction How to Cope With Intermittent Malfunctions)/
STEP 5. Check whether the DTC is reset.

(1)Erase the DTC.

(2)Ignition switch "LOCK" (OFF)

(3)Ignition switch "ON"

(4)Check that the ABS warning light is extinguished.

Q. Is DTC U1415 set?

YES Return to Step 1.
NO The procedure is complete.