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DTC U1428: Sensor Cluster (CAN message)
 
 
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 - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • When the hydraulic unit (integrated with ASC-ECU) is replaced, after vehicle information from ETACS-ECU is registered (power supply mode of the electric motor switch: OFF from ON), always carry out the calibration of all sensors (steering wheel sensor, G and yaw rate sensor, and brake fluid pressure sensor) at one time (Refer to GROUP 35C - All Sensor Calibration ).
  • Do not drop the G and yaw rate sensor or subject it to a shock.
 
 
DTC SET CONDITIONS
The PHEV-ECU sets DTC U1428 when the G and yaw rate sensor fails.
 
 
 
PROBABLE CAUSES
  • Malfunction of the G and yaw rate sensor.
  • The power supply to the ASC-ECU fails.
  • Malfunction of CAN bus line.
  • Malfunction of the steering wheel sensor.
  • Malfunction of the PHEV-ECU.
 
 

 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.
Diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check whether the ASC-ECU related DTC is set or not (Refer to GROUP 35C - Troubleshooting ).
Is the DTC set?
Troubleshoot for the relevant DTC.
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-IIISE), check the data list.
Check whether the PHEV-ECU related data list is set or not (Refer to ).
  • Item No.330: Yaw rate
  • Item No.331: Lateral acceleration
  • Item No.332: Longitudinal acceleration
Is the check result normal?
Go to Step 4.
Replace the hydraulic unit (incorporating G and Yaw rate sensor) and then carry out the calibration of the G and yaw rate sensor to make ASC-ECU learn the neutral point (Refer to GROUP 35C - G and yaw rate sensor calibration ).
 
STEP 4. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.
(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.
(4) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).