DTC U1428: G and Yaw Rate Sensor Data Malfunction
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.
Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
Do not drop the G and yaw rate sensor or subject it to a shock.
When G and yaw rate sensor is replaced, calibrate G and yaw rate sensor (Refer to GROUP 35C - On-vehicle Service).
OPERATION
AWC-ECU communicates with ASC-ECU via the CAN bus lines.
DTC SET CONDITIONS
The DTC is set when abnormality is detected in the G and yaw rate sensor signal received from the ASC-ECU.
PROBABLE CAUSES
Malfunction of the CAN bus line
Malfunction of G and yaw rate sensor
Malfunction of ASC-ECU
Malfunction of AWC-ECU
DIAGNOSIS
STEP 1. Scan tool (M.U.T.-IIISE) CAN bus diagnostics.
Use scan tool (M.U.T.-IIISE) to perform the CAN bus diagnosis.
Is the check result normal?
Go to Step 2
.
Repair the CAN bus lines (Refer to GROUP 54C - Diagnosis, Can Bus Diagnostics Table
).
STEP 2. Scan tool (M.U.T.-IIISE) other system DTC.
Check the ASC DTC (Refer to GROUP 35C - Diagnosis, Diagnostic Trouble Code Chart
).
Is the DTC set?
Perform the relevant troubleshooting.
Go to Step 3
.
STEP 3. Scan tool (M.U.T.-IIISE) DTC.
Check if AWC DTC C123C, C1242 is set (Refer to
).
Is the DTC set?
Perform the relevant troubleshooting.
Go to Step 4
.
STEP 4. Scan tool (M.U.T.-IIISE) data list.
Check the data list below (Refer to
).
Item No.39: Yaw rate
Item No.40: Lateral G
Item No.41: Longitudinal G
Is the check result normal?
Go to Step 5
.
Replace the hydraulic unit (incorporating G and yaw rate sensor) (Refer to GROUP 35C - Hydraulic Unit
).
STEP 5. Check whether the DTC is set again.
Is the DTC U1428 set?
Replace the AWC-ECU (Refer to
).
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction
).