DTC U0320:00/U0420:00/U0420:64 [DYNAMIC STABILITY CONTROL (DSC)]

id0402b2860700

DTC
U0320:00, U0420:00, U0420:64, U0428:62
Abnormal message from EPS CM
DETECTION CONDITION
•  U0320:00, U0420:00
―  The steering angle sensor detects signal modulation or steering angle that exceeds specification.
•  U0420:64
―  The signal from the steering angle sensor remains unchanged when the steering angle is turned to the right and left.
•  U0428:62
―  While driving at a vehicle speed of 20 km/h {12 mph} or more, the steering angle neutral position is not fixed for longer than 2 minutes.
FAIL-SAFE FUNCTION
•  Illuminates the TCS/DSC indicator light and master warning light*1.
•  Inhibits the TCS, DSC, Mazda Radar Cruise Control (MRCC)*2, and Smart City Brake Support (SCBS)*2 controls.
*1: Vehicles with Smart City Brake Support (SCBS).
*2: If equipped.
POSSIBLE CAUSE
•  EPS CM malfunction
SYSTEM WIRING DIAGRAM
Not applicable

Diagnostic procedure

STEP

INSPECTION

ACTION
1
PERFORM EPS CM DTC INSPECTION
•  Switch the ignition off.
•  Using the M-MDS, perform the DTC inspection for the EPS CM.
•  Are any DTCs detected?
Yes
Go to applicable DTC inspection.
(See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS.)
No
Go to the next step.
2
VERIFY THAT SAME DTC IS NOT PRESENT
•  Clear the DTCs from the memory.
•  Are the same DTCs present?
Yes
Repeat the inspection from Step 1.
If the malfunction recurs, replace the EPS CM, then go to the next step.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
No
Go to the next step.
3
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Are any other DTCs output?
Yes
Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
No
DTC troubleshooting completed.