DTC U0428:62 [DYNAMIC STABILITY CONTROL (DSC)]

id0402b2862300

DTC

U0428:62

DSC HU/CM cannot determine the steering angle neutral position

DETECTION CONDITION

•  While the vehicle is driven at 20 km/h or faster, the DSC HU/CM cannot determine the steering angle neutral position for 2 min or more.

Note

•  Each time the ignition is switched ON, the DSC HU/CM calculates the steering angle neutral position based on the signals from each sensor and each module.

•  If the vehicle is driven as follows just after the engine is started, DTC U0428:62 may be output.

―  Vehicle is accelerated rapidly while being steered right or left

―  Vehicle is driven on abnormal road surface such as banked road

―  Vehicle is driven on continuously curved road such as mountain road

•  If the DTC is a past malfunction during DTC inspection, it does not indicate a vehicle malfunction.

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.

Note

•  If the DSC HU/CM determines the steering angle neutral position after DTC U0428:62 is detected, the TCS/DSC indicator light and master warning light^*1 are turned off.

*¹: Vehicles with Smart City Brake Support (SCBS).

*²: If equipped.

POSSIBLE CAUSE

•  Vehicle is driven just after engine is started (in this case, vehicle is not malfunctioning)

―  Vehicle is accelerated rapidly while being steered right or left

―  Vehicle is driven on abnormal road surface such as banked road

―  Vehicle is driven on continuously curved road such as mountain road

•  Each sensor, module signal error caused by rough-road driving

•  Poor connection at connectors (female terminal)

SYSTEM WIRING DIAGRAM

Not applicable

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY WHETHER MALFUNCTION IS PAST OR PRESENT • Switch the ignition ON (engine off or on). • Are the TCS/DSC indicator light and the master warning light^*1 illuminated?	Yes	Perform DTC inspection and go to the applicable DTC troubleshooting procedure. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) After completing the applicable DTC troubleshooting, go to the next step.
1		No	Clear the DTC from the memory and go to the next step. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
2	VERIFY THAT NO OTHER DTCs ARE PRESENT • Are any other DTCs output?	Yes	Go to the applicable DTC troubleshooting procedure. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
2		No	DTC troubleshooting completed.

* :Vehicles with Smart City Brake Support (SCBS).

DTC	U0428:62		DSC HU/CM cannot determine the steering angle neutral position
DETECTION CONDITION		• While the vehicle is driven at 20 km/h or faster, the DSC HU/CM cannot determine the steering angle neutral position for 2 min or more. Note • Each time the ignition is switched ON, the DSC HU/CM calculates the steering angle neutral position based on the signals from each sensor and each module. • If the vehicle is driven as follows just after the engine is started, DTC U0428:62 may be output. ― Vehicle is accelerated rapidly while being steered right or left ― Vehicle is driven on abnormal road surface such as banked road ― Vehicle is driven on continuously curved road such as mountain road • If the DTC is a past malfunction during DTC inspection, it does not indicate a vehicle malfunction.
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. Note • If the DSC HU/CM determines the steering angle neutral position after DTC U0428:62 is detected, the TCS/DSC indicator light and master warning light^1 are turned off. ¹: Vehicles with Smart City Brake Support (SCBS). ²: If equipped.
POSSIBLE CAUSE		• Vehicle is driven just after engine is started (in this case, vehicle is not malfunctioning) ― Vehicle is accelerated rapidly while being steered right or left ― Vehicle is driven on abnormal road surface such as banked road ― Vehicle is driven on continuously curved road such as mountain road • Each sensor, module signal error caused by rough-road driving • Poor connection at connectors (female terminal)
SYSTEM WIRING DIAGRAM		Not applicable