DTC U0402:00 [DYNAMIC STABILITY CONTROL (DSC)]
id0402b2881800
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DTC
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U0402:00
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Abnormal message from transmission/transaxle
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DETECTION CONDITION
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• The DSC HU/CM received error signals from the transmission/transaxle for 1 s or more with the ignition switched ON (engine off or on).
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FAIL-SAFE FUNCTION
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• Illuminates the TCS/DSC indicator light and master warning light*1.
• Inhibits the TCS, Hill Launch Assist (HLA), vehicle roll prevention function*2, DSC, Mazda Radar Cruise Control (MRCC)*2, Smart Brake Support (SBS)*2, Smart City Brake Support (SCBS)*2, and Secondary Collision Reduction (SCR)*2 controls.
*1: Vehicles with Smart City Brake Support (SCBS), Mazda Radar Cruise Control (MRCC) and/or Smart Brake Support (SBS).
*2: If equipped.
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POSSIBLE CAUSE
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• The transmission/transaxle could not send a normal signal temporarily. (DTCs are stored in the TCM.)
• transmission/transaxle malfunction
• TCM malfunction
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SYSTEM WIRING DIAGRAM
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Not applicable
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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PERFORM TCM DTC INSPECTION
• Switch the ignition to off.
• Verify DTCs for the TCM using the M-MDS.
• Is the DTC displayed?
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Yes
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Repair the malfunctioning part according to the applicable DTC troubleshooting.
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No
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Go to the next step.
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2
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VERIFY THAT THE SAME DTC IS NOT PRESENT
• Clear DTC for the DSC HU/CM using the M-MDS.
• Are the same DTCs present?
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Yes
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Repeat the inspection from Step 1.
If the malfunction recurs, replace the TCM, then go to the next step.
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No
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Go to the next step.
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3
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VERIFY IF OTHER DTCs DISPLAYED
• Are any other DTCs displayed?
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Yes
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Repair the malfunctioning part according to the applicable DTC troubleshooting.
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No
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DTC troubleshooting completed.
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