DTC U0121:00 [TCM (ET6A-EL, ET6AX-EL) (E)]
id0502q99084r2
Outline
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System malfunction location |
Communication error to DSC HU/CM (without Mazda M Hybrid)/electronically controlled brake unit (with Mazda M Hybrid) |
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Detection condition
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• Under the following condition, the TCM cannot receive the signal from DSC HU/CM (without Mazda M Hybrid)/electronically controlled brake unit (with Mazda M Hybrid):
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Fail-safe
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• Inhibits learning control.
• Inhibits neutral idle control.
• Inhibits i-stop control.
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Possible cause
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• CAN communication line malfunction between TCM and DSC HU/CM (without Mazda M Hybrid)/electronically controlled brake unit (with Mazda M Hybrid)
• TCM malfunction
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System wiring diagram
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• Not applicable
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Connector diagram
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• Not applicable
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Diagnostic Procedure