DTC U0074-00: Communication Error With TCM (At-Bus) (PYUL)

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U0074: 00 (PCM (PYUL)) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Communication error with TCM (AT-bus)
Detection condition	The PCM could not receive a CAN signal from the TCM.
Fail-safe	Inhibits engine-stop by i-stop control.
Possible cause	DTCs are stored in the following modules. TCM (See DTC TABLE [TCM (NJ8A (X)-EC/NN8A (X)-EC/MM8A (X)-EC)] .) PCM (other than U0074: 00) (See DTC TABLE [PCM (PYUL)] .) Malfunction in wiring harness (including connector/terminal) between TCM and PCM (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) TCM malfunction (Refer to [CONTROL VALVE BODY REMOVAL/INSTALLATION ] ). PCM malfunction (Refer to [PCM REMOVAL/INSTALLATION ] ).
Repeatability verification procedure	Clear the DTC recorded in the memory. (See CLEARING DTC .) Start the engine.
Courtesy of MAZDA MOTORS CORP.
1	PCM
2	TCM