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DTC U0073:00 [DC-DC CONVERTER (Mazda M Hybrid)]

id140206301800

Outline

System malfunction location

Module communication error (CAN BUS No.1)

Detection condition

•  The DC-DC converter (Mazda M Hybrid) detects a CAN BUS communication line (CAN BUS No.1) malfunction.

Precondition

•  1.5 s have elapsed after the ignition was switched ON (engine off or on)

•  Voltage at DC-DC converter (Mazda M Hybrid) terminal 1A is 9-16 V for a continuous 1 s

Fail-safe

•  The integrated starter generator (ISG) only generates power required for power supply to the 12 V system.

•  Inhibits the i-stop control.

•  Inhibits the non-power generation control.

•  Inhibits regenerative braking by the integrated starter generator (ISG).

•  Inhibits motor assist control by the integrated starter generator (ISG).

Possible cause

•  DC-DC converter (Mazda M Hybrid) connector or terminals malfunction

•  Short to ground in DC-DC converter (Mazda M Hybrid) CAN_H communication line

•  Short to power supply in DC-DC converter (Mazda M Hybrid) CAN_L communication line

•  Open circuit in any of the following DC-DC converter (Mazda M Hybrid) circuits.

―  CAN_H communication line

―  CAN_L communication line

•  Malfunction in CAN communication line between PCM and DC-DC converter (Mazda M Hybrid)

•  DC-DC converter (Mazda M Hybrid) malfunction

System wiring diagram

•  Not applicable

Connector diagram

•  Not applicable

System malfunction location	Module communication error (CAN BUS No.1)
Detection condition	• The DC-DC converter (Mazda M Hybrid) detects a CAN BUS communication line (CAN BUS No.1) malfunction. Precondition • 1.5 s have elapsed after the ignition was switched ON (engine off or on) • Voltage at DC-DC converter (Mazda M Hybrid) terminal 1A is 9-16 V for a continuous 1 s
Fail-safe	• The integrated starter generator (ISG) only generates power required for power supply to the 12 V system. • Inhibits the i-stop control. • Inhibits the non-power generation control. • Inhibits regenerative braking by the integrated starter generator (ISG). • Inhibits motor assist control by the integrated starter generator (ISG).
Possible cause	• DC-DC converter (Mazda M Hybrid) connector or terminals malfunction • Short to ground in DC-DC converter (Mazda M Hybrid) CAN_H communication line • Short to power supply in DC-DC converter (Mazda M Hybrid) CAN_L communication line • Open circuit in any of the following DC-DC converter (Mazda M Hybrid) circuits. ― CAN_H communication line ― CAN_L communication line • Malfunction in CAN communication line between PCM and DC-DC converter (Mazda M Hybrid) • DC-DC converter (Mazda M Hybrid) malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

Diagnostic Procedure

• Perform an inspection in accordance with the multiplex communication system diagnostic procedure. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)