Home

Mazdamanuals.com

DTC U0100:00 [INTEGRATED STARTER GENERATOR (ISG)]

id140202301900

Outline

System malfunction location

Communication error with PCM

Detection condition

•  The integrated starter generator (ISG) cannot receive CAN signal from the PCM for 1 s or more.

Precondition

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

•  The initialization for the stator coil drive circuit in the integrated starter generator (ISG) is completed.

•  The voltage at terminal 1A is 10 V or more for a continuous 1.5 s.

Fail-safe

•  Stops power supply from the Mazda M Hybrid battery and supplies power to the vehicle’s electrical devices (12 V power supply) from the 12 V battery.(If the vehicle continues to be driven while the DTC is detected, the 12 V battery will be depleted and the vehicle can no longer be driven.)

•  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

•  Integrated starter generator (ISG) connector or terminals malfunction

•  Short to ground in integrated starter generator (ISG) CAN_H communication line

•  Short to power supply in integrated starter generator (ISG) CAN_L communication line

•  Open circuit in any of the following integrated starter generator (ISG) circuits.

―  CAN_H communication line

―  CAN_L communication line

•  Malfunction in CAN communication line between PCM and integrated starter generator (ISG)

•  Integrated starter generator (ISG) malfunction

System malfunction location	Communication error with PCM
Detection condition	• The integrated starter generator (ISG) cannot receive CAN signal from the PCM for 1 s or more. Precondition • 1.5 s have elapsed after the ignition was switched ON (engine off or on) • The initialization for the stator coil drive circuit in the integrated starter generator (ISG) is completed. • The voltage at terminal 1A is 10 V or more for a continuous 1.5 s.
Fail-safe	• Stops power supply from the Mazda M Hybrid battery and supplies power to the vehicle’s electrical devices (12 V power supply) from the 12 V battery.(If the vehicle continues to be driven while the DTC is detected, the 12 V battery will be depleted and the vehicle can no longer be driven.) • 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	• Integrated starter generator (ISG) connector or terminals malfunction • Short to ground in integrated starter generator (ISG) CAN_H communication line • Short to power supply in integrated starter generator (ISG) CAN_L communication line • Open circuit in any of the following integrated starter generator (ISG) circuits. ― CAN_H communication line ― CAN_L communication line • Malfunction in CAN communication line between PCM and integrated starter generator (ISG) • Integrated starter generator (ISG) malfunction

Diagnostic Procedure

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