DTC U04C0-00: Backup Power Supply Unit System: Internal Malfunction (PYUL)
WARNING: This page is about a different variant/trim than selected.
U04C0: 00 (PCM (PYUL)) DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
Backup power supply unit system: Internal malfunction |
| Detection condition |
- The following conditions are met:
- The backup power supply unit detects an internal malfunction.
- The PCM normally receives malfunction information from the backup power supply unit.
Precondition
- Switch the ignition ON (engine off or on)
|
| Fail-safe |
- Inhibits auto door lock operation. (with auto door lock system)
- Displays/turns on shift system warning indication/warning light.
- Inhibits engine-stop by i-stop control.
|
| Possible cause |
- Backup power supply unit malfunction (Refer to [BACKUP POWER SUPPLY UNIT REMOVAL/INSTALLATION
]
).
- PCM malfunction (Refer to [PCM REMOVAL/INSTALLATION
]
).
|
| Repeatability verification procedure |
- Clear the DTC recorded in the memory. (See CLEARING DTC
.)
- Replicate the vehicle conditions at the time the DTC was detected using the following procedure.
WARNING:
- Observe legal speed limits when driving the vehicle and perform the procedure in a location where safety can be assured.
- To prevent an accident, work with two people when the vehicle is being driven (one person drives vehicle, other person operates M-MDS).
- Try to reproduce the malfunction by driving the vehicle based on the values in the freeze frame data/snapshot data.
|
| System Wiring Diagram |
|