DTC P1A57
DTC P1A57: Traction Motor Phase Current Sensor
General Description
The power control unit (PCU) controls the motor output based on the motor phase current sensor signals. If the difference in amplitude of the 3-phase current sensor output is the threshold or more for a specified time, the motor control module in the PCU detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 340 milliseconds or more |
| DTC Type | One drive cycle, MIL on, POWER SYSTEM indicator on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Traction motor speed | 500 rpm | - |
| 12 volt battery voltage | 8 V | - |
Malfunction Threshold
If all of the differences in amplitude of phase current from the current sensor is more than 141.6 A for at least 340 milliseconds.
Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- PCU internal failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the motor control module memory.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.