DTC P1A89
DTC P1A89: VCU V1 Voltage Sensor Circuit Range/Performance (Over Voltage Range)
General Description
The power control unit (PCU) controls the voltage control unit (VCU) output based on the V1 voltage sensor signals. If the signal voltage from the V1 voltage sensor exceeds a set value 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 | 1.0 second or more |
| DTC Type | One drive cycle, MIL on, POWER SYSTEM indicator on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| High voltage side power supply voltage (6 V) | 5 V | - |
Malfunction Threshold
The V1 voltage sensor output voltage is more than 340 V for at least 1.0 second.
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.