PCS_a089 — Hv Bus Discharge Irrational
Full alert identifier: PCS_a089_hvBusDischargeIrrational
Alert description
The Power Conversion System (PCS) electronic control unit (ECU) detects its DCDC converter is unable to regulate the voltage slew rate while the high voltage (HV) bus is discharging, causing the HV bus to discharge outside of the specified slew rate threshold.
Potential impact
Vehicle will be unable to precharge. Guobiao direct current (GB DC) and CHAdeMO DC fast charging (FC) may not start or may be interrupted due to CHAdeMO and GB DC compatibility conditions.
Set condition
The PCS ECU detects the DCDC converter is unable to regulate the voltage slew rate while the HV bus is discharging.
Clear condition
The PCS ECU detects the DCDC converter is able to regulate the voltage slew rate while the HV bus is discharging.
Signals to check
Open this alert in Service Mode Plus and review the Payload tab. Use the field names below to identify the values shown by your vehicle.
| Signal | Unit |
|---|---|
Freq
PCS_
|
kHz |
G
PCS_
|
— |
HV Bus V
PCS_
|
V |
Phase Shift
PCS_
|
— |
Avg Slew Rate
PCS_
|
V/sec |
Hv Slew Rate
PCS_
|
V/sec |
| Signal | Unit |
|---|---|
Fast Discharge Mode
PCS_
|
— |
Slow Discharge Mode
PCS_
|
— |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of PCS_a089.