DTC P0AA3
DTC P0AA3: HV Battery Sub Contactor Circuit
General Description
In electric powertrain system, if the vehicle condition is turned to the OFF (LOCK) mode when the vehicle is in a stationary condition, or when electric powertrain system is stopped due to a fail safe action, the high voltage sub contactor turns OFF which was ON during the electric powertrain system was activated. Under an ON malfunction condition of the high voltage sub contactor, the power drive unit (PDU) capacitor is gradually charged by the battery pack, and the inverter voltage rises if the battery condition monitor module sends an ON command of the bypass contactor. The battery condition monitor module monitors the voltage value through the inverter voltage sensor. If the voltage difference of the inverter voltage before and after turning the bypass contactor ON continues to be at a specified value for a certain period of time, the battery condition monitor module detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | After the vehicle condition is turned to the OFF (LOCK) mode |
| Sequence | None |
| Duration | 380 milliseconds or more |
| DTC Type | One drive cycle, MIL off, POWER SYSTEM indicator on, 12 VOLT CHARGING SYSTEM indicator off |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Elapsed time after the bypass contactor is ON | 280 milliseconds | - |
[ ]: HDS Parameter
| Condition | Minimum | Maximum |
|---|---|---|
| Bypass contactor power-supply voltage | 8.7 V | - |
| Traction motor speed | - | 441 rpm |
| Generator motor speed [Motor Speed (GEN)] | - | 740 rpm |
| Vehicle | OFF (LOCK) mode | |
[ ]: HDS Parameter
Malfunction Threshold
The voltage difference between the MPI module voltage before and after turning the bypass contactor ON is more than 48 V and continues for 100 milliseconds or more.
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.
- High voltage sub contactor CNTN line short
- High voltage sub contactor stuck on
- Battery condition monitor module internal circuit failure
Confirmation Procedure
Operating Condition
- Turn the vehicle to the ON mode.
- Turn the vehicle to the OFF (LOCK) mode, and wait 120 seconds.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, a Pending DTC, a Confirmed DTC, and the freeze data are stored in the battery condition monitor module memory. The MIL does not come on.
Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool clear command or the battery condition monitor module reset.