DTC P0AA1-224 Hybrid Battery Positive Contactor Circuit Stuck Closed; DTC P0AA2-225 Hybrid Battery Positive Contactor Circuit Stuck Open: Description
The SMRs (System Main Relays), installed in the HV relay assembly, connect and disconnect the highvoltage power supply circuit in accordance with requests from the HV control ECU. To ensure a reliable operation, there are three SMRs in total (one for the negative side and two for the positive side).
To connect, SMR1 and SMR3 turn on initially. Then, SMR2 turns on and SMR1 turns off. This process protects the circuit from the high-voltage surge current by allowing the limit current to flow via the resistor. To disconnect, SMR2 and SMR3 turn off in that order. The HV control ECU checks that the relays have turned off properly.
The HV control ECU monitors operation of the SMRs (CON1, CON2, CON3) to check for malfunctions.
DTC DETECTION CONDITION - TROUBLE AREA CHART
| DTC No. | INF Code | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| P0AA1 | 224 | Open or +B short in SMR1 (CON1) circuit |
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| P0AA2 | 225 | Short to GND in the SMR1 (CON1) circuit |
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