P0AE2

P310 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0AE2-773: Hybrid Battery Precharge Contactor Circuit Stuck Closed

DTC P0AE2-773 - Hybrid Battery Precharge Contactor Circuit Stuck Closed

DESCRIPTION

The SMRs (System Main Relays), installed in the HV relay assembly, connect and disconnect the high-voltage power supply circuit in accordance with requests from the hybrid vehicle control ECU. To ensure reliable operation, there are three SMRs in total (one for the negative side and two for the positive side).





To connect the high-voltage power supply circuit, 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 current to flow via the limiting resistor. To disconnect the high-voltage power supply circuit, SMR2 and SMR3 turn off in that order. The hybrid vehicle control ECU checks that the relays have turned off properly.
The hybrid vehicle control ECU monitors operation of the SMRs (CON1, CON2, CON3) to check for malfunctions.







WIRING DIAGRAM





INSPECTION PROCEDURE
CAUTION:
- Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals. After waiting for 5 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
HINT:
- Waiting for at least 5 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
- If P0AE2-773 is output, the vehicle is prevented from starting.

PROCEDURE

1. CHECK HV RELAY ASSEMBLY
CAUTION: Be sure to wear insulated gloves.
(a) Turn the power switch off.





(b) Remove the service plug grip Removal.
NOTE: After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





HINT:
- If a system main relay is stuck closed, inspect the HV relay assembly without removing it from the vehicle, in order to keep the relay closed.
- If P0AE2-773 is output, the HV relay assembly must be replaced. Measuring resistance can determine if this is either a present or past malfunction.
- If the resistance is between 28.5 and 31.5 Ohms, it can be determined that SMR1 is stuck closed.

NG -- REPLACE HV RELAY ASSEMBLY
OK -- REPLACE HV RELAY ASSEMBLY