DTC    P0AA4-232    Hybrid Battery Negative Contactor Circuit Stuck Closed

for Preparation Click here


DESCRIPTION

Refer to the description for DTC P0AA1-224. (Click here)

DTCNo.
INF Code
DTC Detection Condition
Trouble Area
P0AA4
232
System main relay No.3 on the HV battery negative side stuck closed
HV relay assembly

MONITOR DESCRIPTION

The HV control ECU monitors the system main relay No.3, because shutting off the high-voltage system might be impossible if the relay terminal becomes stuck. If the HV control ECU detects that the relay terminal has become stuck closed, it illuminates the MIL and sets a DTC.

WIRING DIAGRAM

See the wiring diagram of P0AA1-224. (Click here)

INSPECTION PROCEDURE

CAUTION:
  1. Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
  2. After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.

HINT:
At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.

1.CHECK HV RELAY ASSEMBLY

CAUTION:
Be sure to wear insulated gloves.



    A108056E02

  1. Turn the ignition switch off and remove the service plug grip. (Click here)

    NOTICE:
    Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Specified Condition
    S49-1 - S45-1
    		10 kΩ or higher

    HINT:
    1. 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.
    2. If P0AA4-232 is output, the HV relay assembly must be replaced. Measuring resistance can determine that this is either a present or past malfunction.



OK
REPLACE HV RELAY ASSEMBLY
OK

REPLACE HV RELAY ASSEMBLY