DTC    P3222-313    Generator Inverter Temperature Sensor Circuit High / Low

DTC    P3223-312    Generator Inverter Temperature Sensor Circuit High

for Preparation Click here


DESCRIPTION

The MG ECU located in the w/ converter inverter assembly uses the temperature sensor that is built into the w/ converter inverter assembly to detect the generator inverter temperature. The inverter cooling system is the same as that for the Motor or Generator, and operates independently of the engine cooling system. The characteristics of the generator inverter temperature sensor are the same as those of the boost converter temperature sensor. The MG ECU limits the load based on signals sent from the generator inverter temperature sensor in order to check the effect of the inverter cooling system and prevent overheating. Furthermore, the ECU detects malfunctions in the wiring of the generator inverter temperature sensor, as well as in the sensor.

DTC No.
INF Code
DTC Detection Condition
Trouble Area
P3222
313
Open or GND short in generator inverter temperature sensor circuit
  1. w/ converter inverter assembly (MG ECU)
P3223
312
+B short in generator inverter temperature sensor circuit
  1. w/ converter inverter assembly (MG ECU)

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 CONNECTION CONDITION OF MG ECU CONNECTOR (LOOSENESS AND POOR CONTACT)

CAUTION:
Be sure to wear insulated gloves.

  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. Remove the inverter cover. (Click here)

    NOTICE:
    1. Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
    2. Be sure to prevent water in the reservoir tank from entering the inverter.
    3. Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.



    A103665E01

  1. Check the connections of the w/ converter inverter assembly connectors.

    OK:
    Connectors are connected securely and there is no poor connection.



NG
CONNECT SECURELY
OK

REPLACE W/ CONVERTER INVERTER ASSEMBLY