P3222

P310 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P3222-313: Generator Inverter Temperature Sensor Circuit High / Low

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

DTC P3223-312 - Generator Inverter Temperature Sensor Circuit High

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.





INSPECTION PROCEDURE
CAUTION:
- 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.
- 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.

PROCEDURE

1. CHECK CONNECTION CONDITION OF MG ECU CONNECTOR (LOOSENESS AND POOR CONTACT)
CAUTION: Be sure to wear insulated gloves.
(a) Turn the ignition switch off and remove the service plug grip. Hybrid Control System

NOTE: Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.
(b) Remove the inverter cover. Components

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





(c) 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