DTC 346

DTC 346 INVERTER COOLING SYSTEM PERFORMANCE

CIRCUIT DESCRIPTION

DTC Detection Condition:

The inverter converts the high-voltage direct current of the HV battery into the alternating current for the MG1 and the MG2. The inverter generates heat during the conversion process, and this heat could damage the inverter if a cooling system is unavailable. Therefore, similar to the MG1 and the MG2, the inverter is cooled by a dedicated cooling system, which consists of an electric water pump, cooling fan, and radiator. This cooling system is independent of the engine cooling system.

The HV control ECU monitors the electric water pump, cooling fan and cooling system, and detects malfunction.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Component Operating Range:

If the HV control ECU detects malfunction in the electric water pump, fan, or radiator, it illuminates the MIL and sets a DTC.

Step 1 - 2:

Step 3 - 6:

Step 7:

INSPECTION PROCEDURE