Pinpoint Test 3: The DC/DC Converter Does Not Operate Correctly

-
PINPOINT TEST 3: THE DC/DC CONVERTER DOES NOT OPERATE CORRECTLY - HYBRID

Normal Operation

The DC/DC converter is a liquid-cooled component that converts high voltage (216-397 volts) DC power to low voltage (12 volts) DC power while maintaining electrical isolation between the 2 DC power systems. The converter steps down the high voltage to 12 volts, providing power to the vehicle low voltage battery system. The powertrain control module (PCM) controls the operation of the DC/DC converter through an enable input from the PCM to the DC/DC converter.

Possible Causes
- PCM
- 12-volt battery
- Battery cables
- DC/DC converter

Diagnostic Procedure

WARNING:Wear high-voltage insulated safety gloves and a face shield when working with high-voltage batteries or cables. The high-voltage insulated safety gloves should be of the appropriate safety and protection rating. Inspect the gloves before use and always wear them with the leather outer glove. Any hole in the rubber insulating glove is a potential entry point for high-voltage. Failure to follow these instructions may result in serious personal injury or death.

WARNING:Turn OFF the ignition switch for a minimum of 5 minutes before removing high-voltage cables. High-voltage cables and wiring are orange in color. The nominal high-voltage traction battery voltage (HVTB) is 330 V DC. Failure to follow these instructions may result in serious personal injury or death.

WARNING:Depower the high-voltage traction battery (HVTB) before carrying out any removal or installation procedures affecting the high-voltage battery system. Failure to follow this instruction may result in serious personal injury or death.

WARNING:When servicing the high-voltage system, establish a buffer zone per the specified procedure. Failure to follow this instruction may result in serious personal injury or death.

Step 1-Step 6:

Step 7: