Pinpoint Test C: DTC P0AF7:00

High-Voltage Converter/Inverter

Pinpoint Test C: DTC P0AF7:00

Refer to Wiring Diagram Set 12, Charging System for schematic and connector information. [1][2]Diagrams By Number

Normal Operation

The DC to DC Converter Control Module (DC/DC) is cooled by the Motor Electronics Cooling System (MECS). The DC/DC (DC to DC Converter Control Module) monitors its temperature internally. If the internal temperature becomes excessive, DTC P0AF7:00 sets and the DC/DC (DC to DC Converter Control Module) will be in standby mode (DC/DC (DC to DC Converter Control Module) disabled) until the over-temperature condition clears. Presence of this DTC will result in CHECK CHARGING SYSTEM being displayed in the message center and the 12-volt battery eventually becoming drained. Reduced or no functionality of 12-volt systems (headlamps, HVAC blower motor, etc.) may also be noticed.

- DTC P0AF7:00 14 (Volt Power Module Internal Temperature Too High: No Sub Type Information)- Sets when the DC/DC (DC to DC Converter Control Module) senses high internal temperature.

This pinpoint test is intended to diagnose the following:

- MECS (Motor Electronics Cooling System)

- DC/DC (DC to DC Converter Control Module)

PINPOINT TEST C : DTC P0AF7:00

C1 CHECK FOR DC/DC (DC to DC Converter Control Module) DTC P0A94:4B

- Connect the scan tool.

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Self Test- DC/DC (DC to DC Converter Control Module).

Is DTC P0A94:4B reported?

Yes
REFER to Transmission Cooler, A/T to inspect and diagnose the MECS (Motor Electronics Cooling System) cooling loop circuit.

No
GO to C2.

C2 CLEAR DTCs AND CARRY OUT SELF-TEST OF THE DC/DC (DC to DC Converter Control Module)

- Using the scan tool, clear the DC/DC (DC to DC Converter Control Module) DTCs.

- Enter the following diagnostic mode on the scan tool: Self Test- DC/DC (DC to DC Converter Control Module).

Is DTC P0AF7:00 reported?

Yes
INSTALL a new DC/DC (DC to DC Converter Control Module). CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.

No
Concern is not present at this time. REPEAT the self-test. TEST the system for normal operation.