Pinpoint Test C: DTC P0AF7:00

High-Voltage Converter/Inverter

Pinpoint Test C: DTC P0AF7:00

Refer to Wiring Diagram Set 12 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Charging System for schematic and connector information. 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 monitors its temperature internally. If the internal temperature becomes excessive, DTC P0AF7:00 sets and the DC/DC will be in standby mode (DC/DC 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 senses high internal temperature.

This pinpoint test is intended to diagnose the following:

- MECS
- DC/DC


PINPOINT TEST C: DTC P0AF7:00

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C1 CHECK FOR DC/DC DTC P0A94:4B

- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - DC/DC.
- Is DTC P0A94:4B reported?

Yes
REFER to Transaxle/Transmission Cooling - Hybrid Testing and Inspection to inspect and diagnose the MECS cooling loop circuit.

No
GO to C2.

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C2 CLEAR DTCs AND CARRY OUT SELF-TEST OF THE DC/DC

- Using the scan tool, clear the DC/DC DTCs.
- Enter the following diagnostic mode on the scan tool: Self Test - DC/DC.
- Is DTC P0AF7:00 reported?

Yes
INSTALL a new DC/DC. 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.

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