Pinpoint Test F: DTC P0AFB:17
High-Voltage Converter/Inverter
Pinpoint Test F: DTC P0AFB:17
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) monitors the high voltage available from the High Voltage Traction Battery (HVTB). If the DC/DC senses high voltage of greater than 360 volts, it will set DTC P0AFB:17 and request the CHECK CHARGING SYSTEM message be displayed in the message center. The DC/DC will be in standby mode (DC/DC disabled) until the high voltage condition clears, resulting in 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 P0AFB:17 (Hybrid Battery System Voltage High: Circuit Voltage Above Threshold) - Sets when the DC/DC senses HVTB voltage of greater than 360 volts.
This pinpoint test is intended to diagnose the following:
- HVTB system fault
- High-voltage cables
PINPOINT TEST F: DTC P0AFB:17
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F1 CHECK THE TCM AND AIR CONDITIONING COMPRESSOR MODULE FOR HIGH VOLTAGE OVER-VOLTAGE DTCs
- Ignition ON.
- Connect the scan tool.
- Enter the following diagnostic mode on the scan tool: Self Test - TCM, and record the results.
- Enter the following diagnostic mode on the scan tool: Self Test - ACCM.
- Is Transmission Control Module (TCM) DTC P0A78:17, P0A7A:17, P1A07:16, P0A07:62 and/or Air Conditioning Compressor Module (ACCM) DTC P0AFB:17 present?
Yes
GO to F2.
No
DEPOWER the HVTB. REFER to High Voltage Traction Battery High-Voltage Traction Battery Systems Depowering. INSPECT the high-voltage cable ends for arcing or terminal pull out. REPAIR as necessary. CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.
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F2 CHECK HIGH VOLTAGE TO THE DC/DC USING PID HEV HIGH VOLTAGE BUS-MEASURED (HEVHiVolt)
- Enter the following diagnostic mode on the scan tool: DataLogger - DC/DC.
- Monitor the DC/DC PID HEVHiVolt.
- Does the PID read less than 360 volts?
Yes
CARRY OUT self-test of the Battery Energy Control Module (BECM). REFER to High Voltage Traction Battery Testing and Inspection for further diagnosis of the BECM DTCs. CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.
No
DEPOWER the HVTB. REFER to High Voltage Traction Battery High-Voltage Traction Battery Systems Depowering. INSPECT the high-voltage cable ends for arcing or terminal pull out. REPAIR as necessary. CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.
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