Pinpoint Test AG: DTC U3003:62

High-Voltage Traction Battery

Pinpoint Test AG: DTC U3003:62

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

During normal vehicle operation the 12-volt battery supplies voltage to the Battery Energy Control Module (BECM) in order for the BECM to operate. The BECM compares the voltage of the DC to DC Converter Control Module (DC/DC) which is communicated via the High Speed Controller Area Network (HS-CAN).

- U3003:62 (Battery Voltage: Signal Compare Failure) - Fault sets when the BECM does a compare with the DC to DC Converter Control Module (DC/DC) and the input voltages to both modules do not match.

This pinpoint test is intended to diagnose the following:

- DC/DC
- BECM


PINPOINT TEST AG: DTCs U3003:62

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AG1 RETRIEVE BECM DTCs

- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - BECM.
- Are any DTCs other than U3003:62 retrieved?

Yes
REFER to the Battery Energy Control Module (BECM) DTC Chart and diagnose all other DTCs first. Battery Energy Control Module (BECM) DTC Chart

No
GO to AG2.

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AG2 RETRIEVE DC/DC DTCs

- Enter the following diagnostic mode on the scan tool: Self Test - DC/DC.
- Are any DTCs retrieved?

Yes
REFER to High Voltage Converter/Inverter Testing and Inspection to diagnose DC/DC DTCs.

No
GO to AG3.

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AG3 CHECK FOR CORRECT BECM OPERATION

- Ignition OFF.
- Check the BECM harness and component side connectors for:

- corrosion.
- pushed-out/bent pins.
- Connect the BECM and make sure the connectors seat correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?

Yes
INSTALL a new BECM. REFER to Battery Energy Control Module (BECM) Service and Repair. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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