Milan FWD L4-2.5L (2010)
Pinpoint Test B: DTC P0A94:4B
Refer to Wiring Diagram Set 12 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Charging System for schematic and connector information. See:
Diagrams/Electrical Diagrams/Diagrams By Number
Normal Operation
The DC to DC Converter Control Module (DC/DC) provides power for the low-voltage vehicle systems and charging of the 12-volt battery. The DC/DC
can receive a High Speed Controller Area Network (HS-CAN) message from the PCM indicating that the Motor Electronics Cooling System (MECS)
temperature exceeds 80°C (176°F). Because of this, the DC/DC may limit current output to 100 amps (maximum output is normally greater than 100
amps). When either condition is present, DTC P0A94:4B sets and the DC/DC will continue limiting current until the over-temperature condition clears.
Periodic or constant heavy electrical loads of the 12-volt system may cause the 12-volt battery to become drained. Reduced functionality of 12-volt
systems (headlamps, HVAC blower motor, etc.) may also be noticed.
-
DTC P0A94:4B (DC/DC Performance: Over Temperature) - Sets when the MECS temperature exceeds 80°C (176°F) and/or the DC/DC is
limiting current output to 100 amps.
This pinpoint test is intended to diagnose the following:
-
MECS
-
DC/DC
PINPOINT TEST B: DTC P0A94:4B
-------------------------------------------------
B1 CARRY OUT SELF-TEST OF THE PCM
-
Connect the scan tool.
-
Ignition ON.
-
Enter the following diagnostic mode on the scan tool: Self Test - PCM.
-
Is PCM DTC P0A7C:00 reported?
Yes
REFER to Transmission Cooler, A/T to inspect and diagnose the MECS cooling loop circuit. CLEAR the DTC.
REPEAT the self-test. TEST the system for normal operation.
No
GO to B2.
