Pinpoint Test F : DTC U012D, U042E

WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.

Refer to CHARGING SYSTEM for schematic and connector information.

Normal Operation and Fault Conditions

The charging system supplies voltage to the battery and the vehicle electrical system through the battery B+ cable. The PCM monitors the generator output through a LIN communication circuit shared with the automatic grill shutters (AGS). The PCM uses this LIN circuit to communicate the desired voltage setpoint to the generator internal voltage regulator. The generator also uses this to communicate the generator load and error conditions to the PCM.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM U012D:00	Lost Communication With Generator "A" Control Module: No Sub Type Information	Sets if the PCM does not detect communication through the LIN circuit. This can be a result of an open or short in the LIN circuit. This DTC also sets if the generator B+ circuit is open.
PCM U042E:00	Invalid Data Received From Generator "A" Control Module: No Sub Type Information	Sets when the PCM receives invalid data from the generator.

Possible Sources

Active grille shutters
Battery monitoring sensor
Generator
PCM
Wiring, terminals or connectors

Visual Inspection and Pre-checks

Inspect high current BJB for loose, damaged or corroded connections.
Inspect the BJB fuse 5 (275A).
Inspect the FEAD belt.

NOTE: Make sure battery voltage is greater than 12.2 volts prior to and during this pinpoint test.
NOTE: Do not have a battery charger attached during vehicle testing.

F1 CHECK VEHICLE FOR PRESENCE OF GRILLE SHUTTERS
- While looking through the grille opening, inspect the vehicle for the presence of grille shutters. REFER to: Active Grille Shutter - 2.0L Duratec-HE (125kW/170PS) - MI4 .
Is the vehicle equipped with grille shutters?

Yes GO to F2

No GO to F3

F2 RETRIEVE PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS) WITH GRILLE SHUTTER ACTUATOR DISCONNECTED
- Ignition OFF.
- Disconnect Grille Shutter Actuator C1651.
- Ignition ON.
- Using a diagnostic scan tool, perform the PCM self-test.
Is DTC U012D or U042E present?

Yes GO to F3

No INSTALL new grille shutter actuator. REFER to: Active Grille Shutter - 2.0L Duratec-HE (125kW/170PS) - MI4 .

F3 COMPARE THE GENERATOR B+ CIRCUIT TO BATTERY VOLTAGE

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY

For the 1.0L EcoBoost engines, measure:

Positive Lead	Measurement / Action	Negative Lead
C1104A-1	Courtesy of FORD MOTOR COMPANY	Ground

For the 1.5L Duratec engines, measure:

Positive Lead	Measurement / Action	Negative Lead
C102A-1	Courtesy of FORD MOTOR COMPANY	Ground

For the 2.0L Duratec engine, measure:

Positive Lead	Measurement / Action	Negative Lead
C1558A-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage within 0.5 volt of the recorded battery voltage?

Yes

GO to F4

TIGHTEN or INSTALL a new generator B+ nut as needed. For 1.0L EcoBoost, REFER to: Generator - 1.0L EcoBoost (92kW/125PS) . For 2.0L Duratec, REFER to: Generator - 2.0L Duratec-HE (129kW/175PS) . VERIFY high current BJB fuse MEGA 2 (150A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

F4 CHECK THE GENERATOR LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect Generator C1104B (1.0L EcoBoost engines).

Disconnect Generator C102B (1.5L Duratec engines).

Disconnect Generator C1558B (2.0L Duratec engine).

Disconnect PCM C1381B (1.0L EcoBoost engine).

Disconnect PCM C175E (1.5L Duratec engine with manual transmission).

Disconnect PCM C1915B (1.5L Duratec engine with automatic transmission).

Disconnect PCM C1915B (2.0L Duratec engine).

For the 1.0L EcoBoost engines, measure:

Positive Lead	Measurement / Action	Negative Lead
C1104B-1	Courtesy of FORD MOTOR COMPANY	Ground

For the 1.5L Duratec engines, measure:

Positive Lead	Measurement / Action	Negative Lead
C102B-1	Courtesy of FORD MOTOR COMPANY	Ground

For the 2.0L Duratec engine, measure:

Positive Lead	Measurement / Action	Negative Lead
C1558B-1	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to F5

F5 CHECK THE GENERATOR LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

For the 1.0L EcoBoost engines, measure:

Positive Lead	Measurement / Action	Negative Lead
C1104B-1	Courtesy of FORD MOTOR COMPANY	Ground

For the 1.5L Duratec engines, measure:

Positive Lead	Measurement / Action	Negative Lead
C102B-1	Courtesy of FORD MOTOR COMPANY	Ground

For the 2.0L Duratec engine, measure:

Positive Lead	Measurement / Action	Negative Lead
C1558B-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to F6

No	REPAIR the circuit.

F6 CHECK THE GENERATOR LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR AN OPEN

For the 1.0L EcoBoost engine, measure:

Positive Lead	Measurement / Action	Negative Lead
C1104B-1	Courtesy of FORD MOTOR COMPANY	C1381B-50
C1104B-1	Courtesy of FORD MOTOR COMPANY	C1651-2

For the 1.5L Duratec engine with manual transmission, measure:

Positive Lead	Measurement / Action	Negative Lead
C102B-1	Courtesy of FORD MOTOR COMPANY	C175E-37
C102B-1	Courtesy of FORD MOTOR COMPANY	C1651-2

For the 1.5L Duratec engine with automatic transmission, measure:

Positive Lead	Measurement / Action	Negative Lead
C102B-1	Courtesy of FORD MOTOR COMPANY	C1915B-74
C102B-1	Courtesy of FORD MOTOR COMPANY	C1651-2

For the 2.0L Duratec engine, measure:

Positive Lead	Measurement / Action	Negative Lead
C1558B-1	Courtesy of FORD MOTOR COMPANY	C1915B-50
C1558B-1	Courtesy of FORD MOTOR COMPANY	C1651-2

Is the resistance less than 3 ohms?

Yes	INSTALL a new generator . For 1.0L EcoBoost, REFER to: GENERATOR - 1.0L ECOBOOST (92KW/125PS) For 2.0L refer to GENERATOR - 2.0L DURATEC-HE (129KW/175PS)

No	REPAIR the affected circuit.

F7 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all PCM connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect the PCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSB address this concern, Refer to PCM GUIDED ROUTINE TESTING .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.