Pinpoint Test F: Lin Communication Fault

Refer to CHARGING SYSTEM for schematic and connector information.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM U012D:00	Lost Communication With Generator "A" Control Module: No Sub Type Information	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. The PCM uses this LIN circuit to communicate the desired voltage set point to the generator internal voltage regulator. The generator also uses this to communicate the generator load and error conditions to the PCM. This communication line is shared with the grill shutters
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

Grill shutters
Generator
Wiring shorted to ground or voltage
Alternator B+ wiring open
Wiring, terminals or connectors

Visual Inspection and Pre-checks

Inspect the high current BJB for loose or corroded connections

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 THE BATTERY CONDITION
- Check the battery condition and state of charge. REFER to: Battery .
Does the battery pass the condition test?

Yes GO to F2

No CHARGE or INSTALL a new battery as necessary. REFER to: Battery .

F2 IS DTC U0284 PRESENT
- Ignition ON.
- Enter the following diagnostic mode: Self Test - PCM.
Is DTC U0284 present?

Yes GO to F8

No GO to F3

F3 CHECK FOR VOLTAGE ON THE ALTERNATOR B+

Start the engine.

Increase the engine speed to 2000 rpm and then back to idle.

Measure and record:

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

Did battery voltage rise after engine started?

Yes

GO to F5

GO to F4

F4 CHECK THE ALTERNATOR B+ CONNECTION

Check for voltage at the generator C1104C.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1104C-1	Courtesy of FORD MOTOR COMPANY	Ground

Does C1104C equal to battery voltage?

Yes

GO to F5

No	REPAIR the wiring circuit.

F5 CHECK THE LIN (LOCAL INTERCONNECT NETWORK) LINE FOR SHORT TO OTHER PINS

Ignition OFF.

Disconnect / inspect inline connector C110 for signs of water intrusion, damaged pins or pushed out pins.

Check for resistance to all pins in the male side connector. Repeat process for female side of connector.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C110-12	Courtesy of FORD MOTOR COMPANY	C110-all pins

Is the resistance less than 10, 000 ohms to ground?

Yes	If resistance less than10, 000 ohms on female side. GO to F7 If resistance less than 10, 000 ohms on male side. GO to F10

GO to F6

F6 CHECK THE LIN (LOCAL AREA NETWORK) LINE FOR SHORT TO VOLTAGE

Ignition OFF.

Check for voltage inline connector C110-12 pin to ground.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C110-12	Courtesy of FORD MOTOR COMPANY

Is any voltage present?

Yes	REPAIR the wiring circuit.

GO to F12

F7 CHECK THE LIN (LOCAL AREA NETWORK) LINE FOR SHORT

Disconnect generator C1104B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C110-12	Courtesy of FORD MOTOR COMPANY	C110-all pins

Is the resistance less than 10, 000 ohms?

Yes	REPAIR the LIN wiring circuit.

No	Replace generator. REFER to: Generator - 2.7L EcoBoost (238kW/324PS) .

F8 CHECK THE INLINE CONNECTOR C110 FOR WATER INTRUSION

Ignition OFF.

Inspect connector for signs of water intrusion, damaged pins or pushed out pins.

Check for resistance to all pins in the male side connector. Repeat process for female side of connector.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C110-12	Courtesy of FORD MOTOR COMPANY	C110-all pins

Is the resistance less than 10, 000 ohms to any other pin.

Yes	If resistance less than 10, 000 ohms on female side. GO to F7 If resistance less than 10, 000 ohms on male side. GO to F10

GO to F9

F9 CHECK FOR VOLTAGE ON LIN (LOCAL AREA NETWORK) LINE

Ignition OFF.

Check for voltage to ground on both male and female side of connector.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C110-12	Courtesy of FORD MOTOR COMPANY

Is there any voltage present?

Yes	REPAIR the wiring harness.

GO to F12

F10 DISCONNECT THE INLINE CONNECTOR C134 AND CHECK FOR RESISTANCE

Ignition OFF.

Disconnect inline connector C134.

Check for resistance to all pins in the male side connector.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C110-12	Courtesy of FORD MOTOR COMPANY	C110-all pins

Is the resistance less than 10, 000 ohms to any other pin?

Yes

GO to F11

No	REPAIR the Grill Shutter Actuator.

F11 DISCONNECT GENERATOR LIN CONNECTION AND CHECK FOR RESISTANCE

Disconnect PCM C1551B.

Check for resistance to all pins in the male side connector.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C110-12	Courtesy of FORD MOTOR COMPANY	C110-all pins

Is the resistance less than 10, 000 ohms to any other pin?

Yes	REPAIR the wiring / inline connector C134 or C110

No	REPLACE the Generator. REFER to: Generator - 2.7L EcoBoost (238kW/324PS) .

F12 CHECK PIN FIT FOR CONNECTOR C1551B PIN 49
- Check the PCM pin fit on the connector C1551B-49.
Is the pin ok.

Yes GO to F13

No REPAIR the circuit.

F13 VERIFY LIN LINE RESISTANCE

Connect Inline connector C110.

Disconnect generator C1104B.

Measure resistance between C1104B-1 to C1551B-49

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1104B-1	Courtesy of FORD MOTOR COMPANY	C1551B-49

Is resistance less than 3 ohms?

Yes

GO to F14

No	REPAIR the LIN wiring circuit.

F14 CHECK FOR PCM ABILITY TO CONTROL THE ALTERNATOR
- Connect all connectors back together.
- Connect volt meter to battery.
- Start engine
- Using a diagnostic scan tool active command, set the PCM PID GENVDSD to 14.7 volts.
Is the battery voltage within 14.7+/-0.5 volts?

Yes GO to F15

No REPLACE the Generator. REFER to: Generator - 2.7L EcoBoost (238kW/324PS) .

F15 WIGGLE TEST WIRING

Wiggle wiring and inline connectors C1104B, C110, C134, CS100, C1551B, C1767

Using a diagnostic scan tool active command, set the PCM PID GENVDSD to 12.0 volts.

Does the voltage change or is the DTC U012D or U042E set while wiggling the wires?

Yes	Repair the wiring harness.

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. CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions.