Pinpoint Test I : Line Pressure Control (LPC) Solenoid A

WARNING: This page is about a different car, the 2015 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

I1 RETRIEVE AND RECORD ALL DTCS

Using the diagnostic scan tool, retrieve all DTCs.

Are DTCs P0748, P0960, P0961, P0962 and/or P0963 present?

Yes	For DTCs P0748 and P0960, GO to I2For DTCs P0748, P0961 and P0962, GO to I5For DTCs P0748 and P0963, GO to I7

No	REFER to: Diagnosis By Symptom .

I2 CHECK THE LINE PRESSURE CONTROL (LPC) SOLENOID A CONTROL CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect Transmission Vehicle Harness C1909 .

Disconnect PCM C1551T .

Inspect the connectors for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1909-3	Courtesy of FORD MOTOR COMPANY	C1551T-34

Is the resistance less than 3 ohms?

Yes

GO to I3

No	REPAIR the circuit.

I3 CHECK THE LINE PRESSURE CONTROL (LPC) SOLENOID A FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
Component side resistance pin 5.	Courtesy of FORD MOTOR COMPANY	Component side resistance pin 3.

Is the resistance between 4.0 and 7.2 ohms?

Yes	INSTALL a new PCM. Refer to: Powertrain Control Module (PCM) . PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download .

GO to I4

I4 CHECK THE LINE PRESSURE CONTROL (LPC) SOLENOID A RESISTANCE

Remove the transmission internal wiring harness frame. Refer to: Transmission Internal Wiring Harness Frame . Inspect for metal shavings on the exposed metal contacts or other components and clean the solenoid and transmission internal wiring harness frame terminals.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Line Pressure Control (LPC) solenoid A, pin A.	Courtesy of FORD MOTOR COMPANY	Line Pressure Control (LPC) solenoid A, pin B.

Is the resistance between 4.0 and 7.2 ohms?

Yes	INSTALL a new transmission internal wiring harness frame. Refer to: Transmission Internal Wiring Harness Frame .

No	INSTALL a new Line Pressure Control (LPC) solenoid A. Refer to: Solenoid .

I5 CHECK THE LINE PRESSURE CONTROL (LPC) SOLENOID A CONTROL CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Disconnect Transmission Vehicle Harness C1909 .

Disconnect PCM C1551T .

Inspect the connectors for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1909-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to I6

No	REPAIR the circuit.

I6 CHECK THE LINE PRESSURE CONTROL (LPC) SOLENOID A FOR A SHORT TO GROUND

Remove the transmission internal wiring harness frame. Refer to: Transmission Internal Wiring Harness Frame . Inspect for metal shavings on the exposed metal contacts or other components and clean the solenoid and transmission internal wiring harness frame terminals.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Line Pressure Control (LPC) solenoid A, pin A.	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes	INSTALL a new Line Pressure Control (LPC) solenoid A. Refer to: Solenoid .

No	INSTALL a new transmission internal wiring harness frame. Refer to: Transmission Internal Wiring Harness Frame .

I7 CHECK THE LINE PRESSURE CONTROL (LPC) SOLENOID A FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect Transmission Vehicle Harness C1909 .

Disconnect PCM C1551T .

Inspect the connectors for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1909-3	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

No	INSTALL a new PCM. Refer to: Powertrain Control Module (PCM) . PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download .