Pinpoint Test L : TCC, LPC Solenoids

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

L1 CHECK THE SOLENOID POWER CIRCUIT TSPC2 FOR VOLTAGE

Is the maximum recorded voltage greater than 11 volts?

Yes

GO to L4

GO to L2

Ignition OFF.

Disconnect: Transmission Harness C168 .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C168-11	Courtesy of FORD MOTOR COMPANY	Ground

L2 CHECK THE SOLENOID POWER CIRCUIT FOR AN OPEN

Is the resistance less than 3 ohms?

Yes

GO to L3

REPAIR the transmission vehicle harness circuit for an open. CLEAR the DTCs. If DTC P0657 returns, INSTALL a new TCM. REFER to: Transmission Control Module (TCM) . PROGRAM the TCM with the latest calibration level. PERFORM the Solenoid Body Strategy Data Download procedure. REFER to: Transmission Strategy Download .

Ignition OFF.

Disconnect: TCM C1822 .

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

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1822-24	Courtesy of FORD MOTOR COMPANY	C168-11

L3 CHECK THE SOLENOID POWER CIRCUIT FOR SHORT TO GROUND

Is the resistance greater than 10, 000 ohms?

Yes

GO to L4

No	REPAIR transmission vehicle harness circuit short to ground.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1822-24	Courtesy of FORD MOTOR COMPANY	Ground

L4 CHECK VEHICLE HARNESS SOLENOID CONTROL CIRCUITS FOR AN OPEN

Is the resistance less than 3 ohms on the suspect circuit?

Yes

GO to L5

No	REPAIR the transmission vehicle harness circuit. CLEAR the DTCs.

Ignition OFF.

Disconnect: TCM C1822

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

Measure the resistance of the solenoid control circuits using the following chart.

Positive Lead	Measurement / Action	Negative Lead
C1822-15	Courtesy of FORD MOTOR COMPANY	C168-24
C1822-2	Courtesy of FORD MOTOR COMPANY	C168-25

L5 CHECK VEHICLE HARNESS SOLENOID CONTROL CIRCUITS FOR A SHORT TO GROUND

Is the resistance greater than 10, 000 ohms on the suspect circuit?

Yes

GO to L6

No	REPAIR the transmission vehicle harness circuit. CLEAR the DTCs.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1822-15	Courtesy of FORD MOTOR COMPANY	Ground
C1822-2	Courtesy of FORD MOTOR COMPANY	Ground

L6 CHECK SOLENOID CONTROL CIRCUITS FOR A SHORT TO POWER

Is the resistance on the suspect circuit greater than 10, 000 ohms?

Yes

GO to L7

No	REPAIR the transmission vehicle harness circuit.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1822-15	Courtesy of FORD MOTOR COMPANY	C1822-17
C1822-15	Courtesy of FORD MOTOR COMPANY	C1822-18
C1822-15	Courtesy of FORD MOTOR COMPANY	C1822-24
C1822-15	Courtesy of FORD MOTOR COMPANY	C1822-34
C1822-15	Courtesy of FORD MOTOR COMPANY	C1822-35
C1822-15	Courtesy of FORD MOTOR COMPANY	C1822-40
C1822-13	Courtesy of FORD MOTOR COMPANY	C1822-41
C1822-13	Courtesy of FORD MOTOR COMPANY	C1822-47

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1822-2	Courtesy of FORD MOTOR COMPANY	C1822-17
C1822-2	Courtesy of FORD MOTOR COMPANY	C1822-18
C1822-2	Courtesy of FORD MOTOR COMPANY	C1822-24
C1822-2	Courtesy of FORD MOTOR COMPANY	C1822-34
C1822-2	Courtesy of FORD MOTOR COMPANY	C1822-35
C1822-2	Courtesy of FORD MOTOR COMPANY	C1822-40
C1822-2	Courtesy of FORD MOTOR COMPANY	C1822-41
C1822-2	Courtesy of FORD MOTOR COMPANY	C1822-47

L7 CHECK MAIN CONTROL WIRING HARNESS FOR AN OPEN CIRCUIT

Are the resistances less than 3 ohms?

Yes

GO to L9

No	INSTALL a new main control wiring harness. REFER to: Transmission Internal Wiring Harness .

Ignition OFF.

REMOVE the transmission fluid pan. REFER to: Transmission Fluid Pan, Gasket and Filter .

Disconnect Transmission Internal Wiring Harness Connector C1840 .

Disconnect Transmission Internal Wiring Harness Connector C1841 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
Courtesy of FORD MOTOR COMPANY Transmission component side, pin 24	Courtesy of FORD MOTOR COMPANY	C1840-2
Courtesy of FORD MOTOR COMPANY Transmission component side, pin 25	Courtesy of FORD MOTOR COMPANY	C1841-2
Courtesy of FORD MOTOR COMPANY Transmission component side, pin 11	Courtesy of FORD MOTOR COMPANY	C1840-1
Courtesy of FORD MOTOR COMPANY Transmission component side, pin 11	Courtesy of FORD MOTOR COMPANY	C1841-1

L8 CHECK MAIN CONTROL WIRING HARNESS FOR A SHORT TO GROUND

Are the resistances greater than 10, 000 ohms?

Yes

GO to L9

No	INSTALL a new main control wiring harness. REFER to: Transmission Internal Wiring Harness .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1840-2	Courtesy of FORD MOTOR COMPANY	Ground
C1841-2	Courtesy of FORD MOTOR COMPANY	Ground
C1840-1	Courtesy of FORD MOTOR COMPANY	Ground
C1841-1	Courtesy of FORD MOTOR COMPANY	Ground

L9 CHECK SOLENOID RESISTANCE

Is the solenoid resistance within specification?

Yes	The concern is not present at this time, inspect for loose connections.

No	INSTALL a new solenoid for the solenoid that failed the resistance check. REFER to: Shift Solenoids (SS) .

Measure and record the resistance of the suspected solenoid. REFER to: Shift Solenoids (SS) . Compare the recorded value with the chart below:

Solenoid	Ohms
LPC solenoid	4.6 to 5.2
TCC solenoid	4.6 to 5.2