Pinpoint Test C : Transmission Control Switch

C1 RETRIEVE AND RECORD ALL DTCS
- Using the diagnostic scan tool, retrieve all Diagnostic Trouble Codes (DTCs).
Is DTC P1780 present?

Yes GO to C2

No REFER to: Instrumentation, Message Center and Warning Chimes

C2 CHECK THE BCM (BODY CONTROL MODULE) FUSE
- Ignition OFF.
- Remove the BCM fuse 85 (7.5A).
- CHECK Fuse 85 (7.5A).
Is the resistance less than 3 ohms?

Yes GO to C6

No GO to C3

C3 CHECK THE BCM (BODY CONTROL MODULE) FOR AN INTERNAL SHORT
- Disconnect BCM C2280F .
- Inspect the connectors for damaged or pushed-out terminals.
- Install a new fuse.
Did the fuse fail?

Yes

No GO to C4

C4 CHECK THE TCS (TRANSMISSION CONTROL SWITCH) POWER CIRCUIT FOR A SHORT TO GROUND

Disconnect Floor Shifter C3245 .

Measure.

Positive Lead	Measurement / Action	Negative Lead
C2280F-17	Courtesy of FORD MOTOR COMPANY	Ground

Is The Resistance Greater Than 10, 000 ohms?

Yes

GO to C5

No	REPAIR the circuit.

C5 CHECK THE TCS (TRANSMISSION CONTROL SWITCH) INPUT CIRCUIT FOR A SHORT TO GROUND

Disconnect PCM C175B .

Measure.

Positive Lead	Measurement / Action	Negative Lead
C175B-5	Courtesy of FORD MOTOR COMPANY	Ground

Is The Resistance Greater Than 10, 000 ohms?

Yes

GO to C8

No	REPAIR the circuit.

C6 CHECK THE TCS (TRANSMISSION CONTROL SWITCH) POWER CIRCUIT FOR AN OPEN

Disconnect Floor Shifter C3245 .

Measure.

Positive Lead	Measurement / Action	Negative Lead
C3245-2	Courtesy of FORD MOTOR COMPANY	C2280F-17

Is The Resistance Less Than 3 ohms?

Yes

GO to C7

No	REPAIR the circuit.

C7 CHECK THE TCS (TRANSMISSION CONTROL SWITCH) INPUT CIRCUIT FOR AN OPEN

Disconnect PCM C175B .

Measure.

Positive Lead	Measurement / Action	Negative Lead
C3245-3	Courtesy of FORD MOTOR COMPANY	C175B-5

Is the resistance less than 3 ohms?

Yes

GO to C8

No	REPAIR the circuit.

C8 CHECK THE TCS (TRANSMISSION CONTROL SWITCH)

Measure.

Positive Lead	Measurement / Action	Negative Lead
Component side TCS pin 2.	Courtesy of FORD MOTOR COMPANY	Component side TCS pin 3.

Is the resistance less than 1.5 ohms with the switch pressed and greater than 10, 000 ohms when released?

Yes

GO to C9

No	INSTALL a new selector lever knob. REFER to: Selector Lever Knob (Automatic Transmission External Controls, Removal and Installation).

C9 CHECK THE PCM (POWERTRAIN CONTROL MODULE)

Install fuse 85 (7.5A).

Connect Floor Shifter C3245 .

Ignition ON.

Measure.

Positive Lead	Measurement / Action	Negative Lead
C175B-5	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 10 volts with the switch pressed and less than 5 volts when released?

Yes

No	REPAIR the circuit.