Pinpoint Test D : TSS Sensor

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If the scan tool is unable to access the transmission PIDs, refer to Engine Controls - Introduction (Except Diesel & Hybrid) .

NOTE: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.

NOTE: Read and record all DTCs.

NOTE: If DTCs P0705, P0706, P0707, P0708, P0709, P1702, P1705 and/or P1921 are set, diagnose those s first.

D1 DRIVE CYCLE TEST
- Using a diagnostic scan tool, monitor the TSS_SRC PID while road testing the vehicle. Drive the vehicle so the transmission upshifts and downshifts through all the gears.
Does the TSS sensor rpm increase and decrease with engine rpm and vehicle speed?

Yes REFER to Shift Point Road Test .

No GO to D2.

D2 CHECK TSS SENSOR SIGNAL CIRCUIT FOR POWER

Ignition OFF.

Disconnect: Transmission Vehicle Harness C1575 .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1575-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage less than 4.8 volts?

Yes	GO to D3.
No	GO to D6.

D3 CHECK THE TSS SENSOR SIGNAL CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: PCM C175E .

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

Measure:

Positive Lead	Measurement / Action	Negative Lead
C175E-27	Courtesy of FORD MOTOR COMPANY	C1575-1

Is the resistance less than 3 ohms?

Yes	GO to D4.
No	INSPECT and REPAIR transmission vehicle harness TSS signal circuit for an open. If an open circuit is not found, INSTALL a new PCM, REFER to Electronic Engine Controls . PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy

D4 CHECK THE TSS SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1575-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes	GO to D5
No	INSPECT and REPAIR transmission vehicle harness TSS signal circuit for a short to ground. If a short to ground is not found, INSTALL a new PCM, REFER to Electronic Engine Controls . PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy .

D5 CHECK THE TSS SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Connect: PCM C175E .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1575-1	Courtesy of FORD MOTOR COMPANY	Ground

Is voltage greater than 5.1 volts?

Yes	INSPECT and REPAIR transmission vehicle harness TSS signal circuit for a short to power. If a short to power is not found, INSTALL a new PCM, REFER to Electronic Engine Controls . PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy .
No	GO to D6.

D6 CHECK THE TSS SENSOR GROUND CIRCUIT

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1575-1	Courtesy of FORD MOTOR COMPANY	C1575-5

Is voltage less than 4.8 volts?

Yes	REPAIR the transmission vehicle harness signal return circuit for an open. If an open is not found, INSTALL a new PCM, REFER to Electronic Engine Controls . PROGRAM the PCM with the latest calibration level. PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy .
No	INSTALL a new molded leadframe, REFER to Shift Solenoids (SS) . CLEAR the DTC s.