Pinpoint Test L : DTCS P0720, P0721, P0722

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

Refer to TRANSMISSION CONTROLS for schematic and connector information.

Normal Operation and Fault Conditions

The OSS sensor is a Hall-effect sensor that sends a signal to the PCM that indicates transmission output shaft speed. The OSS sensor is used for TCC control and shift scheduling.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P0720:00	Output Shaft Speed Sensor Circuit: No Sub Type Information	No input from the OSS sensor.
PCM P0721:00	Output Shaft Speed Sensor Circuit Range/Performance: No Sub Type Information	Unrealistic change in the OSS sensor signal, erratic or intermittently no input.
PCM P0722:00	Output Shaft Speed Sensor Circuit No Signal: No Sub Type Information	No input from the OSS sensor.

Possible Sources

Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
OSS sensor
PCM

L1 RETRIEVE AND RECORD ALL DTCS

Using the diagnostic scan tool, retrieve all diagnostic trouble codes (DTCs).

Are diagnostic trouble codes (DTCs) P0720, P0721, P0722 and/or P0715, present?

Yes	For diagnostic trouble codes (DTCs) P0720, P0721 and P0722, GO to L2 For diagnostic trouble codes (DTCs) P0715 and P0720, GO to L6

No	REFER to: Diagnosis By Symptom .

L2 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR SIGNAL CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect Transmission Vehicle Harness C1909.

Disconnect PCM C1915E.

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

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1909-19	Courtesy of FORD MOTOR COMPANY	C1915E-12

Is the resistance less than 3 ohms?

Yes

GO to L3

No	REPAIR the circuit.

L3 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1909-19	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to L4

No	REPAIR the circuit.

L4 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR SIGNAL CIRCUIT FOR A SHORT TO POWER

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1909-19	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to L5

L5 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR GROUND CIRCUIT

Ignition OFF.

Connect PCM C1915E.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1909-18	Courtesy of FORD MOTOR COMPANY	C1909-20

Is voltage less than 4.8 volts?

Yes	INSPECT and REPAIR the circuit. If an open circuit is not found, Refer to PCM GUIDED ROUTINE TESTING

No	INSTALL a new OSS sensor. REFER to: Output Shaft Speed (OSS) Sensor .

L6 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR VEHICLE POWER CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect Transmission Vehicle Harness C1909.

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

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1909-18	Courtesy of FORD MOTOR COMPANY	Ground

Is voltage less than 9.5 volts?

Yes	INSPECT and REPAIR the circuit. If an open circuit is not found, Refer to PCM GUIDED ROUTINE TESTING

No	CLEAR the DTC. If diagnostic trouble codes (DTCs) P0715 and/or P0720 return, Refer to PCM GUIDED ROUTINE TESTING CARRY OUT the Transmission Strategy Download, REFER to: Transmission Strategy Download .