Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
Powertrain DTC Charts and Descriptions 4-93
Diagnostic Trouble Code (DTC) Charts and Descriptions
P0704 - Clutch Switch Input Circuit
Description: When the clutch pedal is applied the voltage switches to low. This DTC sets if the PCM does not see the clutch
pedal voltage change from high to low.
Possible Causes: • CPP circuit short to voltage
• Damaged clutch pedal position (CPP) switch
• SIGRTN circuit open
Diagnostic Aids: When the clutch pedal is applied and then released, the clutch pedal switch voltage should cycle.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test TA.
P0720 - Output Shaft Speed (OSS) Sensor Circuit
Description: This DTC sets when the OSS sensor signal input exceeds the calibrated threshold. The OSS sensor provides a
signal to the PCM based on the speed of the output shaft of the transmission.
Possible Causes: • OSS circuit short to ground
• OSS circuit short to voltage
• OSS circuit open
• Damaged OSS sensor
Diagnostic Aids: Verify the sensor signal output varies with the vehicle speed.
Application Key On Engine Off Key On Engine Running Continuous Memory
Manual Transmission GO to Pinpoint Test DP.
Automatic Transmission Refer to the Workshop Manual Section 307-01, Automatic Transmission, Diagnostic Trouble Code (DTC)
Index to continue diagnosis.
P0721 - Output Shaft Speed (OSS) Sensor Circuit Range/Performance
Description: This DTC sets when the OSS sensor signal input exceeds the calibrated threshold or has excessive electrical
noise. The OSS signal is very sensitive to electrical noise. This electrical noise distorts the OSS input to the PCM.
Possible Causes: • Incorrect OSS wiring harness routing
• Aftermarket add-on
• OSS wiring damaged
• OSS wiring insulation wear
Diagnostic Aids: Check the routing of the OSS wiring harness.
Check the OSS wiring and the OSS connector for damage.
Application Key On Engine Off Key On Engine Running Continuous Memory
Manual Transmission GO to Pinpoint Test DP.
Automatic Transmission Refer to the Workshop Manual Section 307-01, Automatic Transmission, Diagnostic Trouble Code (DTC)
Index to continue diagnosis.
P0722 - Output Shaft Speed (OSS) Sensor Circuit No Signal
Description: This DTC sets when the OSS sensor signal is missing upon the initial movement of the vehicle.
Possible Causes: • Damaged OSS connector
• Damaged OSS sensor
• Incorrectly installed OSS sensor
• OSS wiring harness intermittent short
• OSS wiring harness open
Diagnostic Aids: Check the wiring, connector, and OSS sensor for damage.
Application Key On Engine Off Key On Engine Running Continuous Memory
Manual Transmission GO to Pinpoint Test DP.
Automatic Transmission Refer to the Workshop Manual Section 307-01, Automatic Transmission, Diagnostic Trouble Code (DTC)
Index to continue diagnosis.
2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.