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1 Page 1 of Ford Pickup 5.4L Eng VIN L F250 Super Duty 1Search Print Date: P0720 Pinpoint Test F: Turbine Shaft Speed (TSS) And Output Shaft Speed () Sensors NOTE: Refer to the Output Shaft Speed () Sensor Harness Connector illustration preceding these pinpoint tests.
2 Page 2 of 9 Fig 1: Pinpoint Test F: Shift Solenoids Step F1-F3 Courtesy of FORD MOTOR CO. Pinpoint Test TJ: Output Shaft Speed () Sensor Introduction Introduction
3 Page 3 of 9 NOTE: This pinpoint test is intended to diagnose the following:. PCM. Harness circuits:. SIGRTN.
4 Page 4 of 9 Fig 2: Identifying Output Shaft Speed () Connector Courtesy of FORD MOTOR CO. Powertrain Control Module (PCM) Connector For PCM connector views or reference values, refer to REFERENCE VALUES - CNG, FLEX- FUEL & GASOLINE.
5 Page 5 of 9 Connector Circuit Pin 104 Pin PWRGND SIGRTN Test Procedure Tip: P0720/P0722 TJ1 DTCS P0720, P0721, P0722, P0723 AND P1900: VERIFY DRIVE CYCLE Access the PCM - PID. Drive the vehicle. Monitor the PID in all transmission gear ranges while increasing and decreasing the speed. Does the PID reading increase and decrease with engine and vehicle speed? performed as expected GO to TJ2. GO to TJ3. TJ2 VISUAL INSPECTION connector disconnected. INSPECT the harness for damage. INSPECT the vehicle harness connector for damage and proper seating. If possible, carry out a wiggle test. Have any problems been found? REPAIR FAULT GO to Z1. TJ3 VERIFY THE TYPE OF SENSOR INSPECT for a Hall-effect or VR-type sensor. Is this a Hall-effect type sensor? GO to TJ4. GO to TJ6. TJ4 CHECK THE VPWR TO THE SENSOR
6 Page 6 of 9 connector disconnected. Key ON Engine OFF. Measure the voltage between: ( + ) Connector, Harness Side (-)Vehicle battery VPWR Negative terminal Is the voltage greater than 10.5 V? GO to TJ5. REPAIR the open circuit. TJ5 CHECK THE VPWR GROUND TO THE SENSOR ( + ) Connector, Harness Side ( - )Vehicle battery PWRGND Negative terminal Is the resistance less than 5 ohms? GO to TJ6. REPAIR the open circuit. TJ6 CHECK THE CIRCUIT FOR A SHORT TO VREF AND VPWR IN THE HARNESS Key ON Engine OFF. connector disconnected. Measure the voltage between: ( + ) Connector, Harness Side ( - )Vehicle battery Negative terminal Is the voltage less than 1 V? GO to TJ7. REPAIR the short circuit.
7 Page 7 of 9 TJ7 CHECK THE CIRCUIT FOR AN OPEN IN THE HARNESS PCM connector disconnected. connector disconnected. ( + )PCM Connector, Harness Side (-) Connector, Harness Side - Pin 84 SIGRTN - Pin 91 SIGRTN NOTE: Hall-effect sensors are not equipped with a SIGRTN circuit. Are the resistances less than 5 ohms? GO to TJ8. REPAIR the open circuit. TJ8 CHECK THE CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS ( + ) Connector, Harness Side ( - ) Connector, Harness Side PWRGND SIGRTN ( + ) Connector, Harness Side ( - ) Ground Are the resistances greater than 10 KOhm?? GO to TJ9. REPAIR the short circuit. TJ9 VERIFY THE TYPE OF SENSOR INSPECT for a Hall-effect or VR-type sensor. Is this a Hall-effect type sensor?
8 Page 8 of 9 GO to TJ10. GO to TJ11. TJ10 CHECK THE SIGNAL OUTPUT TO THE PCM, HALL-EFFECT TYPE SENSOR PCM connector disconnected. Raise the vehicle to allow rotation of the front drive wheels. Key ON Engine OFF. Transmission in NEUTRAL. Measure the voltage between: ( + )PCM Connector, Harness Side ( - )PCM Connector, Harness Side - Pin 84 PWRGND - Pin 103 NOTE: The opposite wheel must be held stationary. The voltage should rise above 5 volts and fall below 1 volt in a regular cycle. Observe several cycles. Does the output voltage rise and fall as specified? REPLACE the PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM. REPLACE the sensor. TJ11 CHECK THE RESISTANCE OF THE SENSOR ( + ) Connector, Component Side ( - ) Connector, Component Side SIGRTN Is the resistance between 400 ohms K ohms? REPLACE the PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM. REPLACE the.
9 Page 9 of 9 P0720 Code Description Insufficient input from sensor. Testing See Pinpoint Test F: Turbine Shaft Speed (TSS) And Output Shaft Speed () Sensors. P INSUFFICIENT INPUT FROM THE OUTPUT SHAFT SPEED SENSOR P INSUFFICIENT INPUT FROM THE OUTPUT SHAFT SPEED SENSOR Description: Possible Causes: The output shaft speed sensor inputs a signal to the PCM, based on the speed of the output shaft of the transmission. The PCM compares this signal with the signal of the VSS or TCSS and determines correct tire size and axle gear ratio. sensor circuit short to GND. sensor circuit short to PWR. sensor circuit open. Damaged sensor. Damaged PCM. 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 TJ: Output Shaft Speed () Sensor Introduction STEP 1 All Others - - All Automatic Transmissions go to the appropriate AUTOMATIC TRANSMISSION article.
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