LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 642 (Automatic Transmission - 10-Speed Automatic Transmission - 10R80 (DTC Charts 5.0L - Assembly)) >> Diagnosis And Testing >> DTC Chart and Pinpoint Tests - 5.0L 32V Ti-VCT >> Pinpoint Tests >> Pinpoint Test I: OSS, TSS, ISSA, ISSB Sensor (Performance)

Pinpoint Test I: OSS, TSS, ISSA, ISSB Sensor (Performance)

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to Wiring Diagrams TRANSMISSION CONTROLS - 10R80 for schematic and connector information.

    Normal Operation and Fault Conditions 

    These diagnostic trouble codes (DTCs) indicate a non-electrical fault with one of the transmission speed sensors. The PCM determined the sensor and circuit are electrically okay, but detected a sensor drop out, a noise spike, or a mismatch in sensor speed readings for the gear commanded. This could be caused by too large of a sensor air gap, an undetected clutch fault, internal transmission failure or a sensor fault.

    TSS Sensor 

    The TSS sensor is a Hall-effect type sensor that provides a signal to the PCM that changes in frequency as the rotating speed of the planetary carrier No. 2 varies. The PCM compares the TSS sensor signal with the engine speed information to determine the amount of slip occurring in the torque converter. The PCM also compares the TSS sensor signal with the OSS sensor signal to determine the gear ratio provided by the planetary carrier No. 4. The PCM uses the TSS sensor signal as an input for its shift strategies and TCC operation. The PCM also uses the TSS sensor signal for transmission fault detection and diagnostics.

    OSS Sensor 

    The OSS sensor is a Hall-effect type sensor that provides a signal to the PCM that changes in frequency as the rotating speed of the rear planetary carrier No. 4 varies. The PCM also compares the OSS sensor signal with the TSS sensor signal to determine the gear ratio provided by the rear planetary gearset. The PCM uses the OSS sensor signal as an input for its shift strategies and TCC operation. The PCM also uses the OSS sensor signal for transmission fault detection and diagnostics.

    Intermediate Speed Sensors A and B 

    The Intermediate Speed Sensors A (ISSA) and B (ISSB) are Hall-effect type sensors that provide a signal to the PCM that changes in frequency as the rotating speed of the component being monitored changes. ISSA monitors the speed and rotational direction of ring gear 1 and ISSB monitors the speed and rotational direction of planetary carrier-1/ring gear 4. The Intermediate speed sensors are used to monitor clutch states for transmission fault detection and diagnostics.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P0716:00 Input/Turbine Shaft Speed Sensor "A" Circuit Range/Performance: No Sub Type Information This DTC indicates the TSS sensor failed a rationality test. This could be caused by too large of a sensor air gap, a sensor fault, or an undetected clutch fault.
    PCM P0721:00 Output Shaft Speed Sensor Circuit Range/Performance: No Sub Type Information This DTC indicates the OSS sensor failed a rationality test. This could be caused by too large of a sensor air gap, a sensor fault, or an undetected clutch fault.
    PCM P0792:00 Intermediate Shaft Speed Sensor "A" Circuit Range/Performance: No Sub Type Information This DTC indicates the intermediate shaft speed A (ISSA) sensor failed a rationality test. This could be caused by too large of a sensor air gap, a sensor fault, or an undetected clutch fault.
    PCM P2746:00 Intermediate Shaft Speed Sensor "B" Circuit Range/Performance: No Sub Type Information This DTC indicates the intermediate shaft speed B (ISSB) sensor failed a rationality test. This could be caused by too large of a sensor air gap, a sensor fault, or an undetected clutch fault.

    Possible Sources 

    • Loose sensor or incorrect air gap
    • speed sensor fault
    • Undetected clutch fault

  2. I1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, carry out the PCM self-test.

    Are any gear ratio, clutch fault or speed sensor circuit fault diagnostic trouble codes (DTCs) present? 

    Yes  RESOLVE any gear ratio, clutch fault or speed sensor circuit fault diagnostic trouble codes (DTCs) first.
    No  For DTC P0716, GO to  I2 For DTC P0721, GO to  I3 For DTC P0792, GO to  I4 For DTC P2746, GO to  I5

  3. I2 CHECK THE TSS SENSOR

    • Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the PCM.

    • NOTE: The PCM will disable all gears except 7th and reverse if it detects a speed sensor fault. This is a failsafe action that does not necessarily indicate an internal transmission fault.

      Road test the vehicle. Pay attention for any observable symptoms that could indicate a clutch fault or internal transmission failure.

    • Ignition OFF.

    • Road test the vehicle a second time.

    • Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the PCM.

    Is DTC P0716 present? 

    Yes  If any gear ratio, clutch fault or speed sensor circuit fault diagnostic trouble codes (DTCs) are now present, RESOLVE those first. If any observable symptoms that indicate a clutch fault or internal transmission failure are present, RESOLVE those next. REFER to: Diagnosis By Symptom . If DTC P0716 returns alone, REMOVE the main control valve body and INSPECT the TSS sensor. Make sure it is properly mounted and free of damage. CHECK the vehicle wiring harness for any possible sources of RFI. REPAIR or INSTALL new components as necessary. REFER to: Turbine Shaft Speed (TSS) Sensor .
    No  A TSS sensor fault is not present at this time. If any observable symptoms are present, REFER to: Diagnosis By Symptom .

  4. I3 CHECK THE OSS SENSOR

    • Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the PCM.

    • NOTE: The PCM will disable all gears except 7th and reverse if it detects a speed sensor fault. This is a failsafe action that does not necessarily indicate an internal transmission fault.

      Road test the vehicle. Pay attention for any observable symptoms that could indicate a clutch fault or internal transmission failure.

    • Ignition OFF.

    • Road test the vehicle a second time.

    • Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the PCM.

    Is DTC P0721 present? 

    Yes  If any gear ratio, clutch fault or speed sensor circuit fault diagnostic trouble codes (DTCs) are now present, RESOLVE those first. If any observable symptoms that indicate a clutch fault or internal transmission failure are present, RESOLVE those next. REFER to: Diagnosis By Symptom . If DTC P0721 returns alone, REMOVE the transmission fluid auxiliary pump and INSPECT the OSS sensor. Make sure it is properly mounted and free of damage. CHECK the vehicle wiring harness for any possible sources of RFI. REPAIR or INSTALL new components as necessary. REFER to: Output Shaft Speed (OSS) Sensor .
    No  An OSS sensor fault is not present at this time. If any observable symptoms are present, REFER to: Diagnosis By Symptom .

  5. I4 CHECK THE INTERMEDIATE SHAFT SPEED A (ISSA) SENSOR

    • Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the PCM.

    • NOTE: The PCM will disable all gears except 7th and reverse if it detects a speed sensor fault. This is a failsafe action that does not necessarily indicate an internal transmission fault.

      Road test the vehicle. Pay attention for any observable symptoms that could indicate a clutch fault or internal transmission failure.

    • Ignition OFF.

    • Road test the vehicle a second time.

    • Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the PCM.

    Is DTC P0792 present? 

    Yes  If any gear ratio, clutch fault or speed sensor circuit fault diagnostic trouble codes (DTCs) are now present, RESOLVE those first. If any observable symptoms that indicate a clutch fault or internal transmission failure are present, RESOLVE those next. REFER to: Diagnosis By Symptom . If DTC P0792 returns alone, REMOVE the main control valve body and INSPECT the intermediate shaft speed A (ISSA) sensor. Make sure it is properly mounted and free of damage. CHECK the vehicle wiring harness for any possible sources of RFI. REPAIR or INSTALL new components as necessary. REFER to: Intermediate Speed Sensor A (ISSA) .
    No  An intermediate shaft speed A (ISSA) sensor fault is not present at this time. If any observable symptoms are present, REFER to: Diagnosis By Symptom .

  6. I5 CHECK INTERMEDIATE SHAFT SPEED B (ISSB) SENSOR

    • Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the PCM.

    • NOTE: The PCM will disable all gears except 7th and reverse if it detects a speed sensor fault. This is a failsafe action that does not necessarily indicate an internal transmission fault.

      Road test the vehicle. Pay attention for any observable symptoms that could indicate a clutch fault or internal transmission failure.

    • Ignition OFF.

    • Road test the vehicle a second time.

    • Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the PCM.

    Is DTC P2746 present? 

    Yes  If any gear ratio, clutch fault or speed sensor circuit fault diagnostic trouble codes (DTCs) are now present, RESOLVE those first. If any observable symptoms that indicate a clutch fault or internal transmission failure are present, RESOLVE those next. REFER to: Diagnosis By Symptom . If DTC P2746 returns alone, REMOVE the main control valve body and INSPECT the intermediate shaft speed B (ISSB) sensor. Make sure it is properly mounted and free of damage. CHECK the vehicle wiring harness for any possible sources of RFI. REPAIR or INSTALL new components as necessary. REFER to: Intermediate Speed Sensor B (ISSB) .
    No  An intermediate shaft speed B (ISSB) sensor fault is not present at this time. If any observable symptoms are present, REFER to: Diagnosis By Symptom .
scientia non olet · About LEMON Manuals