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Home >> Mazda >> 2006 >> B4000 Base, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Symptom Troubleshooting [Automatic Transmission] >> Turbine Shaft Speed (TSS), Input Shaft Speed (ISS) And Output Shaft Speed (OSS) Sensors 5R44E And 5R55E Only

Turbine Shaft Speed (TSS), Input Shaft Speed (ISS) And Output Shaft Speed (OSS) Sensors 5R44E And 5R55E Only

DIAGNOSTIC TROUBLE CODE CHART

DTC P0720, P0721, P0791.P0794, P1900 INPUT SHAFT SPEED (ISS) AND OUTPUT SHAFT SPEED (OSS) SENSORS 5R44E AND 5R55E ONLY
DETECTION CONDITION
  • P0720 indicates PCM detected a loss of OSS signal during operation.
  • P0721 indicates PCM detected an erratic OSS signal.
  • P0791 indicates PCM detected ISS sensor signal failure.
  • P0794 indicates PCM detected an intermittent ISS signal.
  • P1900 indicates PCM detected an intermittent OSS signal.
POSSIBLE CAUSE
  • Damaged OSS sensor (P0720, P0721, P1900).
  • Damaged ISS sensor (P0791, P0794).
  • Wiring concerns:
    • Open or short in vehicle harness.
    • Damaged harness or connector.
  • Damaged PCM.
HINT ISS Sensor Description 
  • Magnetic pickup that sends a signal to the PCM to indicate transmission intermediate shaft speed.
OSS Sensor description 
  • Magnetic pickup that sends the PCM torque converter turbine speed information.
  • The PCM uses OSS sensor information to help determine speed scheduling, electronic pressure control (EPC) and torque converter clutch (TCC) operation.
PROBLEM SYMPTOM CHART

DTC P0720, P0721, P0791, P0794, P1900 INPUT SHAFT SPEED (ISS) AND OUTPUT SHAFT SPEED (OSS) SENSORS 5R44E AND 5R55E ONLY
STEP INSPECTION ACTION
1 Was PCM Quick Test performed? Yes Go to step 2.
No Perform PCM Quick Test. See PCM QUICK TEST , .
2 DRIVE TEST
  • Access ISS (P0791, P0794) or OSS (all others) PID with the WDS or equivalent tester.
  • While monitoring ISS or OSS PID, drive the vehicle so that the transmission upshifts and downshifts through all gears.
  • Does the ISS or OSS PID increase and decrease with engine and vehicle speed or is the sensor signal erratic (drop to zero or near zero and return to normal operation)? 
 Yes If the ISS or OSS PID increases and decrease with engine and vehicle speed, clear all DTCs. Road test to verify if concern is still present. If concern is still present, See SYMPTOM TROUBLESHOOTING CHART - AUTOMATIC TRANSMISSION , .
If the sensor signal is erratic, Inspect for intermittent concern in the internal/external harness, sensor, or connector and repair.
Go to step 4.
No If the ISS or OSS PID does not increase and decrease with engine and vehicle speed, inspect for open or short in vehicle harness, sensor, a PCM concern, or internal hardware concern.
If the sensor signal is steady, go to step .
3 CHECK RESISTANCE OF ISS OR OSS SENSOR
  • For ISS and OSS sensor:
    • Disconnect the appropriate vehicle harness connector from the sensor.
    • Connect ohmmeter negative lead to one pin of the sensor and the positive lead to the other pin on the sensor and record the resistance.
  • Is the resistance within specification: 325-615 ohms for TSS sensor, and 305-375 ohms for OSS sensor? 
 Yes See SYMPTOM TROUBLESHOOTING CHART - AUTOMATIC TRANSMISSION , for concern diagnosis.
No Replace sensor.
See OSS SENSOR 5R44E/5R55E REMOVAL / INSTALLATION , . See INTERMEDIATE SHAFT SPEED (ISS) SENSOR REMOVAL / INSTALLATION , .
Go to step 4.
4 VERIFY TROUBLESHOOTING OF DTCs COMPLETED
  • Make sure to reconnect all disconnected connectors.
  • Clear DTCs from PCM memory using WDS or equivalent tester generic OBD-II function.
  • Perform PCM Quick Test.
  • Is same DTC present? 
 Yes Replace PCM and repeat PCM Quick Test.
No If any other DTC is present, go to applicable DTC inspection.
If no DTC is present, troubleshooting complete.
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