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Home >> Mitsubishi >> 2014 >> Lancer ES Sportback >> Repair and Diagnosis >> External Pages >> Different car >> Section 52 (Automatic Transaxle On-Vehicle Service - With Diagnostics) >> Automatic Transaxle Diagnosis < A/T > >> Diagnostic Trouble Code Procedures >> DTC P0720: Output Shaft Speed Sensor System >> Diagnosis

DTC P0720: Output Shaft Speed Sensor System: Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. STEP 1. Check the TCM terminal voltage and frequency. 

    [TCM connector (harness side, connected)]

    Check that the voltage between PGB-terminal and GND1 or GND2 terminal is 0 V, and then check the frequency of PGB1 terminal.

    • At D range, vehicle speed is 30 km/h (18.6 mph): Approx. 588 Hz

    Q: Is the check result normal? 

    • YES:  Go to  Step 6.
    • NO:  Go to Step 2.
  2. STEP 2. Check the power supply and sensor ground. 

    [Output shaft speed sensor connector (harness side, disconnected)]

    • With the ignition switch ON: Power supply terminal to ground terminal → Battery positive voltage

    Q: Is the check result normal? 

    • YES:  Go to Step 3.
    • NO:  Go to  Step 4.
  3. STEP 3. Check for continuity in PGB1 line between the input shaft speed sensor connector and TCM connector. 

    When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.

    Q: Is the check result normal? 

    • YES:  Replace the output shaft speed sensor with the one of the same transaxle of the same model. Then go to  Step 7.
    • NO:  Repair the connector(s) or wiring harness, and then go to  Step 6.
  4. STEP 4. Check the path between the battery and the output shaft speed sensor. 
    • Check the power supply line for an open/short circuit between the battery and output shaft speed sensor connector.
    • Check for a blown fuse.

    Q: Is the check result normal? 

    • YES:  Go to Step 5.
    • NO:  Repair the connector(s) or wiring harness.
  5. STEP 5. Check for continuity in PGB- line between the input shaft speed sensor connector and TCM connector. 

    When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.

    Q: Is the check result normal? 

    • YES:  Go to  Step 8.
    • NO:  Repair the connector(s) or wiring harness.
  6. STEP 6. Drive the vehicle for a while. 

    Check that the normal code is displayed.

    Q: Is the check result normal? 

    • YES:  The procedure is complete.
    • NO:  Replace the TCM.
  7. STEP 7. After replacing the output shaft speed sensor, drive the vehicle for a while, and then check the DTC again. 

    Q: Is the check result normal? 

    • YES:  Replace the output shaft speed sensor.
    • NO:  Replace the TCM. Than go to  Step 9.
  8. STEP 8. Check the TCM connector pin terminal and the connection status. 

    Q: Is there a failure point? 

    • YES:  Repair or replace the failure section.
    • NO:  Replace the TCM.
  9. STEP 9. DTC recheck. 
    1. Erase the DTC.
    2. Drive the vehicle at 20 km/h (12.4 mph) or more.
    3. Check if the DTC is stored.

    Q: Is the DTC stored? 

    • YES:  Remove the A/T. Carry out the internal check and repair the defective part (the output shaft speed sensor rotor may be defective).
    • NO:  The procedure is complete.
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