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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1002 (Automatic Transmission (Re0F09B)) >> Component Diagnosis >> P0720 Vehicle Speed Sensor CVT (Secondary Speed Sensor) >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR)

    With CONSULT-III

    Check the pulse when vehicle drive.

    TERMINAL CONDITION REFERENCE

    TCM connector Condition Data (Approx.)
    Connector Terminal
    F15 34 When driving ["D" position, 20 km/h (12 MPH)] 390 Hz

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: GO TO 2.

    Fig 1: Checking Pulse Between Secondary Speed Sensor Terminal 34 And Ground
    G05689310Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK POWER AND SENSOR GROUND
    1. Turn ignition switch OFF.
    2. Disconnect output speed sensor (secondary speed sensor) connector.
    3. Turn ignition switch ON.
    4. Check voltage between output speed sensor (secondary speed sensor) vehicle side harness connector terminals.
      TERMINAL VOLTAGE REFERENCE

      Output speed sensor (secondary speed sensor) vehicle side harness connector Voltage (Approx.)
      Connector Terminal
      F23 1 3 Battery voltage
      Fig 2: Checking Voltage Between Secondary Speed Sensor Vehicle Side Harness Connector Terminals
      G05689311Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Check voltage between output speed sensor (secondary speed sensor) vehicle side harness connector terminal and ground.
    TERMINAL VOLTAGE REFERENCE

    Output speed sensor (secondary speed sensor) vehicle side harness connector Ground Voltage (Approx.)
    Connector Terminal
    F23 3 Battery voltage

    Is the inspection result normal? 

    YES: GO TO 3.

    NO-1(Battery voltage is not supplied between terminals 1 and 3, terminal 3 and ground): GO TO 6.

    NO-2(Battery voltage is not supplied between terminals 1 and 3 only): GO TO 8.

    Fig 3: Checking Voltage Between Secondary Speed Sensor Vehicle Side Harness Connector Terminal 3 And Ground
    G05689312Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (SENSOR GROUND)
    1. Turn ignition switch OFF.
    2. Disconnect TCM connector.
    3. Check continuity between TCM vehicle side harness connector terminal and ground.
    TERMINAL CONTINUITY REFERENCE

    TCM vehicle side harness connector Ground Continuity
    Connector Terminal
    F15 7 Not existed

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Repair or replace damaged parts.

    Fig 4: Checking Continuity Between TCM Vehicle Side Harness Connector Terminal 7 And Ground
    G05689313Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (PART 1)

    Check continuity between TCM vehicle side harness connector terminal and output speed sensor (secondary speed sensor) vehicle side harness connector terminal.

    TERMINAL CONTINUITY REFERENCE

    TCM vehicle side harness connector Output speed sensor (secondary speed sensor) vehicle side harness connector Continuity
    Connector Terminal Connector Terminal
    F15 (A) 34 F23 (B) 2 Existed

    Is the inspection result normal? 

    YES: GO TO 5.

    Fig 5: Checking Continuity Between TCM And Secondary Speed Sensor Vehicle Side Harness Connector Terminals
    G05689314Courtesy of NISSAN MOTOR CO., U.S.A.

    NO: Repair or replace damaged parts.

  5. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (PART 2)

    Check continuity between TCM vehicle side harness connector terminal and ground.

    TERMINAL CONTINUITY REFERENCE

    TCM vehicle side harness connector Ground Continuity
    Connector Terminal
    F15 34 Not existed

    Is the inspection result normal? 

    YES: GO TO 10.

    NO: Repair or replace damaged parts.

    Fig 6: Checking Continuity Between TCM Vehicle Side Harness Connector Terminal 34 And Ground
    G05689315Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK HARNESS BETWEEN IPDM E/R AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (POWER) (PART 1)
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R connector.
    3. Check continuity between IPDM E/R vehicle side harness connector terminal and output speed sensor (secondary speed sensor) vehicle side harness connector terminal.
    TERMINAL CONTINUITY REFERENCE

    IPDM E/R vehicle side harness connector Output speed sensor (secondary speed sensor) vehicle side harness connector Continuity
    Connector Terminal Connector Terminal
    F10 (A) 58 F23 (B) 3 Existed

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: Repair or replace damaged parts.

    Fig 7: Checking Continuity Between IPDM E/R And Secondary Speed Sensor Vehicle Side Harness Connector Terminals
    G05689316Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK HARNESS BETWEEN IPDM E/R AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (POWER) (PART 2)

    Check continuity between IPDM E/R vehicle side harness connector terminal and ground.

    TERMINAL CONTINUITY REFERENCE

    IPDM E/R vehicle side harness connector Ground Continuity
    Connector Terminal
    F10 58 Not existed

    Is the inspection result normal? 

    YES: Check the following. If NG, repair or replace damaged parts.

    • Harness for short or open between ignition switch and IPDM E/R
    • 10A fuse (No. 34, located in IPDM E/R)
    • Ignition switch

    NO: Repair or replace damaged parts.

    Fig 8: Checking Continuity Between IPDM E/R Vehicle Side Harness Connector Terminal 58 And Ground
    G05689317Courtesy of NISSAN MOTOR CO., U.S.A.
  8. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (SENSOR GROUND) (PART 1)
    1. Turn ignition switch OFF.
    2. Disconnect TCM connector.
    3. Check continuity between TCM vehicle side harness connector terminal and output speed sensor (secondary speed sensor) vehicle side harness connector terminal.
    TERMINAL CONTINUITY REFERENCE

    TCM vehicle side harness connector Output speed sensor (secondary speed sensor) vehicle side harness connector Continuity
    Connector Terminal Connector Terminal
    F15 (A) 7 F23 (B) 1 Existed

    Is the inspection result normal? 

    YES: GO TO 9.

    NO: Repair or replace damaged parts.

    Fig 9: Checking Continuity Between TCM And Secondary Speed Sensor Vehicle Side Harness Connector Terminals
    G05689318Courtesy of NISSAN MOTOR CO., U.S.A.
  9. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (SENSOR GROUND) (PART 2)

    Check continuity between TCM vehicle side harness connector terminal and ground.

    TERMINAL CONTINUITY REFERENCE

    TCM vehicle side harness connector Ground Continuity
    Connector Terminal
    F15 7 Not existed

    Is the inspection result normal? 

    YES: GO TO 10.

    NO: Repair or replace damaged parts.

    Fig 10: Checking Continuity Between TCM Vehicle Side Harness Connector Terminal 7 And Ground
    G05689313Courtesy of NISSAN MOTOR CO., U.S.A.
  10. CHECK TCM
    1. Replace with the same type of TCM. Refer to "EXPLODED VIEW ".
    2. Perform "DTC CONFIRMATION PROCEDURE". Refer to "DTC LOGIC ".

    Is "P0720 VEH SPD SEN/CIR AT" detected? 

    YES: Replace the secondary speed sensor. Refer to "EXPLODED VIEW ".

    NO: Replace TCM. Refer to "EXPLODED VIEW ".

  11. DETECT MALFUNCTIONING ITEMS

    Check TCM connector pin terminals for damage or loose connection with harness connector.

    Is the inspection result normal? 

    YES: Replace TCM. Refer to "EXPLODED VIEW ".

    NO: Repair or replace damaged parts.

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