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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2406 (Engine Control System - DTCS P0603 To P2A03 (VK56DE)) >> DTC P1564: ASCD Steering Switch >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTIONS
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body.

    Refer to "GROUND INSPECTION ".

    Fig 1: Checking Ground Connections
    G08165182Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

  2. CHECK ASCD STEERING SWITCH CIRCUIT

    With CONSULT 

    1. Turn ignition switch ON.
    2. Select "MAIN SW", "CANCEL SW", "RESUME/ACC SW" and "SET SW" in "DATA MONITOR" mode with CONSULT.
    3. Check each item indication under the following conditions.
    Switch Monitor item Condition Indication
    MAIN switch MAIN SW Pressed ON
    Released OFF
    CANCEL switch CANCEL SW Pressed ON
    Released OFF
    RESUME/ACCELERATE switch RESUME/ACC SW Pressed ON
    Released OFF
    SET/COAST switch SET SW Pressed ON
    Released OFF

    Without CONSULT 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 99 and ground with pressing each button.
    Switch Condition Voltage (V)
    MAIN switch Pressed Approx. 0
    Released Approx. 4
    CANCEL switch Pressed Approx. 1
    Released Approx. 4
    RESUME/ACCELERATE switch Pressed Approx. 3
    Released Approx. 4
    SET/COAST switch Pressed Approx. 2
    Released Approx. 4
    Fig 2: Checking Voltage Between ECM Terminal 99 And Ground
    G08165183Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO  8.

    NG: GO TO 3.

  3. CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect combination switch harness connector M102.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between combination switch terminal 15 and ECM terminal 67.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

    5. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M31, E152
    • Harness connectors E5, F14
    • Combination switch (spiral cable)
    • Harness for open and short between ECM and combination switch

    Repair open circuit or short to ground or short to power in harness or connectors.

  5. CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check harness continuity between ECM terminal 99 and combination switch terminal 14.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

    2. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  7.

    NG: GO TO 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M31, E152
    • Combination switch (spiral cable)
    • Harness for open and short between ECM and combination switch

    Repair open circuit or short to ground or short to power in harness or connectors.

  7. CHECK ASCD STEERING SWITCH

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 8.

    NG: Replace ASCD steering switch. Refer to REMOVAL AND INSTALLATION .

  8. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    >> INSPECTION END 

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