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Home >> Infiniti >> 2008 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P1148 To P2A03 >> DTC P1564: ICC Steering Switch >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTIONS
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Identifying Body Ground Screw
      G05739631Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

  2. CHECK ICC STEERING SWITCH CIRCUIT

    With CONSULT-III 

    1. Turn ignition switch ON.
    2. Select "MAIN SW", "CANCEL SW", "RESUME/ACC SW", "SET SW" and "DIST SW" in "DATA MONITOR" mode with CONSULT-III.
    3. Check each item indication under the following conditions.
      MONITOR ITEM CONDITION CHART

      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
      DISTANCE switch DIST SW Pressed ON
      Released OFF

    Without CONSULT-III 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 99 and ground with pressing each button.
      Fig 2: Checking Voltage Between ECM Terminal 99 And Ground
      G05739632Courtesy of NISSAN MOTOR CO., U.S.A.
      VOLTAGE REFERENCE CHART

      Switch Condition Voltage [V]
      MAIN switch Pressed Approx. 0
      Released Approx. 4.3
      CANCEL switch Pressed Approx. 1.3
      Released Approx. 4.3
      RESUME/ACCELERATE switch Pressed Approx. 3.7
      Released Approx. 4.3
      SET/COAST switch Pressed Approx. 3.0
      Released Approx. 4.3
      DISTANCE switch Pressed Approx. 2.2
      Released Approx. 4.3

    OK or NG 

    OK: GO TO  8.

    NG: GO TO 3.

  3. CHECK ICC STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect combination switch 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 ICC 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 ICC STEERING SWITCH

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 8.

    NG: Replace ICC steering switch.

  8. CHECK INTERMITTENT INCIDENT

    Refer to "HOW TO CHECK TERMINAL " and "INTERMITTENT INCIDENT ".

    INSPECTION END 

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