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Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten two ground screws on the body. Refer to Ground Inspection .
    Fig 1: Loosening/Tightening Ground Screws On Body
    G00732565Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 2.
    2. NG: Repair or replace ground connections.
  2. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I 
    1. Check voltage between ECM terminal 3 and ground under the following conditions with CONSULT-II or tester.
    Fig 2: ECM Terminal 3 And Ground Voltage Table
    G00732566Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 3: Checking Voltage Between ECM Terminal 3 And Ground
    G00732567Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO  10.
    2. NG: GO TO 3.
  3. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect IPDM E/R harness connector E8.
    4. Check continuity between ECM terminal 3 and IPDM E/R terminal 42.

      Refer to Wiring Diagram.

      1. Continuity should exist. 
    5. Also check harness for short to ground and short to power.

    OK or NG

    1. OK: GO TO  5.
    2. NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E12, F3
    • Harness for open or short between ECM and IPDM E/R
      1. : Repair open circuit or short to ground or short to power in harness or connectors.
  5. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-I 
    1. Reconnect all harness connectors disconnected.
    2. Check voltage between ECM terminal 104 and ground with CONSULT-II or tester.
      1. Voltage: Battery voltage 

    OK or NG

    1. OK: GO TO  9.
    2. NG: GO TO 6.
    Fig 4: Checking Voltage Between ECM Terminal 104 And Ground
    G00732568Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-II 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E9.
    3. Check continuity between ECM terminal 104 and IPDM E/R terminal 47.

      Refer to Wiring Diagram.

      1. Continuity should exist. 
    4. Also check harness for short to ground and short to power.

    OK or NG

    1. OK: GO TO  8.
    2. NG: GO TO 7.
  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E11, F2
    • Harness for open or short between ECM and IPDM E/R
      1. : Repair open circuit or short to ground or short to power in harness or connectors.
  8. CHECK FUSE 
    1. Disconnect 15A fuse.
    2. Check 15A fuse for blown.

    OK or NG

    1. OK: GO TO 9.
    2. NG: Replace 15A fuse.
  9. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    OK or NG

    1. OK: Replace IPDM E/R. Refer to IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) - G35 SEDAN .
    2. NG: Repair or replace harness or connectors.
  10. CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect electric throttle control actuator harness connector.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between the following terminals.

      Refer to Wiring Diagram.

      Fig 5: Electric Throttle Control Actuator Terminals Continuity Table
      G00732569Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Also check harness for short to ground and short to power.
    Fig 6: Locating Electric Throttle Control Actuator
    G00732570Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 11.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  11. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY 
    1. Remove the intake air duct.
    2. Check if foreign matter is caught between the throttle valve and the housing.

    OK or NG

    1. OK: GO TO 12.
    2. NG: Remove the foreign matter and clean the electric throttle control actuator inside.
    Fig 7: Locating Electric Throttle Control Actuator
    G00732571Courtesy of NISSAN MOTOR CO., U.S.A.
  12. CHECK THROTTLE CONTROL MOTOR 

    Refer to Component Inspection .

    OK or NG

    1. OK: GO TO 13.
    2. NG: GO TO  14.
  13. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    OK or NG

    1. OK: GO TO 14.
    2. NG: Repair or replace harness or connectors.
  14. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR 
    1. Replace the electric throttle control actuator.
    2. Perform Throttle Valve Closed Position Learning .
    3. Perform Idle Air Volume Learning .
      1. INSPECTION END 
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