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Home › Nissan-Datsun › 2008 › 350Z 2D Convertible, Standard › Repair and Diagnosis › Engine Performance › Engine Control Systems › Engine Control System - DTCS P1217 To P2A03 › DTC P1233, P2101 Electric Throttle Control Function › Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 

    Models with FDC system, navigation system or telephone 

    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 1: Identifying Body Ground Screws (Models With FDC System)
      G04875171Courtesy of NISSAN MOTOR CO., U.S.A.

    Models without FDC system, navigation system and telephone 

    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 2: Identifying Body Ground Screws (Models Without FDC System)
      G04875172Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

  2. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I 

    Check voltage between ECM terminal 3 (bank 1), 52 (bank 2) and ground under the following conditions with CONSULT-III or tester.

    VOLTAGE SPECIFICATION

    Ignition switch Voltage
    OFF Approximately 0V
    ON Battery voltage (11 - 14V)

    OK or NG 

    OK: GO TO  12.

    NG: GO TO 3.

    Fig 3: Checking Voltage Between ECM Terminal 52 And Ground
    G04875355Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-I 
    1. Turn ignition switch OFF.
    2. Check voltage between ECM terminal 25 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  7.

    NG: GO TO 4.

    Fig 4: Checking Voltage Between ECM Terminal 25 And Ground
    G04875356Courtesy of NISSAN MOTOR CO., U.S.A.
  4. 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 25 and IPDM E/R terminal 47. Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

    OK or NG 

    OK: GO TO  7.

    NG: GO TO 5.

  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E10, F1
    • Harness for open or short between ECM and IPDM E/R

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

  6. CHECK FUSE 
    1. Disconnect 15A fuse.
    2. Check 15A fuse for blown.

    OK or NG 

    OK: GO TO  9.

    NG: Replace 15A fuse.

  7. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E8.
    3. Check continuity between ECM terminal 3 (bank 1), 52 (bank 2) and IPDM E/R terminal 42. Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

    OK or NG 

    OK: GO TO  9.

    NG: GO TO 8.

  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E12, F3
    • Harness for open or short between ECM and IPDM E/R

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

  9. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG 

    OK: Replace IPDM E/R. Refer to "IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) ".

    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.
      Fig 5: Identifying Electric Throttle Control Actuator
      G04875357Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between the following terminals. Refer to WIRING DIAGRAM .
      TERMINALS CONTINUITY REFERENCE

      Bank Electric throttle control actuator terminal ECM terminal Continuity
      1 1 2 Should exist
      4 Should not exist
      2 2 Should not exist
      4 Should exist
      2 1 49 Should not exist
      50 Should exist
      2 49 Should exist
      50 Should not exist
    5. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO 11.

    NG: Repair or replace.

  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.
      Fig 6: Identifying Throttle Valve
      G04875344Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 12.

    NG: Remove the foreign matter and clean the electric throttle control actuator inside.

  12. CHECK THROTTLE CONTROL MOTOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 13.

    NG: GO TO  14.

  13. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG 

    OK: GO TO 14.

    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 ".

      : INSPECTION END 

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