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Home >> Nissan-Datsun >> 2002 >> Sentra SE-R, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1437 (Engine Control System) >> DTC P1122: Electric Throttle Control Function >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan 350Z. 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 three ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 1: Loosen & Retighten Three Ground Screws On The Body
      G02401793Courtesy 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 
    1. Check voltage between ECM terminal 3 and ground under the following conditions with CONSULT-II or tester.
    IGNITION SWITCH VOLTAGE

    Ignition switch Voltage
    OFF Approximately 0V
    ON Battery voltage (11 - 14V)
    Fig 2: ECM Connector Terminal 3 & Ground Voltage Test
    G02401794Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO  10.
    • 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 .
      • 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 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.
  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.
      • Voltage: Battery voltage 

    OK or NG

    • OK: GO TO  9.
    • NG: GO TO 6.
    Fig 3: ECM Connector Terminal 104 & Ground Voltage Test
    G02401795Courtesy 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 .

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

    OK or NG

    • OK: GO TO  8.
    • NG: GO TO 7.
  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E108, M15
    • Harness connectors M72, F102
    • 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.
  8. CHECK FUSE 
    1. Disconnect 15A fuse.
    2. Check 15A fuse for blown.

    OK or NG

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

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG

  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 4: Throttle Control Continuity Chart
      G02401796Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 5: Locating Electric Throttle Control Actuator
      G02401797Courtesy of NISSAN MOTOR CO., U.S.A.
    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.

    OK or NG

    • OK: GO TO 12.
    • NG: Remove the foreign matter and clean the electric throttle control actuator inside.
    Fig 6: Electric Throttle Control Actuator Inside
    G02401798Courtesy of NISSAN MOTOR CO., U.S.A.
  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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