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Home >> Nissan-Datsun >> 2004 >> Altima Base, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Control System - 3.5L) >> DTC P1122: Electric Throttle Control Function >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten two engine ground screws. Refer to "GROUND INSPECTION ".

    OK or NG

    1. OK : GO TO 2.
    2. NG : Repair or replace ground connections.
      Fig 1: Checking Engine Ground Connections
      G02885707Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK THROTTLE CONTROL MOTOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 107 and ground. Refer to Wiring Diagram .

      Continuity should exist. 

    3. Also check harness for short to power.

    OK or NG

    1. OK : GO TO 3.
    2. NG : Repair open circuit or short to power in harness or connectors.
  3. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I 
    1. Reconnect harness connectors disconnected.
    2. Check voltage between ECM terminal 102 and ground under the following conditions with CONSULT-II or tester.
      IGNITION SWITCH POSITION AND ECM TERMINALS VOLTAGE

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

    OK or NG

    1. OK : GO TO  11.
    2. NG : GO TO 4.
      Fig 2: Checking Voltage Between ECM Terminal 102 And Ground
      G02885708Courtesy of NISSAN MOTOR CO., U.S.A.
  4. 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 E124.
    4. Check continuity between ECM terminal 102 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

    1. OK : GO TO  6.
    2. NG : GO TO 5.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E20, F32
    • 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.
  6. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-I 
    1. Reconnect all harness connectors disconnected.
    2. Turn ignition switch OFF.
    3. Check voltage between ECM terminal 26 and ground with CONSULT-11 or tester.

      Voltage: Battery voltage 

    OK or NG

    1. OK : GO TO  10.
    2. NG : GO TO 7.
      Fig 3: Checking Voltage Between ECM Terminal 26 And Ground
      G02885709Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-II 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E121.
    3. Check continuity between ECM terminal 26 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

    1. OK : GO TO  9.
    2. NG : GO TO 8.
  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E19, F33
    • 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.
  9. CHECK FUSE 
    1. Disconnect 10A fuse.
    2. Check 10A fuse for blown.

    OK or NG

    1. OK : GO TO 10.
    2. NG : Replace 10A fuse.
  10. 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) ".
    2. NG : Repair or replace harness or connectors.
  11. 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: Continuity Table
      G02885710Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 5: Identifying Electric Throttle Control Actuator (1 Of 2)
      G02885711Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Also check harness for short to ground and short to power.

    OK or NG

    1. OK : GO TO 12.
    2. NG : Repair open circuit or short to ground or short to power in harness or connectors.
  12. 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 13.
    2. NG : Remove the foreign matter and clean the electric throttle control actuator inside.
      Fig 6: Identifying Electric Throttle Control Actuator (2 Of 2)
      G02885712Courtesy of NISSAN MOTOR CO., U.S.A.
  13. CHECK THROTTLE CONTROL MOTOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG

    1. OK : GO TO 14.
    2. NG : GO TO  15.
  14. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG

    1. OK : GO TO 15.
    2. NG : Repair or replace harness or connectors.
  15. 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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