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Home >> Infiniti >> 2005 >> FX45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System - VK45DE >> Injector Circuit >> Diagnostic Procedure
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Diagnostic Procedure

  1. INSPECTION START 

    Turn ignition switch to START.

    Is any cylinder ignited? 

    Yes or No

    1. Yes (With CONSULT-II): GO TO 2.
    2. Yes (Without CONSULT-II): GO TO  3 .
    3. No: GO TO  3 .
  2. CHECK OVERALL FUNCTION 

    WITH CONSULT-II 

    1. Start engine.
    2. Perform " " in "ACTIVE TEST" mode with CONSULT-II.
    3. Make sure that each circuit produces a momentary engine speed drop.

    OK or NG

    1. OK: INSPECTION END 
    2. NG: GO TO 3.
    Fig 1: Checking Overall Function
    G02358884Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK FUNCTION OF INJECTOR-I 
    1. Turn ignition switch OFF.
    2. Disconnect harness connector F21, F201 (bank 1) and F41, F221 (bank 2).
      Fig 2: Disconnecting Harness Connector F21, F201 And F41, F221
      G02358885Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch ON.
    4. Check voltage between the following; harness connector F21 terminal 5 and ground, harness connector F41 terminal 5 and ground with CONSULT-II or tester.
      1. Voltage: Battery voltage 
    5. Turn ignition switch OFF.
    6. Disconnect ECM harness connector.
      Fig 3: Disconnecting ECM Harness Connector
      G02358886Courtesy of NISSAN MOTOR CO., U.S.A.
    7. Check harness continuity between the following terminals.
      CONTINUITY SPECIFICATIONS

      Cylinder Harness connector terminal ECM terminal
      1 F21 terminal 3 23
      3 F21 terminal 2 22
      5 F21 terminal 1 21
      7 F21 terminal 6 44
      2 F41 terminal 3 42
      4 F41 terminal 2 41
      6 F41 terminal 1 40
      8 F41 terminal 6 63
      1. Continuity should exist. 
    8. 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 M82, F102
    • Harness connectors F21, F201
    • Harness connectors F41, F221
    • Fuse block (J/B) connector M1
    • 15A fuse
    • Harness for open or short between harness connector F21 and fuse
    • Harness for open or short between harness connector F41 and fuse
    • Harness for open or short between harness connector F21 and ECM
    • Harness for open or short between harness connector F41 and ECM
      1. : Repair open circuit or short to ground or short to power in harness or connectors.
  5. CHECK FUNCTION OF INJECTOR-II 

    Provide battery voltage between the following terminals, and then interrupt it. Listen to each injector operating sound.

    Fig 4: Voltage Specifications Voltage
    G02358887Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 5: Check Function Of Injector-II
    G02358888Courtesy of NISSAN MOTOR CO., U.S.A.
    1. Operating sound should exist. 

    OK or NG

    1. OK: INSPECTION END 
    2. NG: GO TO 6.
  6. CHECK SUB-HARNESS CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect injector harness connectors.
      Fig 6: Disconnecting Injector Harness Connectors
      G02358889Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check harness continuity between the following terminals. Refer to WIRING DIAGRAM  .
      Fig 7: Continuity Specifications
      G02358890Courtesy of NISSAN MOTOR CO., U.S.A.
      1. Continuity should exist. 
    3. Also check harness for short to ground and short to power.

    OK or NG

    1. OK: GO TO 7.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  7. CHECK INJECTOR 

    Refer to "COMPONENT INSPECTION  ".

    OK or NG

    1. OK: GO TO 8.
    2. NG: Replace injector.
  8. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  ".

    1. : INSPECTION END 
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