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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECTION START 

    Turn ignition switch to START.

    Is any cylinder ignited? 

    Yes or No

    • Yes (With CONSULT-II): GO TO 2.
    • Yes (Without CONSULT-II): GO TO  3.
    • No: GO TO  7.
  2. CHECK OVERALL FUNCTION 

    With CONSULT-II 

    1. Start engine.
    2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-II.
      Fig 1: CONSULT-II Active Test
      G02474678Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Make sure that each circuit produces a momentary engine speed drop.

    OK or NG

    • OK: INSPECTION END 
    • NG: GO TO  7.
  3. CHECK FUNCTION OF INJECTOR-I 

    Without CONSULT-II 

    1. Stop engine.
    2. Disconnect harness connector F44, F101.
      Fig 2: Disconnecting Harness Connector
      G02474679Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch ON.
    4. Check voltage between harness connector F44 terminal 5 and ground with CONSULT-II or tester.
      Fig 3: Checking Voltage Between Harness Connector F44 Terminal 5 & Ground
      G02474680Courtesy of NISSAN MOTOR CO., U.S.A.
      • Voltage: Battery voltage 
    5. Turn ignition switch OFF.
    6. Disconnect ECM harness connector.
    7. Check harness continuity between harness connector F44 terminal and ECM terminal as follows.

      Refer to WIRING DIAGRAM .

      CYLINDER AND TERMINALS REFERENCE TABLE

      Cylinder Harness connector F44 terminal ECM terminal
      1 6 23
      3 2 22
      5 1 21
      • Continuity should exist. 
    8. 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 E8, F17
    • Fuse block (J/B) connector E30
    • 10A fuse
    • Harness for open or short between harness connector F44 and fuse
    • Harness for open or short between harness connector F44 and ECM
    • : 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 harness connector F101 as follows and then interrupt it. Listen to each injector operating sound.

    Fig 4: Checking Function Of Injector-II
    G02474682Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 5: Cylinder Terminals Reference Chart
    G02474681Courtesy of NISSAN MOTOR CO., U.S.A.
    • Operating sound should exist. 

    OK or NG

    • OK: GO TO 6.
    • NG: GO TO  7.
  6. CHECK FUNCTION OF INJECTOR-III 
    1. Reconnect all harness connector disconnected.
    2. Start engine.
    3. Listen to injectors No. 2, No. 4, No. 6 operating sound.
      • Clicking noise should exist. 
      Fig 6: Checking Function Of Injector-III
      G02474683Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: INSPECTION END 
    • NG: GO TO 7.
  7. CHECK INJECTOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect injector harness connector.
      Fig 7: Disconnecting Injector Harness Connector
      G02474684Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch ON.
    4. Check voltage between injector terminal 1 and ground with CONSULT-II or tester.
      Fig 8: Checking Voltage Between Injector Terminal 1 & Ground
      G02474685Courtesy of NISSAN MOTOR CO., U.S.A.
      • Voltage: Battery voltage 

    OK or NG

    • OK: GO TO  9.
    • NG: GO TO 8.
  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E8, F17
    • Harness connectors F44, F101
    • Fuse block (J/B) connector E30
    • 10A fuse
    • Harness for open or short between injector and fuse
    • : Repair harness or connectors.
  9. CHECK INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between injector terminal 2 and ECM terminals 21, 22, 23, 40, 41, 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  11.
    • NG: GO TO 10.
  10. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F101, F44
    • Harness for open or short between injector and ECM
    • : Repair open circuit or short to ground or short to power in harness or connectors.
  11. CHECK INJECTOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG

    • OK: GO TO 12.
    • NG: Replace injector.
  12. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    • : INSPECTION END 
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