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Home >> Nissan-Datsun >> 2004 >> Frontier Desert Runner SE >> Repair and Diagnosis >> Engine Performance >> Engine Control System - VG33E >> Basic Service Procedure >> Trouble Diagnosis >> Basic Inspection
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Basic Inspection

Precaution: 

Perform Basic Inspection without electrical or mechanical loads applied; 

  1. INSPECTION START 
    1. Check service records for any recent repairs that may indicate a related malfunction, or the current need for scheduled maintenance.
    2. Open engine hood and check the following:
      • Harness connectors for improper connections
      • Vacuum hoses for splits, kinks, or improper connections
      • Wiring for improper connections, pinches, or cuts
    1. Models with CONSULT-II: GO TO 2.
    2. Models with GST: GO TO 2.
    3. Models with No Tools: GO TO  15.
    Fig 1: Checking Vacuum Hoses For Splits, Kinks, Or Improper Connections
    G00742550Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CONNECT CONSULT-II OR GST TO THE VEHICLE 

    With CONSULT-II 

    Connect CONSULT-II to the data link connector for CONSULT-II and select "ENGINE" from the menu. Refer to "INSPECTION PROCEDURE ".

    With GST 

    Connect GST to the data link connector for GST.

    Refer to "INSPECTION PROCEDURE ".

    1. With CONSULT-II: GO TO 3.
    2. With GST: GO TO  14.
  3. CHECK FI CAM FUNCTION 

    With CONSULT-II 

    1. Turn ignition switch ON.
    2. Select "COOLAN TEMP/S" in "DATA MONITOR" mode with CONSULT-II.
    3. Start engine and warm it up.
      Fig 2: Reading "COOLAN TEMP/S" In "DATA MONITOR" Mode
      G00742551Courtesy of NISSAN MOTOR CO., U.S.A.
    4. When engine coolant temperature is 75 to 85°C (167 to 185°F), check the following.
      • The center of mark A  is aligned with mark C. 
      • The cam follower lever's roller is not touching the fast idle cam.

    OK or NG 

    1. OK : GO TO 4.
    2. NG :
      1. Check FI cam. Refer to "FAST IDLE CAM (FIC) INSPECTION AND ADJUSTMENT ".
      2. GO TO 4.
    Fig 3: Identifying Center Marks And Thermo-Element
    G00742552Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK IGNITION TIMING 

    With CONSULT-II 

    1. Warm up engine to normal operating temperature.
    2. Select "IGNITION TIMING ADJ" in "WORK SUPPORT" mode and touch "START".
      Fig 4: Reading "IGNITION TIMING ADJ" In "WORK SUPPORT" Mode
      G00742553Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check ignition timing at idle using a timing light.
      1. M/T: 10+/-5° BTDC (in Neutral position) 
      2. A/T: 10+/-5° BTDC (in P or N position) 
      4. Fig 5: Checking Ignition Timing
      G00742554Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK : GO TO 5.
    2. NG :
      1. Adjust ignition timing by turning distributor. Refer to "IDLE SPEED/IGNITION TIMING/IDLE MIXTURE RATIO ADJUSTMENT ".
      2. GO TO 5.
  5. CHECK BASE IDLE SPEED 

    With CONSULT-II 

    1. Select "IGNITION TIMING ADJ" in "WORK SUPPORT" mode and touch "START".
    2. Check idle speed.
      1. M/T: 700+/-50 RPM (in Neutral position) 
      2. A/T: 700+/-50 RPM (in P or N position) 

    OK or NG 

    1. OK : GO TO 6.
    2. NG :
      1. Adjust engine speed by turning idle speed adjusting screw. Refer to "IDLE SPEED/IGNITION TIMING/IDLE MIXTURE RATIO ADJUSTMENT ".
      2. GO TO 6.
      Fig 6: Adjusting Idle Speed
      G00742555Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK CLOSED THROTTLE POSITION SWITCH IDLE POSITION-I 

    With CONSULT-II 

    NOTE: Always check ignition timing and base idle speed before performing the following.
    1. Warm up engine to normal operating temperature.
    2. Check FI cam, refer to step  3.
    3. Stop engine.
      1. : GO TO 7.
  7. CHECK CLOSED THROTTLE POSITION SWITCH IDLE POSITION-II 
    1. Turn ignition switch ON.
    2. Select "TP SW/TP SEND IDLE POSI ADJ" in "WORK SUPPORT" mode.
    3. Read "CLSD THL/P SW" signal under the following conditions.
      • Insert a 0.3 mm (0.012 in) and 0.4 mm (0.016 in) feeler gauge alternately between the throttle adjust screw (TAS) and throttle drum as shown in the figure and check the signal.
    Fig 7: Inserting Feeler Gauge
    G00742556Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 8: Reading "CLSD THL/P SW" In "DATA MONITOR" Mode
    G00742557Courtesy of NISSAN MOTOR CO., U.S.A.
    1. "CLSD THL/P SW" signal should remain "ON" while inserting 0.3 mm (0.012 in) feeler gauge. 
    2. "CLSD THL/P SW" signal should remain "OFF" while inserting 0.4 mm (0.016 in) feeler gauge. 

    OK or NG 

    1. OK : GO TO  12.
    2. NG : GO TO 8.
  8. ADJUSTMENT THROTTLE POSITION SWITCH IDLE POSITION 

    With CONSULT-II 

    NOTE:
    • Never adjust throttle adjust screw (TAS).
    • Do not touch throttle drum when checking "CLSD THL/P SW" signal, doing so may cause an incorrect adjustment.
    1. Warm up engine to normal operating temperature.
    2. Check FI cam. Refer to  3.
    3. Stop engine.
    4. Loosen throttle position sensor fixing bolts.
      1. : GO TO 9.
  9. ADJUSTMENT CLOSED THROTTLE POSITION SWITCH IDLE POSITION-II 
    1. Turn ignition switch ON.
    2. Select "TP SW/TP SEN IDLE POSI ADJ" in "WORK SUPPORT" mode.
    3. Insert 0.35 mm (0.0138 in) feeler gauge between throttle adjust screw and throttle drum as shown in the figure.
    4. Open throttle valve and then close.
      Fig 9: Inserting Feeler Gauge
      G00742558Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Check "CLSD THL/P SW" signal.
      1. "CLSD THL/P SW" signal should remain "OFF" when the throttle valve is closed  .

    OK or NG 

    1. OK : GO TO  11.
    2. NG : GO TO 10.
    Fig 10: Reading "CLSD THL/P SW" In "DATA MONITOR" Mode
    G00742559Courtesy of NISSAN MOTOR CO., U.S.A.
  10. ADJUSTMENT THROTTLE POSITION SWITCH IDLE POSITION-III 

    With CONSULT-II 

    Turn throttle position sensor body counterclockwise until "CLSD THL/P SW" signal switches to "OFF".

    1. : GO TO 11.
    Fig 11: Adjusting Throttle Position Switch
    G00742560Courtesy of NISSAN MOTOR CO., U.S.A.
  11. ADJUSTMENT THROTTLE POSITION SWITCH IDLE POSITION-IV 

    With CONSULT-II 

    1. Remove 0.35 mm (0.0138 in) feeler gauge then insert 0.3 mm (0.012 in) feeler gauge.
    2. Temporarily tighten sensor body fixing bolts as follows.
      • Gradually move the sensor body clockwise and stop it when "CLSD THL/P SW" signal switches from "OFF" to "ON", then temporarily tighten sensor body fixing bolts  .
    3. Make sure two or three times that the signal is "ON" when the throttle valve is closed and "OFF" when it is opened.
    4. Remove 0.3 mm (0.012 in) feeler gauge then insert 0.4 mm (0.016 in) feeler gauge.
    5. Make sure two or three times that the signal remains "OFF" when the throttle valve is closed.
    6. Tighten throttle position sensor.
    7. Check the "CLSD THL/P SW" signal again.
      1. The signal remains "OFF" while closing throttle valve. 

    OK or NG 

    Fig 12: Adjusting Throttle Position Switch
    G00742561Courtesy of NISSAN MOTOR CO., U.S.A.
    1. OK : GO TO 12.
    2. NG : GO TO  8.
  12. RESET THROTTLE POSITION SENSOR IDLE POSITION MEMORY 

    With CONSULT-II 

    NOTE: Always warm up engine to normal operating temperature. If engine is cool, the throttle position sensor idle position memory will not be reset correctly.
    1. Remove feeler gauge.
    2. Start engine.
    3. Warm up engine to normal operating temperature.
    4. Select "TP SW/TP SEN IDLE POSI ADJ" in "WORK SUPPORT" mode.
    5. Stop engine. (Turn ignition switch OFF.)
    6. Turn ignition switch ON and wait at least 5 seconds.
    7. Turn ignition switch OFF and wait at least 5 seconds.
      Fig 13: Warming Up Engine To Normal Operating Temperature
      G00742562Courtesy of NISSAN MOTOR CO., U.S.A.
    8. Repeat steps 5 and 6 until "CLSD THL POS" signal changes to "ON".
      Fig 14: Reading "CLSD THL POS" In "DATA MONITOR" Mode
      G00742563Courtesy of NISSAN MOTOR CO., U.S.A.
    1. : GO TO 13.
  13. CHECK TARGET IDLE SPEED 

    With CONSULT-II 

    1. Start engine and warm it up to normal operating temperature.
    2. Select "ENG SPEED" in "DATA MONITOR" mode.
    3. Check idle speed.
      1. M/T: 750+/-50 RPM (in Neutral position) 
      2. A/T: 750+/-50 RPM (in P or N position) 

    OK or NG 

    1. OK : INSPECTION END 
    2. NG :
      1. Adjust idle speed. Refer to "IDLE SPEED/IGNITION TIMING/IDLE MIXTURE RATIO ADJUSTMENT ".
      2. GO TO  27.
    Fig 15: Reading "ENG SPEED" in "DATA MONITOR" Mode
    G00742564Courtesy of NISSAN MOTOR CO., U.S.A.
  14. CHECK FI CAM FUNCTION 

    With GST 

    1. Turn ignition switch ON.
    2. Select MODE 1 with GST.
    3. Start engine and warm it up.
    4. When engine coolant temperature is 75 to 85°C (167 to 185°F), check the following.
      • The center of mark A  is aligned with mark C  .
      • The cam follower lever's roller is not touching the fast idle cam.

    OK or NG 

    1. OK : GO TO  16.
    2. NG :
      1. Check FI cam. Refer to "FAST IDLE CAM (FIC) INSPECTION AND ADJUSTMENT ".
      2. GO TO  16.
    Fig 16: Checking FI Cam
    G00742565Courtesy of NISSAN MOTOR CO., U.S.A.
  15. CHECK FI CAM FUNCTION 

    No Tools 

    1. Set the voltmeter between ECM terminal 59 (Engine coolant temperature sensor signal) and engine ground.
      2. Fig 17: Checking Voltage Between ECM Terminal 59 And Engine Ground
      G00742566Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Start engine and warm it up.
    3. When the voltage is between 1.10 to 1.36V, check the following.
      • The center of mark A  is aligned with mark C  .
      • The cam follower lever's roller is not touching the fast idle cam.

    OK or NG 

    1. OK : GO TO 16.
    2. NG :
      1. Check FI cam. Refer to "FAST IDLE CAM (FIC) INSPECTION AND ADJUSTMENT ".
      2. GO TO 16.
    Fig 18: Checking FI Cam
    G00742567Courtesy of NISSAN MOTOR CO., U.S.A.
  16. CHECK IGNITION TIMING 

    Without CONSULT-II 

    1. Warm up engine to normal operating temperature.
    2. Stop engine and disconnect throttle position sensor harness connector.
    3. Start engine.
      Fig 19: Locating Throttle Position Sensor Harness Connector
      G00742568Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check ignition timing at idle using a timing light.
      1. M/T: 10+/-5° BTDC (in Neutral position) 
      2. A/T: 10+/-5° BTDC (in Neutral position) 

    OK or NG 

    1. OK : GO TO 17.
    2. NG :
      1. Adjust ignition timing by turning distributor. Refer to "IDLE SPEED/IGNITION TIMING/IDLE MIXTURE RATIO ADJUSTMENT ".
      2. GO TO 17.
    Fig 20: Checking Ignition Timing
    G00742569Courtesy of NISSAN MOTOR CO., U.S.A.
  17. CHECK BASE IDLE SPEED 

    Without CONSULT-II 

    1. Make sure that throttle position sensor harness connector remain disconnected.
    2. Does engine speed fall to the following speed?
      1. M/T: 700+/-50 RPM (in Neutral position) 
      2. A/T: 700+/-50 RPM (in P or N position) 

    OK or NG 

    1. OK : GO TO 18.
    2. NG :
      1. Adjust engine speed by turning idle speed adjusting screw. Refer to "IDLE SPEED/IGNITION TIMING/IDLE MIXTURE RATIO ADJUSTMENT ".
      2. GO TO 18.
  18. CHECK CLOSED THROTTLE POSITION SWITCH IDLE POSITION 

    Without CONSULT-II 

    NOTE: Always check ignition timing and base idle speed before performing the following.
    1. Warm up engine to normal operating temperature.
    2. Check FI cam, refer to  14 or  15.
    3. Stop engine.
    1. : GO TO 19.
  19. CHECK CLOSED THROTTLE POSITION SWITCH IDLE POSITION-I 
    1. Disconnect closed throttle position switch harness connector.
    2. Check continuity between closed throttle position switch terminals 5 and 6 under the following conditions.
    Fig 21: Checking Continuity Between Closed Throttle Position Switch Terminals 5 And 6
    G00742570Courtesy of NISSAN MOTOR CO., U.S.A.
    • Insert the 0.3 mm (0.012 in) and 0.4 mm (0.016 in) feeler gauge alternately between the throttle adjust screw (TAS) and throttle drum as shown in the figure.
      1. Continuity should exist while inserting 0.3 mm (0.012 in) feeler gauge. 
      2. Continuity should not exist while inserting 0.4 mm (0.016 in) feeler gauge. 

    OK or NG 

    1. OK : GO TO  24.
    2. NG : GO TO 20.
    Fig 22: Inserting Feeler Gauge
    G00742571Courtesy of NISSAN MOTOR CO., U.S.A.
  20. ADJUSTMENT THROTTLE POSITION SWITCH IDLE POSITION 

    Without CONSULT-II 

    NOTE:
    • Never adjust throttle adjust screw (TAS).
    • Do not touch throttle drum when checking continuity, doing so may cause an incorrect adjustment.
    1. Warm up engine to normal operating temperature.
    2. Check FI cam. Refer to  14 or  15.
    3. Stop engine.
    4. Loosen throttle position sensor fixing bolts.
    1. : GO TO 21.
  21. ADJUSTMENT CLOSED THROTTLE POSITION SWITCH IDLE POSITION-II 
    1. Disconnect closed throttle position switch harness connector.
    2. Insert 0.35 mm (0.0138 in) feeler gauge between the throttle adjust screw and throttle drum as shown in the figure.
    3. Open throttle valve then close.
      Fig 23: Inserting Feeler Gauge
      G00742572Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between closed throttle position switch terminals 5 and 6.
      1. Continuity should not exist while closing the throttle position sensor. 

    OK or NG 

    1. OK : GO TO  23.
    2. NG : GO TO 22.
    Fig 24: Checking Continuity Between Closed Throttle Position Switch Terminals 5 And 6
    G00742573Courtesy of NISSAN MOTOR CO., U.S.A.
  22. ADJUSTMENT THROTTLE POSITION SWITCH IDLE POSITION-III 

    Without CONSULT-II 

    Turn throttle position sensor body counterclockwise until continuity does not exist.

    1. : GO TO 23.
    Fig 25: Adjusting Throttle Position Switch
    G00742574Courtesy of NISSAN MOTOR CO., U.S.A.
  23. ADJUSTMENT THROTTLE POSITION SWITCH IDLE POSITION-IV 

    Without CONSULT-II 

    1. Remove 0.35 mm (0.0138 in) feeler gauge then insert 0.3 mm (0.012 in) feeler gauge.
    2. Temporarily tighten sensor body fixing bolts as follows.
      • Gradually move the sensor body clockwise and stop it when the continuity comes to exist, then temporarily tighten sensor body fixing bolts. 
      Fig 26: Adjusting Throttle Position Switch
      G00742575Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Make sure two or three times that the continuity exists when the throttle valve is closed and continuity does not exist when it is opened.
    4. Remove 0.3 mm (0.012 in) feeler gauge then insert 0.4 mm (0.016 in) feeler gauge.
    5. Make sure two or three times that the continuity does not exist when the throttle valve is closed.
    6. Tighten throttle position sensor.
    7. Check the continuity again.
    1. Continuity does not exist while closing the throttle valve. 

    OK or NG 

    1. OK : GO TO 24.
    2. NG : GO TO  20.
  24. RESET THROTTLE POSITION SENSOR IDLE POSITION MEMORY 

    Without CONSULT-II 

    NOTE: Always warm up engine to normal operating temperature. If engine is cool, the throttle position sensor idle position memory will not be reset correctly.
    1. Remove feeler gauge.
    2. Start engine.
    3. Warm up engine to normal operating temperature.
    4. Stop engine. (Turn ignition switch OFF.)
    5. Turn ignition switch ON and wait at least 5 seconds.
    6. Turn ignition switch OFF and wait at least 5 seconds.
    7. Repeat steps 4 and 5 for 20 times.
    1. : GO TO 25.
    Fig 27: Warming Engine To Operating Temperature
    G00742576Courtesy of NISSAN MOTOR CO., U.S.A.
  25. REINSTALLATION 

    Without CONSULT-II 

    1. Reconnect throttle position sensor harness connector and closed throttle position switch harness connector.
    2. Start engine and rev it (2, 000 to 3, 000 RPM) two or three times under no load and then run engine at idle speed.
    1. : GO TO 26.
  26. CHECK TARGET IDLE SPEED 

    Without CONSULT-II 

    1. Start engine and warm it up to normal operating temperature.
    2. Check idle speed.
      1. M/T: 750+/-50 RPM (in Neutral position) 
      2. A/T: 750+/-50 RPM (in P or N position) 

    OK or NG 

    1. OK : GO TO 27.
    2. NG :
      1. Adjust idle speed. Refer to "IDLE SPEED/IGNITION TIMING/IDLE MIXTURE RATIO ADJUSTMENT ".
      2. GO TO 27.
  27. ERASE UNNECESSARY DTC 

    After this inspection, unnecessary DTC No. might be displayed.

    Erase the stored memory in ECM and TCM (Transmission control module).

    Refer to "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION " and HOW TO ERASE DTC .

    1. : INSPECTION END 
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