2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure: Notes

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. INSPECTION START 

    Do you have CONSULT-II?

    Yes or No

    • Yes: GO TO 2.
    • No: GO TO  4.
  2. CHECK COOLING FAN LOW SPEED OPERATION 

    With CONSULT-II 

    1. Start engine and let it idle.
    2. Select "COOLING FAN" in "ACTIVE TEST" mode with CONSULT-II and touch "LOW" on the CONSULT-II screen.
    3. Make sure that cooling fans-1 and -2 operate at low speed.

    OK or NG

    • OK: GO TO 3.
    • NG: Check cooling fan low speed control circuit. (Go to "PROCEDURE A ".)
    Fig 1: Scan Tool Display "Active Test"
    G02401875Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK COOLING FAN HIGH SPEED OPERATION 

    With CONSULT-II 

    1. Touch "HIGH" on the CONSULT-II screen.
    2. Make sure that cooling fans-1 and -2 operate at higher speed than low speed.

    OK or NG

    • OK: GO TO  6.
    • NG: Check cooling fan high speed control circuit. (Go to "PROCEDURE B ".)
    Fig 2: Scan Tool Display "Active Test Cooling Fan"
    G02401876Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK COOLING FAN LOW SPEED OPERATION 

    Without CONSULT-II 

    1. Start engine and let it idle.
    2. Turn air conditioner switch ON.
    3. Turn blower fan switch ON.
    4. Make sure that cooling fans-1 and -2 operate at low speed.

    OK or NG

    • OK: GO TO 5.
    • NG: Check cooling fan low speed control circuit. (Go to "PROCEDURE A ".)
    Fig 3: Cooling Fan
    G02401877Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK COOLING FAN HIGH SPEED OPERATION 

    Without CONSULT-II 

    1. Turn ignition switch OFF.
    2. Turn air conditioner switch and blower fan switch OFF.
    3. Disconnect engine coolant temperature sensor harness connector.
    4. Connect 150Ω resistor to engine coolant temperature sensor harness connector.
    5. Restart engine and make sure that cooling fans-1 and -2 operate at higher speed than low speed.

    OK or NG

    • OK: GO TO 6.
    • NG: Check cooling fan high speed control circuit. (Go to "PROCEDURE B ".)
    Fig 4: Connect 150Ω Resistor To Engine Coolant Temperature Sensor Harness Connector
    G02401878Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK COOLING SYSTEM FOR LEAK 

    Apply pressure to the cooling system with a tester, and check if the pressure drops.

    • Testing pressure: 157 kPa (1.6 kg/cm 2  , 23 psi) 
    CAUTION: Higher than the specified pressure may cause radiator damage. Pressure should not drop. 
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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