2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Malfunction code No. 71

  1. INSPECTION START

    ABS actuator and electric unit power supply and ground circuit inspection

    Fig 1: ABS Actuator, Electric Unit Power Supply And Ground Circuit Inspection
    G00850671Courtesy of NISSAN MOTOR CO., U.S.A.
    1. : GO TO 2.
  2. CHECK CONNECTOR
    1. Disconnect ABS actuator and electric unit connector.

      Check terminals for damage or loose connection. Then reconnect connector.

    2. Carry out self-diagnosis again.

    Does warning lamp activate again? 

    1. Yes: GO TO 3.
    2. No: INSPECTION END 
  3. CHECK ABS ACTUATOR AND ELECTRIC UNIT POWER SUPPLY CIRCUIT

    Check voltage. Refer to , "DIAGNOSTIC PROCEDURE ".

    Does battery voltage exist when ignition switch is turned ON? 

    1. Yes: GO TO 4.
    2. No: Check the following.
      • Harness for open or short between ABS actuator and electric unit and fuse
  4. CHECK WARNING LAMP INDICATION

    Does warning lamp indicate code No. 71 again?

    Yes or No 

    1. Yes: Replace ABS actuator and electric unit. Refer to , "ACTUATOR ".
    2. No: Inspect the system according to the code No.
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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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