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HOMESERVICE MANUALSSUBARU2014IMPREZA SPORT LIMITEDREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALCHARGING SYSTEMSSTARTING SYSTEM / CHARGING SYSTEM (EXCEPT HYBRID)STARTERINSPECTIONARMATURE
2014 Subaru Impreza Sport Limited

Starting System / Charging System (Except Hybrid): Starter: Inspection: Armature

2014 Subaru Impreza Sport LimitedSECTION Armature
  1. Check the commutator for signs of seizure or stepped wear caused by roughness of the surface. If there is light wear, use sandpaper to repair.
  2. Check for runout on the commutator. If excessive, replace the armature.

    Commutator runout: 

    Standard 

    0.05 mm (0.0020 in) 

    Limit 

    0.10 mm (0.0039 in) 

    Fig 1: Checking For Runout On Commutator Using Dial Gauge
    G09486991Courtesy of SUBARU OF AMERICA, INC.
  3. Check the depth of the segment mold. If it is not within the standard, replace the armature.

    Depth of segment mold: 

    Standard 

    0.50 mm (0.020 in) 

    Fig 2: Identifying Depth Of Segment Mold
    G09486992Courtesy of SUBARU OF AMERICA, INC.
  4. Place the armature on the growler tester to check for short circuits. While slowly turning the armature, support the steel sheet for the armature core. If the circuit of the armature is shorted, the steel sheet will vibrate, causing it to move towards the core. When the steel sheet has moved or vibrated, replace the armature.
    Fig 3: Checking Armature For Short Circuits
    G09486993Courtesy of SUBARU OF AMERICA, INC.
  5. Use a circuit tester to touch the probe of one side to the commutator segment, and the other probe to the shaft. If there is continuity, replace the armature.
    Fig 4: Checking Armature Continuity Using Circuit Tester
    G07665149Courtesy of SUBARU OF AMERICA, INC.
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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.