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Home >> Chevrolet >> 2019 >> Sonic LS, Standard Trans >> Repair and Diagnosis >> Engine Mechanical >> Starter >> Battery, Starting System And Charging System >> Diagnostic Information and Procedures >> Engine Cranks Slowly >> Circuit/System Verification

Circuit/System Verification

  1. Ignition OFF, measure and record the battery voltage at the C1 battery terminals. The voltage should be between 12.0 - 15.0 V.
  2. Test for less than 0.5 V between the positive battery cable and terminal B X2 at the M64 starter motor as the ignition is placed to the CRANK position.
    • If greater than the specified value, replace the positive battery cable.
  3. Test for less than 0.5 V between the negative battery cable and the M64 starter motor case as the ignition switch is placed to the CRANK position.
    • If greater than the specified value, replace the negative battery cable.
  4. Remove the drive belts. Refer to:Drive Belt Replacement
  5. Place the ignition to the CRANK position. verify the engine does not crank normal.
    • If the engine cranks normal, inspect the engine and belt drive system for mechanical binding, seized generator etc.
  6. If all circuits test normal, replace the M64 starter motor.
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