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Home >> Chevrolet >> 2021 >> Malibu L >> Repair and Diagnosis >> Electrical >> Starter >> 12 V Starting And Charging - Diagnostic Information And Procedures (2 Of 2) >> 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.
  2. Verify the measured voltage is between 12.0 - 15.0 V.
    • Go to next step: If voltage is between 12.0 - 15.0 V 
  3. Verify that a test lamp illuminates between the M64 Starter Motor B+ terminal A X2 or 1 X2 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for greater than 100 Ω between the B+ circuit and ground.
      • If 100 Ω or less, repair the short to ground on the circuit.
      • If greater than 100 Ω, replace the M64 Starter Motor.
    • Go to next step: If the test lamp illuminates 
  4. Test for less than 0.5 V between the positive battery cable and terminal A X2 or 1 X2 at the M64 Starter Motor with the ignition in the START position.
    • If 0.5 V or greater 

      Replace the positive battery cable.

    • Go to next step: If less than 0.5 V 
  5. Test for less than 0.5 V between the negative battery cable and the M64 Starter Motor case with the ignition in the START position.
    • If 0.5 V or greater 

      Replace the negative battery cable.

    • Go to next step: less than 0.5 V 
  6. Remove the drive belts. Refer to Drive Belt Tensioner Replacement , for the 1.5 L engine or Drive Belt Replacement , or Drive Belt Tensioner Replacement for the 2.0 L engine.
  7. Verify the crankshaft rotates rotate the crankshaft by hand using the appropriate tools.
    • Go to next step: If the crankshaft rotates 
  8. Verify the engine does not crank when attempting to start the vehicle.
    • If the engine cranks 

      Inspect the engine and belt drive system for mechanical binding, seized generator etc.

    • Go to next step: If the engine does not crank 
  9. Replace the M64 Starter Motor.
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