Engine Will Not Crank or Cranks Slowly | Troubleshooting Cummins Diesel Engines

Cause	Correction
Engine Drive Units Engaged	Disengage driven units and Check for loading from malfunctioning accessories.
OK
Crankshaft Rotation Restricted	Rotate the crankshaft to Check for rotational Resistance.
OK
Starting Circuit Connections Loose or Corroded	Check and tighten Connections.
OK
Battery Charge Low	Check battery voltage.
OK
No Voltage to Starter Solenoid	Check voltage to Solenoid.
OK
Solenoid or Starting Motor Malfunction	Replace Starting Motor.
OK
Starting Motor Operating But Not Cranking the Engine	Remove the Starting Motor and check for Broken teeth on the Flywheel or broken Starting motor spring.

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