ISM, ISMe, and QSM11 – Engine Will Not Crank or Cranks Slowly (Electric Starter)

Symptom Tree  t078

This is symptom tree t078
Cause Correction

Battery voltage is low

Inspect the batteries and the unswitched battery supply circuit. Refer to Procedure 013-009, and Procedure 019-087 in the Troubleshooting and Repair Manual Electronic Control System ISM and QSM11 Engines, Bulletin
3666266 or the Troubleshooting and Repair Manual CM870 Electronic Control System ISM Engines, Bulletin


Battery cables or connections are loose, broken, or corroded (excessive resistance)

Check the battery cables and connections. Refer to Procedure


Engine-driven units are engaged

Disengage engine-driven units.


Lubricating oil temperature is below specificationProcedure

Install an oil pan heater, or drain the oil and fill the system with warm oil.


Lubricating oil does not meet specifications for operating conditions

Change the oil and filters. Refer to Procedure
007-013 or
007-025. Use the oil type recommended in Section V of the engine operation and maintenance manual.


Crankshaft rotation is impaired

Check the crankshaft for ease of rotation. Refer to Procedure


Battery capacity is below specification

Refer to Procedure
018-021 in Section V. Replace the batteries if necessary.


Battery cables are not the correct gauge or length

Replace the battery cables with larger gauge or shorter length cables. Refer to Procedure
018-021 in Section V.


Starting circuit component is malfunctioning

Check the starting circuit components. Refer to the OEM service manual.


Starting motor pinion or ring gear is damaged

Remove the starting motor, and inspect the gear. Refer to Procedure
013-020 in Section 13 and Procedure
016-005 in Section 19 and the OEM service manual.


Hydraulic lock in a cylinder

Remove the injectors and rotate the crankshaft. Look for the source of fluid in the cylinder. Refer to Procedures
006-026 and


Internal engine damage

Analyze the oil and inspect the filters to locate an area of probable damage. Refer to Procedure

Last Modified:  07-Oct-2009