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ISB/ISBe Series Engines – Engine Fan Does Not Operate or Operates Erratically

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Symptom Tree  t046

This is symptom tree
Cause Correction

Programmable parameters or selected features are not correct

Check the programmable parameters and the selected features with an electronic service tool. Set the parameters and features again if necessary. Refer to Procedure
019-078.

 

Manual fan ON/OFF switch and circuit is malfunctioning

Check the manual fan ON/OFF switch and circuit. Refer to Manual Fan ON/OFF Switch, Resistance Check, and Short Circuit to Ground Check in Procedure
019-045.
 

Air conditioner sensor or circuit is malfunctioning

Check the air conditioner sensor and circuit. Refer to Air Conditioner Pressure Switch, Resistance Check, and Short Circuit to Ground Check in Procedure
019-262.

 

Fan clutch actuator or circuit is malfunctioning

Check the fan clutch actuator circuit. Refer to Procedure
019-045.
 

Engine electrical ground is malfunctioning

Check engine ground to chassis and chassis ground to battery negative (-) post. Refer to the OEM service manual and Procedure
013-009 in the Troubleshooting and Repair Manual, ISB
e, ISB, and QSB (Common Rail Fuel System) Series Engines, Bulletin 4021271.
 
Last Modified:  09-Apr-2007
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