CM850 Electronic Control System – Engine Will Not Shut Off

Symptom Tree  t081

This is symptom tree t081
Cause Correction

Keyswitch circuit is malfunctioning

Check the vehicle keyswitch circuit. Refer to Procedure 019-064.


Engine is running on fumes drawn into the air intake

Check the air intake ducts. Locate and isolate the source of the fumes. Repair as necessary. Refer to the OEM service manual.


Turbocharger oil seal is leaking

Check the turbocharger compressor and turbine seals. Refer to Procedure 010-033 in the Troubleshooting and Repair Manual, ISC, QSC8.3, ISL and QSL9 Engines, Bulletin 4021418.

Last Modified:  19-Dec-2003