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Diagnostic trouble code: P0506 “Idle speed lower than nominal idle speed” Item No. Operation procedure Inspection results Follow-up procedure 1 Connect the diagnostic tester and adaptor,
Proceed to next step. Yes Proceed to next step. 2 Verify that the adjusting screw of throttle, No Carry out Overhaul. Yes Proceed to next step. 3 Verify that the working condition of idle No Carry out Overhaul. Yes Carry out Overhaul. 4 A. Verify that there is under pressure in the No Refer to diagnosis help.
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