Chart 4

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Unique Idle Concern: Slow Return to Idle, Fast Idle

Carry out the following preliminary checks:

External fuel source.
Power take off (PTO), auxiliary idle control, and charge protect devices engaged.

SYSTEM OR COMPONENT	REFERENCE (Engine Controls Pinpoint Test unless noted)
Fuel Quality	REFER to DIAGNOSTIC PROCEDURES , Sufficient Clean Fuel.
Exhaust Gas Recirculation (EGR) System	GO to PINPOINT TEST W .
PTO Engagement	GO to PINPOINT TEST AN .