DESCRIPTION:Exhaust Gas Recirculation (EGR) Actuator Slow Response.

MONITORED PARAMETER:EGR Mass Flow Gradient.

TYPICAL ENABLING CONDITIONS:1. EGR in Closed-Loop Control.2. EGR Flow Must Vary, CAC Outlet Temperature greater than 0°C (32°F).3. Engine Speed 1200 to 2500 rpm, Engine Torque 500 to 2500 N·m.4. Coolant Temperature greater than 65°C (149°F).5. Ambient Temperature Greater Than -8°C (17.6°F) Ambient.6. Barometric Pressure Greater Than 755 mbar.7. Engine must have not been in regeneration mode for greater than Five minutes.

MONITOR SEQUENCE:None

EXECUTION FREQUENCY:Always Enabled

TYPICAL DURATION:Five Seconds

DASH LAMPS:MIL

ENGINE REACTION:None

VERIFICATION:1. When ambient temperature greater than -8°C (17.6°F).2. Barometric pressure greater than 755 mbar.3. Engine has not been in regeneration mode for greater than five minutes.4. Warm up engine such that coolant temperature greater than 65°C (149°F).5. Run vehicle.6. Varying throttle to vary EGR flow.7. Insuring engine is operating in closed-loop EGR control and CAC outlet temperature greater than 0°C (32°F).

PROBABLE CAUSES:1. If any voltage codes exist, fix those first.2. EGR valve actuator pull rod.3. EGR actuator.4. EGR valve.5. Wiring between the EGR actuator harness and the ECM.