DESCRIPTION:Exhaust Gas Recirculation (EGR) cooler performance monitor.

MONITORED PARAMETER:Intake manifold temperature sensor.

TYPICAL ENABLING CONDITIONS:1. Engine running greater than 5 minutes.2. EGR mass flow greater than .08.3. Intake manifold temperature less than 125°C (257°F).4. Engine speed 1200-2500 rpm.5. Engine torque 500-2500 N·m.6. Coolant temperature greater than 65°C (149°F).7. Ambient temperature less than 45°C (113°F) ambient.8. Coolant temperature greater than 65°C (149°F).9. Ambient temperature greater than -8°C (17.6°F) ambient.10. Barometric pressure greater than 755 mbar (10.95 psi).

MONITOR SEQUENCE:None

EXECUTION FREQUENCY:Always enabled

TYPICAL DURATION:30

DASH LAMPS:MIL

VERIFICATION:1. When ambient temperature less than 45°C (113°F).2. Start engine.3. Warm up such that coolant temperature greater than 65°C (149°F).4. Ensure ambient barometric pressure greater than 755 mbar (10.95 psi).

PROBABLE CAUSES:1. If there are any cooling system issues, repair those first.2. Intake manifold air temperature sensor.3. Intake manifold air temperature sensor connector/harness.4. EGR system leaks.5. Remove the EGR hot pipe, EGR crossover tube, and mixer pipe. If blockage found, replace the EGR Cooler.