DESCRIPTION:Exhaust Gas Recirculation (EGR) cooler low efficiency.

MONITORED PARAMETER:Intake manifold and charge air cooler outlet temperature sensors.

TYPICAL ENABLING CONDITIONS:1. Coolant temperature greater than 70°C (158°F)2. Engine running greater than 5 minutes.

MONITOR SEQUENCE:None

EXECUTION FREQUENCY:Always enabled

TYPICAL DURATION:10

DASH LAMPS:1. MIL2. CEL

ENGINE REACTION:Derate 10%

VERIFICATION:1. Start engine.2. Warm up such that coolant temperature greater than 70°C (158°F).3. Run engine greater than 5 minutes.

NOTE: If there are any cooling system related issues, fix those first.

PROBABLE CAUSES:1. Intake manifold air temperature sensor.2. Intake manifold air temperature sensor connector/harness.3. EGR system leaks (Look for soot).4. Remove the EGR hot pipe, EGR crossover tube, and mixer pipe. If blockage found, replace the EGR Cooler.