DTC 2-4-1 EGR System Flow Fault

2-4-1 EGR SYSTEM, FLOW ERROR

Condition(s) for DTC
^ Engine hot (temperature above 65°C / 150°F) and running at part load with EGR signal unchanged.
^ The EGR temperature sensor signal should vary when the ICM transmits a control signal to the EGR controller. Absence of variation is interpreted as a flow error and the DTC is recorded.

Substitute value
^ None.

Fault source(s)
^ Open-circuit in signal lead.
^ No supply to EGR controller.
^ Faulty EGR controller.
^ Faulty vacuum hoses.
^ Faulty EGR valve (valve not opening).

Fault symptom(s)
^ None.


NOTE: Take care when removing the yellow and white hoses. Grip and twist hose rubber connector ends only, not the plastic hose itself. The hoses may break or crack if pulled from their connections.