P042E

P042E-EXHAUST GAS RECIRCULATION CONTROL STUCK OPEN

For a complete wiring diagram Refer to Diagrams/Electrical.

Theory of Operation


During regeneration of the aftertreatment diesel particulate filter the EGR valve is commanded to be in the closed position. If the EGR valve is not closed then a temperature rise will occur at the EGR valve orifice. The ECM monitors the orifice temperature of the EGR valve and will set the fault if the temperature is above a calibrated threshold maximum value. The ECM will illuminate the MIL light immediately after the diagnostic runs and passes in four consecutive drive cycles.

- When Monitored:
This diagnostic runs when the vehicle speed is greater than 20 MPH and during a regeneration of the aftertreatment diesel particulate filter.

- Set Condition:
The ECM







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview


Diagnostic Test


1. OTHER DTC'S
Ignition on, engine not running.
With the scan tool, read DTC's.
Are any other DTC'S present?

Yes


- Repair all other DTC's First.


No


- Go To 2



2. P042E ACTIVE
With the scan tool, read DTC's.
Is P042E Active?

Yes


- Replace the EGR valve.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test


No


- Repair complete.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test