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Home >> Jeep >> 2005 >> Wrangler X, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 628 (Powertrain Diagnostic Procedures - DRIVEABILITY - NGC Symptoms & Diagnostic Tests (DTCS P0016 To P0563)) >> DRIVEABILITY - NGC - Diagnostic Tests >> P0401-EGR System Performance (Gas - NGC) >> When Monitored and Set Condition:

When Monitored and Set Condition:

WARNING: This page is about a different car, the 2004 Dodge Pickup and 2004 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

When Monitored: During engine decel, 26 to 4 MPH. Engine Coolant Temp greater than 70°C (158°F). Engine run time greater than 120 seconds.

Set Condition: The PCM monitors engine roughness. During decel, the EGR is opened and the PCM monitors engine then monitors engine roughness with the valve open. If an increase of engine roughness is not present, an error is detected. Two Trip Fault.

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