Chrysler Concorde 2004 Service Manual page 818

DRIVEABILITY - NGC
Symptom:
P0401 - EGR SYSTEM PERFORMANCE
When Monitored and Set Condition:
P0401 - EGR SYSTEM PERFORMANCE
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.
GOOD TRIP EQUAL TO ZERO
EGR VALVE OPEN AT IDLE
EGR VALVE ASSEMBLY INSPECTION
EGR SOLENOID ASSEMBLY
EGR SOLENOID GROUND CIRCUIT OPEN
EGR SOLENOID CONTROL CKT SHORT TO GND
EGR SOLENOID CONTROL CKT SHORTED TO VOLTAGE
EGR SOLENOID CONTROL CKT OPEN
PCM - EGR OPEN
PCM - EGR CLOSED
TEST
1 Turn the ignition on.
With the DRBIII , read DTCs and record the related Freeze Frame data.
Is the Good Trip displayed and equal to zero?
Yes → Go To 2
→ Refer to the INTERMITTENT CONDITION symptom in the
No
2 NOTE: If the vehicle is running rough at idle (DRBIII not actuating) follow
the yes path to continue.
Turn the ignition on.
Turn all accessories off.
Start the engine.
Allow the engine to reach normal operating temperature.
With the DRB, enter Engine System Test, then EGR System Test.
Actuate the FLOW function in the EGR System Test.
Did the engine run rough or stall?
Yes → Go To 3
→ Go To 7
No
POSSIBLE CAUSES
ACTION
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
160
APPLICABILITY
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All