TEST ACTION APPLICABILITY
2 NOTE: If the vehicle is running rough at idle (DRBIIIt 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?
All
Yes → Go To 3
No → Go To 7
3 Turn the ignition off.
Disconnect the EGR Solenoid Assembly harness connector.
Start engine. Attempt to allow the engine to idle.
Does the engine run rough or stall?
All
Yes → Inspect the EGR tube assembly. If OK, replace the EGR valve.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 4
4 Inspect the EGR Assembly for the following.
Gasket(s) for leaking
Damage and/or holes in the EGR tube(s)
Carbon build up on or near the EGR pintle and passage ways.
Obstruction in the EGR tubes
Were any problem found?
All
Yes → Repair or replace the EGR Assembly as necessary.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 5
5 Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Turn the ignition on.
Measure the voltage on the EGR Solenoid Control circuit in the EGR Solenoid
connector.
Is the voltage above 1.0 volt?
All
Yes → Repair the short to voltage in the EGR solenoid control circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 6
6 NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
144
DRIVEABILITY - NGC
P0401 - EGR SYSTEM PERFORMANCE — Continued
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