6E1–171
X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
difference between the two values exceeds the ECM’s
internal limit, a Diagnostic Trouble Code P0401 will set.
DTC P0401 is a type A code.
NOTE: Several deceleration cycles will be necessary to
run a sufficient number of EGR flow tests to determine a
”pass” or ”fail” condition.
Action Taken When the DTC Sets
D
The Malfunction Indicator Lamp (MIL) will illuminate
the first time the fault is detected.
D
A history Diagnostic Trouble Code is stored.
D
A history Diagnostic Trouble Code will clear after 40
consecutive warm up cycles without a fault.
D
The MIL will turn OFF after three consecutive ignition
cycles in which the diagnostic runs without a fault.
Conditions for Clearing the DTC
D
The MIL will turn OFF after three consecutive ignition
cycles in which the diagnostic runs without a fault.
D
A history Diagnostic Trouble Code will clear after 40
consecutive warm up cycles without a fault.
D
Diagnostic Trouble Codes can be cleared by using the
Tech 2.
Diagnostic Aids
Check for the following conditions:
D
Poor connection or damaged harness – Inspect the
wiring harness for damage. If the harness appears to
be OK, observe the Actual EGR Position display on the
Tech 2 while moving connectors and wiring harnesses
related to the EGR valve. A change in the display will
indicate the location of the fault.
D
Ensure EGR valve is correctly mounted. See
On–Vehicle Service.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the Diagnostic Trouble Code to
be set occurs. This may assist in diagnosing the
condition.
NOTE: If the EGR valve shows signs of excessive heat,
check the exhaust system for blockage (possibly a
plugged catalytic converter) using the ”Restricted
Exhaust System Check.”