Chrysler PT Cruiser 2001 Service Manual Supplement page 2577

P0401 - EGR SYSTEM FAILURE —
TEST
8 If there are no possible causes remaining, view repair.
Repair
9 Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Start engine. Attempt to allow the engine to idle.
Does the engine run rough or stall?
Yes → Inspect the EGR valve for carbon build up and clean as necessary.
No
10 Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the EGR solenoid harness connector.
Measure the resistance of the EGR solenoid control circuit to engine ground at the
EGR solenoid connector.
Is the resistance below 5.0 ohms?
Yes → Repair the short to ground in the EGR solenoid control circuirt.
No
11 If there are no possible causes remaining, view repair.
Repair
ACTION
Replace the PCM.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
If OK, replace the EGR valve.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
→ Go To 10
Perform POWERTRAIN VERIFICATION TEST VER - 2.
→ Go To 11
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
DRIVEABILITY - GAS
Continued
117
APPLICABILITY
All
All
All
All