Chrysler PT Cruiser 2001 Service Manual Supplement page 2576

DRIVEABILITY - GAS
P0401 - EGR SYSTEM FAILURE —
TEST
3 Turn ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Were any problems found?
Yes → Repair wiring harness/connectors as necessary.
→ Test Complete.
No
4 Turn the ignition on.
Turn all accessories off.
Disconnect the EGR solenoid harness connector.
Using a 12-volt Test Light connected to the ASD relay out ckt, probe the EGR solenoid
control circuit.
With the DRB, actuate the EGR solenoid.
Does the 12 volt test light flash on and off?
Yes → Replace the EGR valve.
→ Go To 5
No
5 Turn the igntion off.
Disconnect the EGR solenoid harness connector.
Turn the ignition on.
With the DRB, actuate the ASD Relay.
Using a 12-volt Test Light connected to ground, probe the ASD relay output circuit at
the EGR solenoid harness connector.
Does the 12 volt test light illuminate?
Yes → Go To 6
→ Repair the open in the ASD Realy output circuit.
No
6 Turn the ignition off.
Disconnect the EGR solenoid harness connector.
Turn the ignition on.
Measure the voltage of the EGR solenoid control circuit in the EGR solenoid
connector.
Is the voltage above 4.9 volts.
Yes → Repair the short to voltage in the EGR solenoid control circuit.
→ Go To 7
No
7 Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the EGR solenoid harness connector.
Measure the resistance of the EGR solenoid control circuit between the PCM
connector and the EGR solenoid connector.
Is the resistance below 5.0 ohms?
Yes → Go To 8
→ Repair the open in the EGR solenoid control circuit.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 2.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
Continued
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APPLICABILITY
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