Chrysler PT Cruiser 2001 Service Manual Supplement page 2552

DRIVEABILITY - GAS
P0172-1/1 FUEL SYSTEM RICH —
TEST
2 Turn the ignition off.
Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose, fitting or line, the fuel
system pressure must be released.
Install a fuel pressure gauge.
Turn the ignition on.
With the DRB, actuate the ASD Fuel System test and observe the fuel pressure
gauge.
Note: Fuel pressure specification is 400 KPa +/- 34 KPa (58 psi +/- 5 psi).
Choose a conclusion that best matches your fuel pressure reading.
Below Specification
Within Specification
Above Specification
Caution: Stop All Actuations.
3 Turn the ignition off.
Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose, fitting or line, the fuel
system pressure must be released.
Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module.
Install special 5/16 fuel line adapter tool #6539 between disconnected fuel line and
the fuel pump module.
Attach a fuel pressure test gauge to the T fitting on tool #6539.
Turn the ignition on.
With the DRB, actuate the ASD Fuel System test and observe the fuel pressure
gauge.
Note: Fuel pressure specification is 400 KPa +/- 34 KPa (58 psi +/- 5 psi).
Is the fuel pressure within specification now?
Yes → Repair/replace fuel supply line as necessary.
→ Go To 4
No
Caution: Stop All Actuations.
4 Turn the ignition off.
Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose,fitting or line, the fuel
system pressure must be released.
Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer.
Is the Fuel Inlet Strainer plugged?
Yes → Replace the Fuel Pump Inlet Strainer.
→ Go To 5
No
5 If there are no possible causes remaining, view repair.
Repair
Continued
ACTION
Go To 3
Go To 6
Check the fuel return line for kinks or restrictions. If OK, replace
the fuel filter/pressure regulator.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Replace the Fuel Pump Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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APPLICABILITY
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All
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All