Chrysler PT Cruiser 2001 Service Manual Supplement page 2554

DRIVEABILITY - GAS
P0172-1/1 FUEL SYSTEM RICH —
TEST
10 Note: For this test to be valid, the thermostat must be operating correctly.
Note: This test works best if performed on a cold engine (cold soaked).
Turn the ignition on.
With the DRB, read the ENG COOLANT TMP DEG value. If the engine was allowed
to sit overnight (cold soak), the engine temperature value should be a sensible value
that is close to the surrounding temperature (ambient temperature).
Note: If engine coolant temperature is above 82° C (180° F), allow the engine
to cool until 65° C (150° F) is reached.
Start the engine.
During engine warm-up, monitor the ENG COOLANT TMP DEG value. The temp
deg value change should be a smooth transition from start up to normal operating
temp 82° C (180° F). The value should reach at least 82° C (180° F).
Did the ENG COOLANT TMP DEG value increase smoothly and did it reach at least
82° C (180° F)?
Yes → Go To 11
→ Replace the Engine Coolant Temperature Sensor.
No
11 Turn the ignition off.
NOTE: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wiring harness connectors. Look for
broken, bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Perform a wiggle test on the related wiring harnesses with the engine running.
Watch for the Good Trip Counter to change to 0.
Were any problems found?
Yes → Repair wiring harness/connectors as necessary.
→ Go To 12
No
12 Turn the ignition off.
Connect a Vacuum Gauge to a Manifold Vacuum source.
Start the engine.
Allow the engine to idle.
Note: If engine will not idle, maintain a constant RPM above idle.
Using the DRB, monitor the MAP Sensor vacuum value.
Is the DRB reading within 1 of the Vacuum Gauge reading?
Yes → Go To 13
→ Replace the MAP Sensor.
No
Continued
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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APPLICABILITY
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