Chrysler 300M 2002 Service Manual page 2535

DRIVEABILITY - NGC
P0171-FUEL SYSTEM 1/1 LEAN —
TEST
5 Ignition on, engine not running.
With the DRBIII , read TPS voltage.
NOTE: The throttle must be against the stop.
Is the voltage 0.92 or less with the Throttle closed?
Yes → Go To 6
→ Check for a binding throttle condition. If OK, replace the Throttle
No
6 Ignition on, engine not running.
With the DRBIII , read the TPS voltage.
While monitoring the DRBIII , slowly open and close the throttle.
Does the voltage increase and decease smoothly?
Yes → Go To 7
→ Replace the Throttle Position Sensor.
No
7 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.
With the DRBIII in Sensors, read the MAP Sensor vacuum value.
Is the DRBIII reading within 1 of the Vacuum Gauge reading?
Yes → Go To 8
→ Replace the MAP Sensor.
No
8 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 soak)
Ignition on, engine not running.
With the DRBIII , read the Engine Coolant Temperature (ECT) Sensor value. If the
engine was allowed to sit overnight (cold soak), the temperature value should be a
sensible value that is somewhere close to the 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 ECT Sensor value. The temperature value
change should be a smooth transition from start up to normal operating temperature
82°C (180°F). The value should reach at least 82°C (180°F).
Did the ECT value increase with a smooth transition and did it reach at least 82°C?
Yes → Go To 9
→ Replace the Engine Coolant Temperature Sensor.
No
ACTION
Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Continued
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APPLICABILITY
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