Chrysler 2005 Crossfire SRT6 Service Manual page 2169

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(P0172) FUEL SYSTEM 1/1 LEAN CONTROL BELOW LIMIT (AT LOAD) (CONTINUED)
4.
O2 SENSOR OPERATION
Start the engine.
Allow the engine to reach normal operating temperature.
With the DRB III , read the O2 Sensor voltage.
Is the voltage switching between 0.4 and 0.6 volt?
Yes >> Go To 5
No >> Go To 9
5.
O2 SENSOR HEATER OPERATION
Turn the ignition off.
Note: Allow the O2 Sensor to cool down before continuing the
test. Raising the hood may help in reducing under hood temper-
atures.
Connect a jumper wire between ground and the Oxygen Sensor
Heater Control circuit at the PCM harness connector leaving the har-
ness connector connected to the PCM.
Turn the ignition on.
With the DRB III , monitor O2 Sensor voltage for at least 2 minutes.
CAUTION: Remove the jumper wire after this Step is complete.
Does the voltage stay above 0.47 volt?
Yes >> Replace the Oxygen Sensor. (Refer to 14 - FUEL SYS-
TEM/FUEL INJECTION/O2 SENSOR - REMOVAL).
Perform POWERTRAIN VERIFICATION TEST - VER 2.
No >> Go To 6
6.
MAP SENSOR OPERATION
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 DRB III in Sensors, read the MAP Sensor vacuum value.
Is the DRB III reading within 33.9 mbar (1 in. Hg) of the Vac-
uum Gauge reading?
Yes >> Go To 7
No >> Replace the Manifold Absolute Pressure Sensor. (Refer to
14 - FUEL SYSTEM/FUEL INJECTION/MAP SENSOR -
REMOVAL).
Perform POWERTRAIN VERIFICATION TEST - VER 2.
ENGINE - ELECTRICAL DIAGNOSTICS 9 - 245