Chrysler 300M 2002 Service Manual page 2543

DRIVEABILITY - NGC
P0172-FUEL SYSTEM 1/1 RICH —
TEST
12 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Turn the ignition on.
Measure the voltage of the O2 Sensor Signal circuit in the O2 Sensor harness
connector.
Is the voltage above 4.8 volts?
Yes → Check the O2 Sensor Signal circuit for damage, short to ground,
No
13 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Turn the ignition on.
Measure the voltage on the O2 Sensor Return circuit in the O2 Sensor harness
connector.
Is the voltage at 2.5 volts?
Yes → NOTE: Before continuing, check the PCM harness connector
No
14 NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
NOTE: Check for contaminates that may have damaged the O2 Sensor:
contaminated fuel, unapproved silicone, oil and coolant.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
With the engine running at normal operating temperature, monitor the DRBIII
parameters related to the DTC while wiggling the wire harness. Look for parameter
values to change and/or a DTC to set.
Review the DRBIII Freeze Frame information. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
Yes → Repair as necessary
No
ACTION
open, or short to voltage. Inspect the O2 Sensor connector and the
PCM harness connector. If OK, replace the Powertrain Control
Module in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 13
terminals for corrosion, damage, or terminal push out. Repair as
necessary. Replace and program the Powertrain Control Module
in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Check the O2 Sensor Return circuit for damage, short to ground,
open, or short to voltage. Inspect the O2 Sensor connector and the
PCM harness connector. If OK, replace the Powertrain Control
Module in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Test Complete.
Continued
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APPLICABILITY
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