Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1174
5.
(K141) O2 SENSOR 1/2 SIGNAL CIRCUIT
Remove the jump wire.
Ignition on, engine not running.
With the scan tool, monitor the 1/2 O2 Sensor voltage.
Is the voltage above 4.8 volts?
Yes
>> Go To 6
No
>> Check the (K141) O2 Sensor 1/2 Signal circuit for an open
or short to voltage. Inspect the O2 Sensor connector and
the PCM harness connector. If OK, replace and program
the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
9 - 720
ENGINE ELECTRICAL DIAGNOSTICS
LX
6.
(K299) O2 SENSOR 1/2 HEATER CONTROL CIRCUIT
Turn the ignition off.
Measure the resistance between ground and the (K299) O2 Sensor 1/2
Heater Control circuit in the O2 Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short to ground in the (K299) O2 Sensor 1/2
Heater Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
7.
(K904) O2 DOWNSTREAM RETURN CIRCUIT
Measure the voltage on the (K904) O2 Downstream Return circuit in
the O2 Sensor harness connector.
Is the voltage at 2.5 volts?
Yes
>> Check the fuel system for contaminants.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Check the (K904) O2 Downstream Return circuit for a short
to ground, open, or short to voltage. Inspect the O2 Sensor
connector and the PCM harness connector. If OK, replace
and program the Powertrain Control Module per Service
Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
LX
ENGINE ELECTRICAL DIAGNOSTICS
9 - 721
9 - 722
ENGINE ELECTRICAL DIAGNOSTICS
LX
P2097-DOWNSTREAM FUEL TRIM SYSTEM 1 RICH
For a complete wiring diagram Refer to Section 8W.
LX
ENGINE ELECTRICAL DIAGNOSTICS
9 - 723
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