Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1028
3.
(K99) O2 1/1 HEATER CONTROL CIRCUIT HIGH RESISTANCE
Disconnect the O2 harness connectors.
With the scan tool, actuate the O2 Heater.
Using a 12-volt test light connected ground, probe the (K99) O2 1/1 Heater Control circuit from the O2 harness
connector.
NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connec-
tion to the battery.
Does the test light illuminate brightly?
Yes
>> Go To 4
No
>> Repair the excessive resistance in the (K99) O2 1/1 Heater Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
4.
(Z904) O2 1/1 HEATER GROUND CIRCUIT HIGH RESISTANCE
Using a 12-volt test light connected battery voltage, probe the (Z904) O2 Heater ground circuit in the O2 Sensor
harness connector.
NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connec-
tion to the battery.
Does the test light illuminate brightly?
Yes
>> Go To 5
No
>> Repair the excessive resistance in the (Z904) O2 1/1 Heater ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
5.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
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P0137-O2 SENSOR 1/2 CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W.
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 137
•
When Monitored:
Engine running for less than 30 seconds and the O2 Sensor Heater Temperature is less than 251°C (484°F)
with battery voltage greater 10.99 volts.
•
Set Condition:
The oxygen sensor signal voltage is below 1.5 volts for 3 seconds after starting engine. One Trip Fault. Three
good trips to turn off the MIL.
Possible Causes
(K904) O2 DOWNSTREAM RETURN CIRCUIT SHORTED TO GROUND
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO GROUND
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO (K904) O2 DOWNSTREAM RETURN CIRCUIT
(K141) O2 1/2 SIGNAL SHORTED TO THE (Z902) O2 1/2 HEATER GROUND CIRCUIT
O2 SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
O2 SENSOR BELOW 1.5 VOLTS
Start the engine.
Allow the engine to reach normal operating temperature.
With a scan tool, read the 1/2 O2 Sensor voltage.
Is the voltage below 1.5 volts?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
(K141) O2 1/2 SIGNAL CIRCUIT
Turn the ignition off.
Disconnect the 1/2 O2 Sensor harness connector.
Ignition on, engine not running.
With a scan tool, monitor the 1/2 O2 Sensor voltage.
Is the O2 Sensor voltage above 4.8 volts?
Yes
>> Go To 3
No
>> Go To 5
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ENGINE ELECTRICAL DIAGNOSTICS
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3.
O2 SENSOR
Measure the voltage on the (K904) O2 Downstream Return circuit in
the O2 Sensor harness connector.
Is the voltage at 2.5 volts?
Yes
>> Replace the O2 Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(K904) O2 DOWNSTREAM RETURN CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the (K904) O2 Down-
stream Return circuit in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K904) O2 Downstream
Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
5.
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the (K141) O2 1/2 Signal
circuit in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K141) O2 1/2 Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
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ENGINE ELECTRICAL DIAGNOSTICS
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