Diagnostic Test

O2 SENSOR HEATER OPERATION
1. Turn the ignition off.
  NOTE:
  Wait a minimum of eight minutes to allow the O2 Sensor to cool down before continuing the test. Allow the O2 Sensor voltage to stabilize between 4.6 and 5.0 Volts.
2. Ignition on, engine not running.
3. With the scan tool, actuate the O2 Sensor 1/2 Heater Test.
4. Using the scan tool, monitor O2 Sensor 1/2 voltage for at least two minutes.
  Does the voltage stay above 4.5 Volts?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
O2 SENSOR 1/2 HEATER ELEMENT
1. Turn the ignition off.
  NOTE:
  Allow the O2 sensor to cool down to room temperature.
2. Disconnect the O2 Sensor 1/2 harness connector.
3. Measure the resistance of the O2 Sensor 1/2 Heater Element across the O2 Sensor, between the O2 Sensor Heater Control terminal and the Heater ground terminal.
  NOTE:
  O2 Heater Element resistance values should be measured at 21.1° C (70° F). The resistance value will vary with different temperature values.
  
  Is the resistance of the O2 Sensor 1/2 Heater Element between 2.0 and 30.0 Ohms?
  
  Yes
  - Go To 3.
  No
  - Verify that there is good pin to terminal contact in the O2 Sensor 1/2 and Powertrain Control Module connectors. If OK, replace the O2 Sensor 1/2. Refer to SENSOR, OXYGEN, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.6L - POWERTRAIN VERIFICATION TEST .
(K299) O2 SENSOR 1/2 HEATER CONTROL CIRCUIT OPEN

Fig 1: Checking O2 Sensor 1/2 Heater Control Circuit For Open
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the PCM C2 harness connector.
2. Measure the resistance of the (K299) O2 Sensor 1/2 Heater Control circuit from the O2 Sensor 1/2 harness connector to the PCM C2 harness connector.
  Is the resistance below 0.5 Ohm?
  
  Yes
  - Go To 4.
  No
  - Repair the excessive resistance in the (K299) O2 Sensor 1/2 Heater Control circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.6L - POWERTRAIN VERIFICATION TEST .
(Z902) O2 SENSOR 1/2 HEATER GROUND CIRCUIT OPEN

Fig 2: Checking O2 Sensor Heater Ground Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the (Z902) O2 Sensor 1/2 Heater ground circuit in the O2 Sensor 1/2 harness connector.
  Is the resistance below 0.5 Ohm?
  
  Yes
  - Go To 5.
  No
  - Repair the excessive resistance in the (Z902) O2 Sensor 1/2 Heater ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.6L - POWERTRAIN VERIFICATION TEST .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor 1/2 and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the O2 Sensor 1/2 and Powertrain Control Module connectors.
4. Perform any Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.6L - POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL REMOVAL.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.6L - POWERTRAIN VERIFICATION TEST .