Diagnostic Test

ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
NOTE:
If an O2 sensor signal circuit is shorted to voltage, all O2 sensor voltage readings displayed on the scan tool will be approximately 5.0 Volts. Diagnose the sensor that set the most current DTC.
1. Start the engine and allow it to idle for at least 60 seconds.
  WARNING:
  When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
2. With the scan tool, read the active DTCs.
  Is the DTC Active at this time?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
(K141) O2 SENSOR 1/2 SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking O2 Sensor Signal Circuit For Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connectors.
3. Disconnect the O2 Sensor 1/2 harness connector.
4. Turn the ignition on.
5. Measure the voltage on the (K141) O2 Sensor 1/2 Signal circuit in the O2 Sensor 1/2 harness connector.
  NOTE:
  Measure the voltage in reference to ground, not the (K904) O2 Sensor 1/2 Return circuit.
  
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (K141) O2 Sensor 1/2 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.6L - POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3.
(K904) O2 SENSOR 1/2 RETURN CIRCUIT SHORTED TO VOLTAGE

Fig 2: Checking Oxygen Sensor Return Upstream Circuit For Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Measure the voltage on the (K904) O2 Sensor 1/2 Return circuit in the O2 Sensor 1/2 harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (K904) O2 Sensor 1/2 Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.6L - POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4.
O2 SENSOR 1/2

Fig 3: Checking Oxygen Sensor Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Reconnect the PCM C2 harness connectors.
3. Ignition on, engine not running.
4. With the scan tool, monitor the O2 Sensor 1/2 voltage.
5. Connect a jumper wire between the (K141) O2 Sensor 1/2 Signal circuit and the (K904) O2 Sensor 1/2 Return circuit in the O2 Sensor 1/2 harness connector.
  Is the voltage between 2.3 and 2.7 Volts with the jumper wire installed?
  
  Yes
  - Verify that there is good pin to terminal contact in the O2 Sensor 1/2 and Powertrain Control Module connectors. If OK, replace the 1/2 O2 Sensor. Refer to SENSOR, OXYGEN, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.6L - POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5.
    NOTE:
    Remove the jumper wire before continuing.
(K141) O2 SENSOR 1/2 SIGNAL CIRCUIT OPEN

Fig 4: Checking O2 Sensor 1/2 Signal Circuit For Open
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Measure the resistance of the (K141) O2 Sensor 1/2 Signal circuit from the O2 Sensor 1/2 harness connector to the PCM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the open in the (K141) O2 Sensor 1/2 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.6L - POWERTRAIN VERIFICATION TEST .
(K904) O2 SENSOR 1/2 RETURN CIRCUIT OPEN

Fig 5: Checking O2 Sensor Return Circuit For Open
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the (K904) O2 Sensor 1/2 Return circuit at the O2 Sensor 1/2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 7.
  No
  - Repair the open in the (K904) O2 Sensor 1/2 Return 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 .