Diagnostic Test

DTC IS ACTIVE
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.

NOTE: After repairs have been completed, verify proper O2 Sensor operation. If all O2 Sensor voltage readings have not returned to normal, perform the diagnostic procedure for the remaining O2 Sensors.

NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set.
1. Start the engine and allow it to reach operating temperature.
  WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hand near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.
2. With a scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go to step 2
  No
  - Perform the CHECKING FOR AN INTERMITTENT DTC diagnostic procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
CHECKING THE EXHAUST SYSTEM FOR LEAKS
1. Perform the diagnostic procedure for CHECKING THE EXHAUST SYSTEM FOR LEAKS .
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 3
(K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 1: Measuring Voltage Of O2 Sensor Signal Circuit In Oxygen Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the 2/2 Oxygen Sensor harness connector.
3. Disconnect the Powertrain Control Module (PCM) harness connector.
4. Turn the ignition on.
5. Measure the voltage of the (K243) O2 2/2 Signal circuit in the 2/2 Oxygen Sensor harness connector.
  NOTE: Measure the voltage in reference to ground, not the (K904) O2 Return (Down) circuit.
  
  Is there any voltage present?
  
  Yes
  - Repair the (K243) O2 2/2 Signal circuit for a short to voltage.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 4
(K904) O2 RETURN (DOWN) CIRCUIT SHORTED TO VOLTAGE

Fig 2: Measuring Voltage Of O2 Sensor Return (Down) Circuit In Oxygen Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the voltage of the (K904) O2 Return (Down) circuit in the 2/2 Oxygen Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (K904) O2 Return (Down) circuit for a short to voltage.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 5
(K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO GROUND

Fig 3: Measuring Resistance Between Ground And O2 Sensor Signal Circuit In Oxygen Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Measure the resistance between ground and the (K243) O2 2/2 Signal circuit in the 2/2 Oxygen Sensor harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the (K243) O2 2/2 Signal circuit for a short to ground.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 6
(K904) O2 RETURN (DOWN) CIRCUIT SHORTED TO GROUND

Fig 4: Measuring Resistance Between Ground And O2 Sensor Return (Down) Circuit In Oxygen Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (K904) O2 Return (Down) circuit in the 2/2 Oxygen Sensor harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the (K904) O2 Return (Down) circuit for a short to ground.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 7
(K243) O2 2/2 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 5: Measuring Resistance Of O2 Sensor Signal Circuit Between Oxygen Sensor Harness Connector And Appropriate Terminal Of PCM Pinout Box 8815
Courtesy of CHRYSLER LLC

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install the PCM Pinout Box 8815 to perform diagnosis.
1. Measure the resistance of the (K243) O2 2/2 Signal circuit between the 2/2 Oxygen Sensor harness connector and the appropriate terminal of PCM Pinout Box 8815.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go to step 8
  No
  - Repair the (K243) O2 2/2 Signal circuit for an open circuit or high resistance.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K904) O2 RETURN (DOWN) CIRCUIT OPEN OR HIGH RESISTANCE

Fig 6: Measuring Resistance Of O2 Return (Down) Circuit Between Oxygen Sensor Harness Connector And Appropriate Terminal Of PCM Pinout Box 8815
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K904) O2 Return (Down) circuit between the 2/2 Oxygen Sensor harness connector and the appropriate terminal of PCM Pinout Box 8815.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go to step 9
  No
  - Repair the (K904) O2 Return (Down) circuit for an open circuit or high resistance.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
2/2 OXYGEN SENSOR
NOTE: Check for signs of contaminants that may have damaged the O2 Sensor, such as contaminated fuel, unapproved silicone, oil and coolant.
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the 2/2 Oxygen Sensor 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.
4. Perform any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Replace the 2/2 Oxygen Sensor in accordance with the Service Information.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .