Diagnostic Test

DTC IS ACTIVE
1. Turn the ignition on.
2. With a scan tool, select View DTCs. Record DTC and Freeze Frame information.
3. 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 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.
4. With a scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go To 2.
  No
  - Perform the CHECKING FOR AN INTERMITTENT DTC diagnostic procedure. Refer to CHECKING FOR AN INTERMITTENT DTC .
(K243) O2 2/2 SIGNAL CIRCUIT
1. Turn the ignition off.
2. Disconnect the 2/2 Oxygen Sensor harness connector.
3. Turn the ignition on.
4. With a scan tool, read the 2/2 Oxygen Sensor voltage.
  Is the 2/2 Oxygen Sensor voltage above 4.8 volts?
  
  Yes
  - Go To 3.
  No
  - Go To 5.
2/2 OXYGEN SENSOR

Fig 1: Measuring Voltage On O2 Sensor Return Circuit In Oxygen Sensor Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Measure the voltage on the (K904) O2 Return (Downstream) circuit in the 2/2 O2 Sensor harness connector.
  Is the voltage between 2.40 and 2.60 volts?
  
  Yes
  - Replace the 2/2 O2 Sensor.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 4.
(K904) O2 RETURN (DOWNSTREAM) CIRCUIT FOR A SHORT TO GROUND

Fig 2: Checking O2 Return Circuit For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the C1 Powertrain Control Module (PCM) harness connector.
3. Measure the resistance between ground and the (K904) O2 Return (Downstream) circuit in the 2/2 Oxygen Sensor harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the short to ground in the (K904) O2 Return (Downstream) circuit.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 5.
(K243) O2 2/2 SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 3: Checking O2 Signal Circuit For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the (K243) O2 2/2 Signal circuit in the 2/2 O2 Sensor harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the short to ground in the (K243) O2 2/2 Signal circuit.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 6.
(K243) O2 2/2 SIGNAL CIRCUIT FOR A SHORT TO THE (K904) O2 RETURN (DOWNSTREAM) CIRCUIT

Fig 4: Checking O2 Signal Circuit For Short To O2 Return Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (K243) O2 2/2 Signal circuit and the (K904) O2 Return (Downstream) circuit in the 2/2 Oxygen Sensor harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the short between the (K243) O2 2/2 Signal circuit and the (K904) O2 Return (Downstream) circuit.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 7.
POWERTRAIN CONTROL MODULE (PCM)
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. Refer to any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .