Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record all Freeze frame data.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for 75 seconds.
5. Start the engine and let idle for up to five minutes.
6. With the scan tool, read DTCs.
  Did the DTC reset?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE (K299) O2 SENSOR 1/2 HEATER SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 1: Checking O2 Sensor 1/2 Heater Supply Circuit For Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the Oxygen Sensor 1/2 and the Smart O2 Sensor Module from the Aftertreatment Wiring Harness.
  NOTE:
  Check connectors - Clean/repair as necessary, inspect for signs of Water intrusion in the connector.
2. Measure the resistance of the (K299) O2 Sensor 1/2 Heater Supply circuit between the O2 Sensor 1/2 harness connector and the Smart O2 Sensor Module harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 3.
  No
  - Repair the (K299) O2 Sensor 1/2 Heater Supply circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (K80) O2 SENSOR 1/2 HEATER RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 2: Checking O2 Sensor 1/2 Heater Return Circuit For Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (K80) O2 Sensor 1/2 Heater Return circuit between the O2 Sensor harness connector and the Smart O2 Sensor Module harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4.
  No
  - Repair the (K80) O2 Sensor 1/2 Heater Return circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
OXYGEN SENSOR AND SMART MODULE

Fig 3: Measuring Resistance Of O2 Sensor Heater Circuit In O2 Sensor
Courtesy of CHRYSLER GROUP, LLC
1. Measure resistance of the O2 Sensor 1/2 Heater between the (K299) O2 Sensor 1/2 Heater Supply and (K80) O2 Heater Return circuits.
  Is the resistance 3.2 +/- 0.8 Ohms at ambient temperature?
  
  Yes
  - Replace Smart O2 Sensor Module in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Replace the O2 Sensor 1/2 in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .