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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 599 (3.0L Diesel - DTCS P0001-00 To P0263-00 - 1500) >> Diagnosis And Testing >> P0053-00-O2 Sensor 1/1 Heater Resistance >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. ACTIVE DTC 
    NOTE:

    If there are any Mass Air Flow, Intake Air, or Fuel Delivery DTCs present, perform the Diagnostics on those DTCs before continuing with this one.

    1. Ignition on, engine not running.
    2. Using the scan tool, erase DTCs in the Powertrain Control Module (PCM).
    3. Using the scan tool, actuate the Oxygen Sensor Heater.
    4. Monitor the scan tool for at least two minutes.
    5. Using the scan tool, select View DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go To  2

      No 

      • Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
  2. CHECK THE (K79) O2 SENSOR 1/1 HEATER CONTROL CIRCUIT FOR A SHORT TO GROUND 
    Fig 1: Checking O2 1/1 Heater Control Circuit For A Short To Ground
    GC0099414Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Oxygen Sensor harness connector.
    3. Disconnect the PCM C1 harness connector.
    4. Measure the resistance between ground and the (K79) O2 Sensor 1/1 Heater Control circuit in the Oxygen Sensor harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  3

      No 

      • Repair the (K79) O2 Sensor 1/1 Heater Control circuit for a short to ground.
      • Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  3. CHECK THE (K79) O2 SENSOR 1/1 HEATER CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    Fig 2: Checking O2 Sensor 1/1 Heater Control Circuit For An Open Or High Resistance
    GC0143281Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (K79) O2 Sensor 1/1 Heater Control circuit between the Oxygen Sensor harness connector and the PCM C1 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the (K79) O2 Sensor 1/1 Heater Control circuit for an open or high resistance.
      • Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  4. OXYGEN SENSOR 
    1. Turn the ignition off.
    2. Reconnect the PCM C1 harness connector.
    3. Replace the Oxygen Sensor in accordance with the service information. Refer to SENSOR, OXYGEN, REMOVAL .
    4. Start the engine.
    5. Allow the engine to reach normal operating temperature.
    6. Monitor the scan tool for at least two minutes.
    7. Using the scan tool, select View DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go To  5

      No 

  5. POWERTRAIN CONTROL MODULE 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the 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 

      No 

      • Replace the Powertrain Control Module in accordance with the service information. Refer to REMOVAL .
      • Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
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