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Home >> Dodge and Ram >> 2021 >> Charger SXT, RWD, Gas >> Repair and Diagnosis >> Engine Performance >> System >> 3.6L - DTCS C053D To P0137 >> DTC Troubleshooting >> P0137-O2 Sensor 1/2 Circuit Low >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR ANY SERVICE BULLETINS OR PCM SOFTWARE UPDATES 
    1. Check for any applicable Service Bulletins or Flash updates related to the DTC.

      Are there any applicable Service Bulletins or Flash updates?

      Yes 

      No 

      • Go To  2
  2. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN 
    1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
    2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
    3. With the scan tool, erase all DTCs.
    4. Turn the ignition off for a minimum of 10.0 seconds.
    5. Turn the ignition on.
    6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    7. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  3

      No 

  3. CHECK THE O2 SENSOR 1/2 (K141) SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the O2 Sensor 1/2 harness connector.
    3. Disconnect the PCM C2 harness connector.
    4. Check for continuity between ground and the O2 Sensor 1/2 (K141) Signal circuit at the O2 Sensor 1/2 harness connector.

      Is there continuity between ground and the O2 Sensor 1/2 (K141) Signal circuit?

      Yes 

      • Repair the O2 Sensor 1/2 (K141) Signal circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK FOR THE O2 SENSOR 1/2 (K141) SIGNAL CIRCUIT SHORTED TO THE O2 SENSOR 1/2 (Z703) GROUND CIRCUIT 
    1. Check for continuity between the O2 Sensor 1/2 (K141) Signal circuit and the O2 Sensor 1/2 (Z703) Ground circuit in the O2 Sensor 1/2 harness connector.

      Is there continuity between the O2 Sensor 1/2 (K141) Signal circuit and the O2 Sensor 1/2 (Z703) Ground circuit?

      Yes 

      • Repair the short between the O2 Sensor 1/2 (K141) Signal circuit and the O2 Sensor 1/2 (Z703) ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE O2 SENSOR 1/2 (K141) SIGNAL CIRCUIT FOR PROPER VOLTAGE AT THE O2 SENSOR HARNESS CONNECTOR 
    1. Turn the ignition off.
    2. Connect the PCM C2 harness connector.
    3. Start the engine and allow it to idle.
    4. With the scan tool, read the O2 Sensor 1/2 Signal voltage.

      Is the O2 Sensor 1/2 voltage above 4.0 volts?

      Yes 

      No 

      • Go To  6
  6. CHECK RELATED PCM AND COMPONENT CONNECTIONS 
    1. Perform any Service Bulletins that apply.
    2. Disconnect all PCM harness connectors.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
    10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    11. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read 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 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.

    4. With the scan tool, read the active DTCs.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the O2 Sensor 1/2 harness connector.
    3. Turn the ignition on.
    4. With the scan tool, monitor the O2 Sensor 1/2 voltage.

      Is the O2 Sensor 1/2 voltage between 4.1 and 5.0 volts?

      Yes 

      • Go To  3

      No 

      • Go To  5
  3. O2 SENSOR 
    1. Measure the voltage between ground and the (K904) O2 Sensor 1/2 Return circuit in the O2 Sensor 1/2 harness connector.

      Is the voltage at 2.5 volts?

      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 O2 Sensor 1/2. Refer to SENSOR, OXYGEN, REMOVAL .
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (K904) O2 SENSOR 1/2 RETURN CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Check for continuity between ground and the (K904) O2 Sensor 1/2 Return circuit in the O2 Sensor 1/2 harness connector.

      Is there continuity between ground and the (K904) O2 Sensor 1/2 Return circuit?

      Yes 

      • Repair the (K904) O2 Sensor 1/2 Return circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8
  5. CHECK THE (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Check for continuity between ground and the (K141) O2 Sensor 1/2 Signal circuit in the O2 Sensor 1/2 harness connector.

      Is there continuity between ground and the (K141) O2 Sensor 1/2 Signal circuit?

      Yes 

      • Repair the (K141) O2 Sensor 1/2 Signal circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK FOR THE (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT SHORTED TO THE (K904) O2 SENSOR 1/2 RETURN CIRCUIT 
    1. Check for continuity 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 there continuity between the (K141) O2 Sensor 1/2 Signal circuit and the (K904) O2 Sensor 1/2 Return circuit?

      Yes 

      • Repair the short between the (K904) O2 Sensor 1/2 Return circuit and the (K141) O2 Sensor 1/2 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK FOR THE (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT SHORTED TO THE O2 SENSOR 1/2 HEATER GROUND CIRCUIT 
    1. Check for continuity between the (K141) O2 Sensor 1/2 Signal circuit and the O2 Sensor 1/2 Heater ground circuit in the O2 Sensor 1/2 harness connector.

      Is there continuity between the (K141) O2 Sensor 1/2 Signal circuit and the O2 Sensor 1/2 Heater ground circuit?

      Yes 

      • Repair the short between the O2 Sensor 1/2 Heater ground circuit and the (K141) O2 Sensor 1/2 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8
  8. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the appropriate SYSTEM 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 Oxygen Sensor 1/2 and Powertrain Control Module connectors.
    4. Perform any Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No 

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