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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 120 (1.4L 16-Valve - DTCS P0016-00 To P0353-00 - 500) >> DTC Troubleshooting >> P0137-00-O2 Sensor 1/2 Circuit Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read DTCs and record on the repair order.
    3. Start the engine and test drive the vehicle long enough for the O2 Sensor to enter closed loop operation.
    4. With the scan tool, read DTCs.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (K904) O2 SENSOR 1/2 RETURN CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the O2 Sensor 1/2 harness connectors.
    3. Disconnect the PCM C1 harness connector.
    4. Check for continuity between ground and the (K904) O2 Sensor 1/2 Return circuit at 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  3
  3. CHECK THE (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (K141) O2 Sensor 1/2 Signal circuit at 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  4
  4. CHECK FOR THE (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT SHORTED TO THE (K904) O2 SENSOR RETURN CIRCUIT 
    1. Check for continuity between the (K141) O2 Sensor 1/2 Signal circuit and the (K904) O2 Sensor 1/2 Return circuit at the O2 Sensor harness connector.

      Is there continuity between ground and the (K141) O2 Sensor 1/2 Signal and the (K904) O2 Sensor 1/2 Return circuit at the O2 Sensor harness connector.

      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  5
  5. CHECK FOR THE (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT SHORTED TO THE (K299) O2 SENSOR 1/2 HEATER CONTROL CIRCUIT 
    1. Check for continuity between the (K141) O2 Sensor 1/2 Signal circuit and the (K299) O2 Sensor 1/2 Heater Control circuit at the O2 Sensor 1/2 harness connector.

      Is there continuity between the (K141) O2 Sensor 1/2 Signal circuit and the (K299) O2 Sensor 1/2 Heater Control circuit at the O2 Sensor 1/2 harness connector?

      Yes 

      • Repair the short between the (K141) O2 Sensor 1/2 Signal circuit and the (K299) O2 Sensor 1/2 Heater Control circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. O2 SENSOR 
    1. Replace the O2 Sensor 1/2 in accordance with the Service Information.
    2. Reconnect the PCM C1 harness connector.
    3. Turn the ignition on.
    4. With the scan tool, erase DTCs.
    5. Start the engine and test drive the vehicle long enough for the O2 Sensor to enter closed loop operation.
    6. With the scan tool, read DTCs.

      Is the DTC active or pending?

      Yes 

      • Go To  7

      No 

  7. 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 

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