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Home >> Fiat >> 2019 >> 500L Trekking >> Repair and Diagnosis >> Engine Performance >> System >> 1.4L - DTCS P0016-00 To P0270-00 >> DTC Troubleshooting >> P0130-00-O2 Sensor 1/1 Circuit Open >> Diagnostic Test

Diagnostic Test

  1. CHECK THE O2 SENSOR VOLTAGE READINGS 
    1. Turn the ignition off.
    2. Disconnect the O2 Sensor 1/1 harness connector.
    3. Connect the (special tool #10367, Adapter, Wideband O2 Sensor Diagnostic) in-line of the O2 Sensor 1/1 harness connector.
    4. Start the engine and bring the engine speed up to 2500 rpm.
    5. With the engine steady at 2500 rpm, measure the voltage:
      • at the (K41) O2 Sensor Signal circuit at the appropriate terminal of the Wide-band O2 Sensor Diagnostic Adaptor 10367 tool.
      • at the (K902) O2 Sensor Return circuit at the appropriate terminal of the Wide-band O2 Sensor Diagnostic Adaptor 10367 tool.
      • at the (K89) O2 Sensor Pump Current circuit at the appropriate terminal of the Wide-band O2 Sensor Diagnostic Adaptor 10367 tool.
      • between the (K89) O2 Sensor Pump Current circuit and the (K902) O2 Sensor Return circuit at the appropriate terminals of the Wide-band O2 Sensor Diagnostic Adaptor 10367 tool.
      NOTE:

      If the Powertrain Control Module detects an active open or short on any of the O2 Sensor 1/1 circuits, it will power down all of the O2 Sensor circuits to protect the O2 Sensor and PCM internal ASIC from being damaged.

    6. If the O2 Sensor is powered up by the PCM and operating normal, the voltage readings should be as follows;
      • The voltage at the (K41) O2 Sensor Signal circuit should be approximately 4.3 volts.
      • The voltage at the (K902) O2 Sensor Return circuit should be approximately 3.85 volts.
      • The voltage at the (K89) O2 Sensor Pump Current circuit should be switching between approximately 3.4 volts and 4.3 volts.
      • The voltage between the (K89) O2 Sensor Pump Current circuit and the (K902) O2 Sensor Return circuit should switch between +0.45 volts and -0.45 volts.
      NOTE:

      The voltage readings may vary up or down slightly depending on the age of the O2 Sensor and operating conditions of the engine. However, if the engine and O2 Sensor are operating normal the voltage reading between the (K89) O2 Sensor Pump Current circuit and the (K902) O2 Sensor Return circuit should switch between +0.45 volts and -0.45 volts with very little or no change.

      Do the circuit voltages read as described?

      Yes 

      No 

      • Go To  2
  2. CHECK THE (F344) FUSED ASD RELAY OUTPUT VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the O2 Sensor 1/1 harness connector.
    3. Remove the Wide-band O2 Sensor Diagnostic Adaptor 10367 tool. Leave the O2 Sensor 1/1 harness connector disconnected.
    4. Turn the ignition on.
    5. Measure the voltage on the (F344) Fused ASD Relay Output circuit at the O2 Sensor 1/1 harness connector.

      Does the voltage read battery voltage?

      Yes 

      • Go To  3

      No 

      • Repair the (F344) Fused ASD Relay Output circuit for an open or short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  3. CHECK THE O2 SENSOR CIRCUITS FOR A SHORT TO VOLTAGE 
    1. Measure for voltage at the:
      • (K41) O2 Sensor 1/1 Signal circuit at the O2 Sensor 1/1 harness connector.
      • (K902) O2 Sensor 1/1 Return circuit at the O2 Sensor 1/1 harness connector.
      • (K89) O2 Sensor 1/1 Current Pump Control circuit at the O2 Sensor 1/1 harness connector.
      • (K103) O2 Sensor 1/1 Pump Cell Current Trim at the O2 Sensor 1/1 harness connector.
      NOTE:

      With the O2 Sensor disconnected, the PCM will power down the O2 Sensor and there should be no voltage on the circuits.

      Do any of the circuits measure above 0.5 volts?

      Yes 

      • Repair the circuit that measured above 0.5 volts for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE O2 SENSOR CIRCUITS FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the PCM C1 harness connector.
    3. Check for continuity between ground and the:
      • (K41) O2 Sensor 1/1 Signal circuit at the O2 Sensor 1/1 harness connector.
      • (K902) O2 Sensor 1/1 Return circuit at the O2 Sensor 1/1 harness connector.
      • (K89) O2 Sensor 1/1 Current Pump Control circuit at the O2 Sensor 1/1 harness connector.
      • (K103) O2 Sensor 1/1 Pump Cell Current Trim at the O2 Sensor 1/1 harness connector.

      Is there continuity between any of the above circuits and ground?

      Yes 

      No 

      • Go To  5
  5. CHECK THE O2 SENSOR CIRCUITS FOR AN OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the:
      • (K41) O2 Sensor 1/1 Signal circuit between the O2 Sensor 1/1 harness connector and the PCM C1 harness connector.
      • (K902) O2 Sensor 1/1 Return circuit between the O2 Sensor 1/1 harness connector and the PCM C1 harness connector.
      • (K89) O2 Sensor 1/1 Current Pump Control circuit between the O2 Sensor 1/1 harness connector and the PCM C1 harness connector.
      • (K103) O2 Sensor 1/1 Pump Cell Current Trim at the O2 Sensor 1/1 harness connector and the PCM C1 harness connector.

      Is the resistance below 3.0 Ohms for each of the above circuits?

      Yes 

      • Go To  6

      No 

      • Repair the circuit that measured above 3.0 Ohms for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. REPLACE THE O2 SENSOR AND RETEST FOR DTC 
    1. Turn the ignition off.
    2. Reconnect the PCM C1 harness connector.
    3. Replace the O2 Sensor accordance with the Service Information and reconnect the harness connector. Refer to SENSOR, OXYGEN, REMOVAL .
    4. Turn the ignition on.
    5. With the scan tool, erase DTCs.
    6. Start the engine and allow it to idle long enough for the O2 Sensor to enter closed loop operation.
    7. 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.

      Is the DTC active or pending?

      Yes 

      No 

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