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Diagnostic Test

  1. ACTIVE DTC 
    NOTE: Check the vehicle repair history. If the 1/2 O2 Sensor has been replaced make sure that the O2 sensor was properly installed and meets OEM specification.
    NOTE: Check for contaminants that may have damaged the O2 Sensor: contaminated fuel, unapproved silicone, oil and coolant.
    1. Ignition on, engine not running.
    2. With a scan tool, read DTCs.

      Is the DTC active at this time?

      Yes 

      • Go to step  2

      No 

  2. CHECKING THE EXHAUST SYSTEM FOR LEAKS 
    1. Perform the diagnostic procedure for CHECKING THE EXHAUST SYSTEM FOR LEAKS. Refer to Non-DTC Diagnostics/Driveability - Gas - Diagnosis and Testing

      Were any problems found?

      Yes 

      No 

      • Go to step  3
  3. ENGINE MECHANICAL PROBLEM 

    Check for any of the following conditions/mechanical problems:

    • AIR INDUCTION SYSTEM - must be free from leaks
    • ENGINE VACUUM - must be at least 13 inches in neutral
    • ENGINE VALVE TIMING - must be within specifications
    • ENGINE COMPRESSION - must be within specifications
    • ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks
    • ENGINE PCV SYSTEM - must flow freely
    • TORQUE CONVERTER STALL SPEED - must be within specifications
    • POWER BRAKE BOOSTER - no internal vacuum leaks
    • FUEL - must be free of contamination
    • FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector

    Are there any engine mechanical problems?

    Yes 

    No 

    • Go to step  4
  4. O2 SENSOR 
    Fig 1: Checking O2 1/2 Signal Circuit
    GC0117199Courtesy of CHRYSLER LLC
    1. Ignition on, engine not running.
    2. Disconnect the 1/2 O2 Sensor harness connector.
    3. With the scan tool, monitor the 1/2 O2 Sensor voltage.
    4. The O2 Sensor voltage should read 5.0 volts on the scan tool with the connector disconnected.
    5. Using a jumper wire, jump the (K141) O2 Sensor 1/2 Signal circuit to the (K902) O2 Downstream Return circuit in the O2 Sensor harness connector.
      NOTE: The voltage should drop from 5.0 volts to 2.5 volts with the jumper wire in place.

      Did the O2 Sensor volts change from 5.0 volts to 2.5 volts?

      Yes 

      No 

      • Go to step  5
  5. (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT 
    1. Remove the jump wire.
    2. Ignition on, engine not running.
    3. With the scan tool, monitor the 1/2 O2 Sensor voltage.

      Is the voltage above 4.8 volts?

      Yes 

      • Go to step  6

      No 

  6. (K299) O2 SENSOR 1/2 HEATER CONTROL CIRCUIT 
    Fig 2: Checking O2 1/2 Heater Control Circuit
    GC0117135Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Measure the resistance between ground and the (K299) O2 Sensor 1/2 Heater Control circuit in the O2 Sensor harness connector.

      Is the resistance below 5.0 ohms?

      Yes 

      No 

      • Go to step  7
  7. (K902) O2 DOWN STREAM RETURN CIRCUIT 
    Fig 3: Checking O2 Downstream Return Circuit
    GC0117194Courtesy of CHRYSLER LLC
    1. Measure the voltage on the (K902) O2 Downstream Return circuit in the O2 Sensor harness connector.

      Is the voltage at 2.5 volts?

      Yes 

      No 

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