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HOMESERVICE MANUALSJEEP2023COMPASS REDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM2.0L - DTCS P0117 TO P018CDTC TROUBLESHOOTINGP0138-O2 SENSOR 1/2 CIRCUIT HIGHDIAGNOSTIC TEST
2023 Jeep Compass Red

Diagnostic Test

2023 Jeep Compass RedSECTION Diagnostic Test
  1. CHECK FOR AN ACTIVE CONDITION 
    1. 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.

    2. With the scan tool, read the O2 Sensor 1/2 signal voltage.

      Is the voltage staying above 4.0 volts?

      Yes 

      • Go To  2

      No 

  2. CHECK THE O2 SENSOR 1/2 HEATER OPERATION 
    1. With the scan tool, check the O2 Sensor 1/2 duty cycle and heater temperature.
      NOTE:

      When a normally operating O2 Sensor is heated to operating temperature the typical duty cycle percentage will be between 30 and 50 percent. The typical heater temperature will range between approximately 1200°F and 1400°F on the scan tool. If there is an issue with the O2 Sensor heater or circuitry the PCM will disable the heater driver and the duty cycle will be 0 percent. Any issues in the heater circuitry, even a small amount of resistance, should cause the temperature reading to be noticeably different.

      Is the O2 Sensor heater operating properly?

      Yes 

      • Go To  7

      No 

      • Go To  3
  3. CHECK THE O2 SENSOR 1/2 (Z909) GROUND CIRCUIT FOR HIGH RESISTANCE BY LOAD TESTING THE CIRCUIT 
    1. Disconnect the component harness connector to isolate the ground circuit.
    2. Connect the positive lead of the load test tool to the positive side of the Battery.
    3. Connect the negative lead of the load test tool to the ground circuit at the component harness connector (A). Note:  refer to the diagram below.
    4. The bulb on the load test tool should be illuminated and bright if there is no resistance in the circuitry.
    NOTE:

    Why load test a circuit?  A load test is used to determine if a circuit is capable of carrying the amperage needed to perform properly. The 3156 bulb in the load tool illustrated, is a simple but effective method of testing circuit functionality. A 3156 Bulb has approximately 6.0 Ohms of resistance when the bulb is powered  and draws approximately 2.0 amps of current. Read the CIRCUIT LOAD TESTING PROCEDURE for information on building a simple load test tool and for additional load testing information and alternative methods of load testing or voltage drop testing a circuit. Refer to CIRCUIT TESTING PROCEDURES .

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.