SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSJEEP2024GRAND CHEROKEE L LIMITED, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 22 (5.7L - DTCS P0155 TO P0175)DTC TROUBLESHOOTINGP0161-O2 SENSOR 2/2 HEATER PERFORMANCEDIAGNOSTIC TEST
2024 Jeep Grand Cherokee L Limited, RWD

Diagnostic Test

2024 Jeep Grand Cherokee L Limited, RWDSECTION Diagnostic Test
WARNING: This page is about a different variant/trim than selected.
  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. CHECK FOR AN ACTIVE CONDITION 
    1. Turn the ignition off.
      NOTE:

      Wait a minimum of eight minutes to allow the sensor to cool down before continuing. The sensor voltage should stabilize between 2.47 and 2.52 volts.

    2. Turn the ignition on.
    3. With a scan tool, actuate the Oxygen Sensor 2/2 heater control.
    4. With the scan tool, monitor the O2 Sensor 2/2 voltage for at least two minutes.

      Does the voltage stay above approximately 4.5 volts?

      Yes 

      • Go To  3

      No 

  3. CHECK FOR OTHER DTCS 
    1. With the scan tool, read and record DTCs on the repair order.

      Are there any other O2 Sensor Heater circuit DTCs active or pending?

      Yes 

      No 

      • Go To  4
  4. CHECK THE O2 SENSOR 2/2 HEATER ELEMENT RESISTANCE VALUE 
    1. Turn the ignition off.
      NOTE:

      Allow the O2 Sensor heater a few minutes to cool down from the heater test performed with the scan tool.

    2. Disconnect the O2 Sensor 2/2 harness connector.
    3. Measure the resistance of the O2 Sensor Heater Element inside the O2 Sensor. Measure between the O2 Heater Control circuit terminal and the O2 Heater ground circuit terminal.
      NOTE:

      If possible, it's best to measure the O2 Sensor 1/1 Heater Element resistance value at approximately 20°C (68°F). The resistance value will vary with different temperature values. If the O2 Sensor is obviously warmer or cooler than the recommended temperature, use the table below to estimate what the resistance range should be. The MAXIMUM allowable resistance would be 12.5 Ohms at 1000°C.

      Celsius Fahrenheit Resistance Range
      0°C 32°F 3.1 - 4.2 Ohms
      20°C 68°F 3.3 - 4.4 Ohms
      100°C 212°F 3.85 - 5.1 Ohms

      Is the O2 Sensor resistance within the acceptable range?

      Yes 

      • Go To  5

      No 

      • Verify that there is good pin to terminal contact in the O2 Sensor 2/2 and Powertrain Control Module connectors. If OK, replace the O2 Sensor 2/2. Refer to OXYGEN SENSOR .
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. ISOLATE AND LOAD TEST THE O2 SENSOR 2/2 (K399) HEATER CONTROL CIRCUIT TO CHECK FOR HIGH RESISTANCE 
    1. The ignition must be off when performing a load test on a circuit.
    2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and every component harness connector containing the circuit being tested.
    3. Connect the positive lead of the load test tool to the positive side of the Battery (A). Note:  Refer to the diagram below.
    4. Using an approved back probe tool, connect the negative lead of the load test tool to the circuit being tested at the one of the component harness connectors (B).
    5. Using an approved back probe tool and a fused jumper wire, connect the circuit being tested to the negative side of the Battery or a known good ground at the other component harness connector (C and D).
    6. The bulb on the load test tool should be illuminated and bright if there is no resistance in the circuit.
      NOTE:

      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 LOAD TESTING PROCEDURES .

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.