SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSJEEP2014GRAND CHEROKEE LAREDO, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 23 (5.7L - DTCS P000B TO P0298)DIAGNOSIS AND TESTINGP0158-O2 SENSOR 2/2 CIRCUIT HIGHDIAGNOSTIC TEST
2014 Jeep Grand Cherokee Laredo, AWD

Diagnostic Test

2014 Jeep Grand Cherokee Laredo, AWDSECTION Diagnostic Test
WARNING: This page is about a different variant/trim than selected.
  1. ACTIVE DTC 
    NOTE:

    If an O2 sensor signal circuit is shorted to voltage, all O2 sensor voltage readings displayed on the scan tool will be approximately 5.0 Volts. Diagnose the sensor that set the most current DTC.

    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, select View DTCs.

      Is the DTC Active at this time?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (K243) O2 SENSOR 2/2 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 1: Checking O2 Sensor Signal Circuit For Short To Voltage
    GC0090690Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Disconnect the O2 Sensor 2/2 harness connector.
    4. Turn the ignition on.
    5. Measure the voltage on the (K243) O2 Sensor 2/2 Signal circuit in the O2 Sensor 2/2 harness connector.
      NOTE:

      Measure the voltage in reference to ground, not the (K904) O2 Sensor 2/2 Return circuit.

      Is there any voltage present?

      Yes 

      • Repair the (K243) O2 Sensor 2/2 Signal circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (K904) O2 SENSOR 2/2 RETURN CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 2: Checking O2 Sensor Return Circuit For Short To Voltage
    GC0090691Courtesy of CHRYSLER GROUP, LLC
    1. Measure the voltage on the (K904) O2 Sensor 2/2 Return circuit in the O2 Sensor 2/2 harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (K904) O2 Sensor 2/2 Return circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. O2 SENSOR 
    Fig 3: Checking Oxygen Sensor Circuit
    GC0090692Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Connect the PCM C2 harness connectors.
    3. Ignition on, engine not running.
    4. With the scan tool, monitor the O2 Sensor 2/2 voltage.
    5. Connect a jumper between the (K243) O2 Sensor 2/2 Signal circuit and the (K904) O2 Sensor 2/2 Return circuit in the O2 Sensor 2/2 harness connector.

      Is the voltage between 2.3 and 2.7 volts with the jumper installed?

      Yes 

      • 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 SENSOR, OXYGEN, REMOVAL .
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
        NOTE:

        Remove the jumper before continuing.

  5. CHECK THE (K243) O2 SENSOR 2/2 SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
      CAUTION:

      Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.

    3. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
    4. Measure the resistance of the (K243) O2 Sensor 2/2 Signal circuit from the O2 Sensor 2/2 harness connector to the GPEC Adaptor.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (K243) O2 Sensor 2/2 Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK THE (K904) O2 SENSOR 2/2 RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K904) O2 Sensor 2/2 Return circuit from the O2 Sensor 2/2 harness connector to the GPEC Adaptor.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (K904) O2 Sensor 2/2 Return circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor 2/2 and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Oxygen Sensor 2/2 and Powertrain Control Module connectors.
    4. Perform any Technical Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No 

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.