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HOMESERVICE MANUALSDODGE AND RAM2024PROMASTER 1500 SLT+REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM3.6L - DTCS P0141 TO P0171DTC TROUBLESHOOTINGP0158 O2 SENSOR 2/2 CIRCUIT HIGHDIAGNOSTIC TEST
2024 Dodge and Ram ProMaster 1500 SLT+

Diagnostic Test

2024 Dodge and Ram ProMaster 1500 SLT+SECTION 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 2/2 signal voltage.

      Is the voltage staying above 4.0 volts?

      Yes 

      • Go To  2

      No 

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

      The duty cycle percentage and heater temperature should be relatively close to the other sensors. 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, will cause the temperature reading to be noticeably different than the other O2 Sensors. 

      Is the O2 Sensor heater operating properly?

      Yes 

      • Go To  7

      No 

      • Go To  3
  3. CHECK THE O2 SENSOR 2/2 (Z916) GROUND CIRCUIT FOR HIGH RESISTANCE BY LOAD TESTING THE CIRCUIT 
    NOTE:

    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  . 

    1. Turn the ignition off.
    2. Disconnect the O2 Sensor 2/2 harness connector.
      CAUTION:

      Do not load test any circuits with components still connected to the circuit.

    3. Load test the O2 Sensor 2/2 (Z916) Ground circuit at the O2 Sensor 2/2 harness connector (A). Note:  refer to the diagram below.
      NOTE:

      The bulb on the load test tool should be illuminated and bright if there is no resistance in the circuitry. Compare the brightness of the bulb in the load test tool to that of a direct connection across Battery. 

      GC0174957Courtesy of CHRYSLER GROUP, LLC

      Is the load test bulb illuminated and bright?

      Yes 

      • Go To  4

      No 

      • Repair the O2 Sensor 2/2 (Z916) Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  4. CHECK THE O2 SENSOR 2/2 (K399) HEATER CONTROL CIRCUIT FOR A SHORT TO ANOTHER VOLTAGE SUPPLY CIRCUIT 
    1. 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.

    2. Connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM connector.
    3. Check for continuity between the O2 Sensor 2/2 (K399) Heater Control circuit and all other circuits at the GPEC Adaptor.

      Is there continuity between the O2 Sensor 2/2 (K399) Heater Control circuit and any other circuit?

      Yes 

      • Repair the O2 Sensor 2/2 (K399) Heater Control circuit for a short to the circuit that showed continuity.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE O2 SENSOR 2/2 (K399) HEATER CONTROL CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the O2 Sensor 2/2 (K399) Heater Control circuit at the GPEC Adaptor.

      Is there continuity between ground and the O2 Sensor 2/2 (K399) Heater Control circuit?

      Yes 

      • Repair the O2 Sensor 2/2 (K399) Heater Control circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. ISOLATE AND LOAD TEST THE O2 SENSOR 2/2 (K399) HEATER CONTROL CIRCUIT TO CHECK FOR HIGH RESISTANCE 
    NOTE:

    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  . 

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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.