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Home >> Chrysler >> 2007 >> Pacifica Limited, FWD >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0112 To P0151 >> P0141-O2 Sensor 1/2 Heater Performance >> Diagnostic Test

Diagnostic Test

  1. 1) 1/2 O2 SENSOR HEATER CONTROL OPERATION 
    NOTE: Allow the sensor to cool to ambient temperature before continuing. The voltage should stabilize between 4.6 and 5.0 volts.

    Turn the ignition on.

    With a scan tool, actuate the 1/2 O2 Sensor heater control.

    With the scan tool, monitor the 1/2 O2 Sensor voltage for at least 2 minutes.

    Does the voltage stay above 4.5 volts? 

    Yes 

    1. Go to  2).

    No 

    1. Refer to *CHECKING FOR AN INTERMITTENT DTC .
  2. 2) 1/2 O2 SENSOR 
    Fig 1: Measuring The Resistance Of The O2 Sensor Heater Element Across The 1/1 O2 Sensor Connector Between The Heater Control Terminal And The Ground Terminal
    GC0049368Courtesy of CHRYSLER LLC

    Turn the ignition off.

    NOTE: Allow the sensor to cool to ambient temperature before continuing. The voltage should stabilize between 4.6 and 5.0 volts.

    Disconnect the 1/2 O2 Sensor harness connector.

    Measure the resistance of the O2 sensor heater element across the 1/2 O2 Sensor connector between the heater control terminal and the ground terminal.

    NOTE: The resistance of the heater element will vary according to temperature and should be measured at 70° F (21.1° C).

    Is the resistance between 2.0 and 30.0 ohms? 

    Yes 

    1. Go to  3).

    No 

    1. Replace the 1/2 O2 Sensor in accordance with the Service Information.
    2. Perform PCM VERIFICATION TEST .
  3. 3) (K299) O2 1/2 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 2: Measuring The Resistance Of The O2 1/2 Heater Control Circuit Between The 1/2 O2 Sensor Harness Connector And The Appropriate Terminal Of Special Tool #8815
    GC0049373Courtesy of CHRYSLER LLC

    Disconnect the Powertrain Control Module (PCM) 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 Miller Special Tool #8815 to perform diagnosis.

    Measure the resistance of the (K299) O2 1/2 Heater Control circuit between the 1/2 O2 Sensor harness connector and the appropriate terminal of special tool #8815.

    Is the resistance below 0.5 ohms? 

    Yes 

    1. Go to  4).

    No 

    1. Repair the (K299) O2 1/2 Heater Control circuit for an open circuit or high resistance.
    2. Perform PCM VERIFICATION TEST .
  4. 4) (Z43) GROUND CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 3: Checking The Ground Circuit In The 1/1 O2 Sensor Harness Connector Using A 12 Volt Test Light Connected To 12 Volts
    GC0049372Courtesy of CHRYSLER LLC

    Using a 12 volt test light connected to 12 volts, check the (Z43) Ground circuit in the 1/2 O2 Sensor harness connector.

    NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

    Is the test light illuminated and bright? 

    Yes 

    1. Go to  5).

    No 

    1. Repair the (Z43) Ground circuit for an open circuit or high resistance.
    2. Perform PCM VERIFICATION TEST .
  5. 5) POWERTRAIN CONTROL MODULE (PCM) 

    Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the 1/2 O2 Sensor and the Powertrain Control Module (PCM).

    Look for any chafed, pierced, pinched, or partially broken wires.

    Look for broken, bent, pushed out or corroded terminals.

    Refer to any Technical Service Bulletins that may apply.

    Were any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
    2. Perform PCM VERIFICATION TEST .
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