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Home >> Jeep >> 2005 >> Wrangler X, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 627 (Powertrain Diagnostic Procedures - DRIVEABILITY - Gas - Symptom & Diagnostic Tests (DTCS P0031 To P1899)) >> DRIVEABILITY - Gas - Diagnostic Tests >> P0071-Ambient/Battery Temp Sensor Performance (Gas - Except NGC) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Dodge Pickup and 2004 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures.
  1. Ignition on, engine not running.

    With the DRBIII®, read DTCs and record the related Freeze Frame data.

    Is the Good Trip Counter equal to zero?

    1. Yes --> Go To 2
    2. No - Refer to the SYMPTOM: INTERMITTENT CONDITION  Symptom (Diagnostic Procedure).

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

  2. Turn the ignition off.

    Disconnect the Battery Temp Sensor harness connector.

    Ignition on, engine not running.

    Measure the voltage on the (K118) Battery Temp Signal circuit at the Sensor connector.

    Is the voltage above 5.2 volts?

    1. Yes --> Repair the short to voltage on the (K118) Batt Temp Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 3
  3. With the DRBIII®, read the Battery Temp Sensor voltage with the Batt Temp Sensor still disconnected.

    Is the voltage above 4.6 volts?

    1. Yes --> Go To 4
    2. No --> Go To 7
  4. Connect a jumper wire between the (K118) Battery Temp Signal circuit and the (K4) Sensor ground circuit at the Sensor harness connector.

    With the DRBIII®, read the Battery Temp Sensor voltage.

    Is the voltage below 1.0 volt?

    1. Yes --> Replace the Battery Temperature Sensor.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 5
    NOTE: Remove the jumper wire before continuing.
  5. Turn the ignition off.

    Connect the Battery Temp Sensor harness connector.

    NOTE: Ensure the voltmeter leads meet the terminals in the connector and that there is good terminal to wire connection.
    NOTE: Ensure the voltmeter leads are connected for positive polarity

    Backprobe the (K118) Battery Temp Sensor Signal circuit at the Sensor harness connector and the PCM harness connector with both voltmeter leads.

    Start the engine.

    Allow the engine to idle.

    Is the voltage below 0.10 of a volt?

    1. Yes --> Go To 6
    2. No --> Repair the excessive resistance in the (K118) Battery Temp Sensor Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

  6. Turn the ignition off.
    NOTE: Ensure the voltmeter leads meet the terminals in the connector and that there is good terminal to wire connection.
    NOTE: Ensure the voltmeter leads are connected for positive polarity

    Backprobe the (K4) Sensor ground circuit at the Battery Temperature Sensor harness connector and the PCM harness connector using both volt meter leads.

    Start the engine.

    Allow the engine to idle.

    Is the voltage below 0.10 of a volt?

    1. Yes --> Go To 8
    2. No --> Repair the excessive resistance in the (K4) Sensor ground circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

  7. Turn the ignition off.

    Disconnect the Battery Temp Sensor harness connector.

    Disconnect the PCM harness connectors.

    Measure the resistance between ground and the (K118) Battery Temp Signal circuit.

    Is the resistance below 100 ohms?

    1. Yes --> Repair the short to ground in the (K118) Battery Temp Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 8
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