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P0071: Ambient/Battery Temp Sensor Performance: Testing

  1. Turn ignition on, engine not running. With the DRBIII(R), read DTC's and record the related Freeze Frame data. If the Good Trip Counter equals zero, go to next step. If the counter does not equal zero, see INTERMITTENT CONDITIONS  . Perform Verification Test VER-5. See VERIFICATION TEST VER-5  .
  2. Turn the ignition off. Disconnect the battery temp sensor harness connector. Turn the ignition on, engine not running. Measure the voltage on the (K25) battery temp signal circuit at the sensor connector. If the voltage is above 5.2 volts, repair the short to voltage on the (K25) batt temp signal circuit. Perform Verification Test VER-5. See VERIFICATION TEST VER-5  . If the voltage is not above 5.2 volts, go to next step.
  3. With the DRBIII(R), read the battery temp sensor voltage with the battery temp sensor still disconnected. If the voltage is above 4.6 volts, go to next step. If the voltage is not above 4.6 volts, go to step  7 .
  4. Connect a jumper wire between the (K25) battery temp signal circuit and the (K900) sensor ground circuit at the sensor harness connector. With the DRBIII(R), read the battery temp sensor voltage. If the voltage is below 1 volt, replace the battery temperature sensor. Perform Verification Test VER-5. See VERIFICATION TEST VER-5  . If the voltage is not below 1 volt, go to next step.
    5. NOTE: Remove the jumper wire before continuing.
    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.
  5. Turn the ignition off. Connect the battery temp sensor harness connector. Backprobe the (K25) 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. If the voltage is below .10 volt, go to the next step. If the voltage is not below .10 volt, repair the excessive resistance in the (K25) battery temp sensor signal circuit. Perform Verification Test VER-5. See VERIFICATION TEST VER-5  .
  6. Turn the ignition off. Backprobe the (K900) sensor ground circuit at the battery temperature sensor harness connector and the PCM harness connector using both voltmeter leads. Start the engine. Allow the engine to idle. If the voltage is below .10 volt, go to step  8 . If the voltage is not below .10 volt, repair the excessive resistance in the (K900) sensor ground circuit. Perform Verification Test VER-5. See 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 (K25) battery temp signal circuit. If the resistance is below 100 ohms, repair the short to ground in the (K25) battery temp signal circuit. Perform Verification Test VER-5. See VERIFICATION TEST VER-5  . If the resistance is not below 100 ohms, go to next step.
    8. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  8. Using wiring schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See POWERTRAIN CONTROL MODULE  . Perform Verification Test VER-5. See VERIFICATION TEST VER-5  .
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