LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 334 (Charging System - Generators & Regulators) >> Diagnostic Tests >> DTC P0072: Ambient Temp Sensor Low >> Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P0072: Ambient Temp Sensor Low: Testing

WARNING: This page is about a different car, the 2004 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition on, engine not running. With the DRBIII(R), read the Ambient Air Temperature Sensor voltage. If the voltage is below 0.3 volt, go to next step. If the voltage is not below 0.3 volt, go to INTERMITTENT CONDITIONS  . Perform POWERTRAIN VERIFICATION TEST VER-5 (NGC)  .
  2. Turn the ignition off. Disconnect the Ambient Air Temperature Sensor harness connector. Turn the ignition on, engine not running. With the DRBIII(R), read Ambient Air Temperature Sensor voltage. If the voltage is above 1.0 volt, replace the Ambient Air Temperature Sensor. Perform POWERTRAIN VERIFICATION TEST VER-5 (NGC)  . If the voltage is not above 1.0 volt, go to next step.
  3. Turn the ignition off. Disconnect the Ambient Air Temperature Sensor harness connector. Disconnect the PCM harness connector. Measure the resistance between ground and the (K25) AAT Signal circuit in the Ambient Air Temperature Sensor harness connector. If the resistance is below 100 ohms, repair the short to ground in the (K145) AAT Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER-5 (NGC)  . If the resistance is not below 100 ohms, go to next step.
  4. Turn the ignition off. Disconnect the Ambient Air Temperature Sensor harness connector. Disconnect the PCM harness connector. Measure the resistance between the (K25) AAT Signal circuit and the (K4) Sensor ground circuit in the Ambient Air Temperature Sensor harness connector. If the resistance is below 100 ohms, repair the (K4) Sensor ground shorted to the (K25) AAT Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER-5 (NGC)  . If the resistance is not below 100 ohms, go to next step.
    5. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  5. If there are no possible causes remaining, replace and program the Powertrain Control Module. See PROGRAMMING  . Perform POWERTRAIN VERIFICATION TEST VER-5 (NGC)  .
scientia non olet · About LEMON Manuals