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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 452 (AIR CONDITIONING SYSTEM - DIAGNOSTICS)CIRCUIT INSPECTIONDTC 12: AMBIENT TEMPERATURE SENSOR CIRCUITINSPECTION PROCEDURE
2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure
WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check voltage between terminals TAM and E2 of ECM connector. 
    Fig 1: Locating ECM Terminals TAM & E2
    G01112340Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    PREPARATION

    1. Remove ECM with connectors still connected.
    2. Turn ignition switch ON.
      NOTE: As the temperature increases, the voltage decreases.

      Check:  voltage between terminals TAM and E2 of ECM connector at each temperature. If OK  , voltage at 25 °C (77 °F) : 1.35 - 1.75 V, at 40 °C (104 °F) : 0.85 - 1.25 V.

    1. NG: Go to step   2 . 
    2. If OK  , Proceed to next circuit inspection shown on problem symptoms table. See PROBLEM SYMPTOMS TABLE . However, if DTC 12 is displayed, check and replace A/C amplifier.
  2. Check ambient temperature sensor. 

    PREPARATION:  Disconnect ambient temperature sensor connector.

    NOTE: As the temperature increases, the resistance decreases.

    Check:  resistance between terminals 1 and 2 of ambient temperature sensor connector at each temperature. If OK  , Resistance at 25 °C (77 °F) : 1.6 - 1.8 kΩ, at 40 °C (104 °F) : 0.5 - 0.7 kΩ.

    Fig 2: Testing Ambient Temperature Sensor
    G01112341Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG:  Replace ambient temperature sensor.
    2. If OK  , Check multiplex communication system. See HOW TO PROCEED WITH TROUBLESHOOTING MULTIPLEX COMMUNICATION SYSTEM .
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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.