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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 555 (AIR CONDITIONING SYSTEM - DIAGNOSTICS)CIRCUIT INSPECTIONDTC 31: FRONT AIR MIX DAMPER POSITION 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 2003 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check voltage between terminals TPD and SG of integration control and panel. 

    PREPARATION:

    Remove integration control and panel with connectors still connected.

    CHECK:

    1. Turn ignition switch to ON.
    2. Change the set temperature to activate the front air mix damper control servomotor, and measure the voltage between terminals TPD and SG of integration control and panel connector each time when the set temperature is changed.
      3. Fig 1: Checking Voltage Between Terminals TPD And SG Of Integration Control And Panel
      G02839077Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK:

    TEMPERATURE VOLTAGE

    Set Temperature Voltage
    Max. Cool 3.5 - 4.5 V
    Max. Hot 0.5 - 1.5 V
    NOTE: As the set temperature increases, the voltage decreases.
    1. NG : Go to step 2. 
    2. OK : Proceed to next circuit inspection shown in  PROBLEM SYMPTOMS TABLE  . However, if DTC 31 is displayed, check and replace integration control and panel. 
  2. Check front air mix damper position sensor. 

    PREPARATION:

    Remove front air mix servomotor (See INSPECTION ).

    CHECK:

    Measure resistance between terminals 3 and 4 of front air mix servomotor connector.

    OK:

    1. Resistance: 4.2 - 7.8 kΩ 

    CHECK:

    While operating front air mix servomotor, following the procedure, measure resistance between terminals 3 and 4 of front air mix servomotor connector.

    OK:

    POSITION RESISTANCE

    Position Resistance
    Max. Cool 3.6 - 6.8 kΩ
    Max. Warm 0.5 - 1.1 kΩ
    Fig 2: Checking Front Air Mix Damper Position Sensor
    G02839078Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
RENDER: 1.0x

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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.