1990 Eagle Premier ESFACTORY OEM SERVICE PROCEDURE

Manifold Air Temperature (Mat) Sensor Test

  1. Disconnect wire harness connector from MAT sensor. The MAT sensor is installed in throttle body adapter, at rear of intake manifold. Using a DVOM, sensor resistance should be less than 1000 ohms with engine at operating temperature.
  2. Check resistance between ECU terminal "C8" and sensor connector, and ECU terminal "D3" and sensor connector. See Figure . Repair wiring harness if resistance is more than one ohm. Refer to MANIFOLD AIR TEMPERATURE SENSOR RESISTANCE  table. Replace sensor if not within specification.
    MANIFOLD AIR TEMPERATURE SENSOR RESISTANCE (1)

    °F (°C) Ohms
    212 (100) 185
    160 (70) 450
    100 (38) 1600
    70 (20) 3400
    40 (4) 7500
    20 (-7) 13,500
    0 (-18) 25,500
    -40 (-40) 100,700
    (1) Values given are approximate.
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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.

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