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Home >> GMC >> 1987 >> Forward Control 7.4 W, Standard >> Repair and Diagnosis >> Engine Performance >> System >> CCC TBI Tests W/Codes >> Diagnostic Charts >> Code 25 - Mat Sensor (High Temp Indicated - 2.5L) >> Test Description

Test Description

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Code 25 will be set if the following conditions are met:
    • Signal voltage indicates manifold air temperature below 302°F (150°C) for 2 seconds.
    • Time since engine start is one minute or longer.
    • Vehicle speed sensor reading is present (vehicle moving).
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