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Home >> Chevrolet >> 1999 >> Forward Control P12 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P0100-P0134 >> DTC P0112 >> DTC P0112: IAT Sensor Circuit-High Temperature (1.9L SATURN) >> Diagnostic Procedures

Diagnostic Procedures

  1. Turn ignition on. Using scan tool, monitor IAT sensor reading. If IAT sensor reading is greater than 257°F (125°C), go to next step. If IAT sensor reading is not greater than 257°F (125°C), problem is intermittent. See DIAGNOSTIC AIDS .
  2. Disconnect IAT sensor harness connector. Using scan tool, monitor IAT sensor reading. If IAT sensor reading is less than -22°F (-30°C), replace IAT sensor. If IAT sensor reading is not less than -22°F (-30°C), go to next step.
  3. Turn ignition off. Disconnect PCM harness connector J2. Turn ignition on. Using scan tool, monitor IAT sensor reading. If IAT sensor reading is less than -22°F (-30°C), go to next step. If IAT sensor reading is not less than -22°F (-30°C), replace PCM.
  4. Repair short to ground or short to IAT sensor ground circuit in IAT sensor signal circuit between IAT sensor and PCM.
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