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Home >> Cadillac >> 1996 >> Eldorado Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0111 - IAT Sensor Circuit Performance >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. If DTC P0112 or P0113 is also present, diagnose affected DTC(s) first. If other DTC(s) are not present, go to next step.
  3. Turn ignition on. Using scan tool, select FAILURE RECORD in DTC mode and note IAT snapshot display. If snapshot reading is less than -29°F (-34°C), go to next step. If snapshot reading is greater than -29°F (-34°C), go to step 5).
  4. An intermittent high resistance reading occurred on IAT sensor circuit. Check for open in IAT ground circuit and IAT signal circuit. Repair as necessary. If circuits are okay, go to step 7).
  5. If snapshot IAT sensor reading is greater than 291°F (144°C), go to next step. If reading is less than 291°F (144°C), go to step 7).
  6. An intermittent low resistance reading occurred on the IAT sensor circuit. Check for possible short to ground in IAT sensor signal circuit. Repair as necessary. If circuit is okay, go to next step.
  7. Artificially raise IAT temperature, from cool to warm. As IAT sensor warms, watch IAT sensor reading on scan tool. Look for a skip or jump in the value. If a skip or jump is noted, go to next step. If value did not skip or jump, see DIAGNOSTIC AIDS.
  8. Replace IAT sensor.
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