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Home >> GMC >> 1999 >> Forward Control 6.5 F, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P0100-P0134 >> DTC P0113 >> DTC P0113: IAT Sensor Circuit-Low Temperature (1.9L SATURN) >> Diagnostic Procedures

Diagnostic Procedures

  1. Turn ignition on. Connect scan tool and monitor IAT sensor reading. If IAT reading is less than 22°F (30°C), go to next step. If IAT sensor reading is not less than 22°F (30°C), problem is intermittent. See DIAGNOSTIC AIDS .
  2. Disconnect IAT sensor harness connector. Using a fused jumper wire, jumper terminals together at IAT sensor harness connector. If IAT reading is greater than 266°F (130°C), replace IAT sensor. If IAT reading is not greater than 266°F (130°C), go to next step.
  3. Remove jumper wire, and then jumper IAT signal circuit to ground. If IAT reading is greater than 266°F (130°C), go to next step. If IAT reading is not greater than 266°F (130°C), go to step  5.
  4. Using DVOM, check for continuity in IAT sensor ground circuit between IAT sensor and PCM. If continuity is present, connections or PCM is faulty. If continuity is not present, repair open ground circuit.
  5. Turn ignition off. Disconnect PCM harness connectors. Using DVOM, check for continuity in IAT sensor signal circuit between IAT sensor and PCM. If continuity is present, connections or PCM is faulty. If continuity is not present, repair open signal circuit.
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