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Home >> Suzuki >> 1999 >> Grand Vitara JS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0111: Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Ensure ignition is off. Disconnect IAT sensor harness connector. Check terminals of IAT sensor harness connector for poor contact. If poor terminal contact is found, repair as necessary and retest system. If connection is okay, remove IAT sensor from air cleaner and go to next step.
  2. Using an ohmmeter, measure resistance between IAT sensor terminals while immersed in a container of water. Heat water slowly and ensure resistance changes as specified. See Fig 1 . If resistance is as specified, go to next step. If resistance is not as specified, replace IAT sensor. See REMOVAL, OVERHAUL & INSTALLATION article. Retest system.
    Fig 1: Identifying Intake Air Temperature Sensor Resistance (Typical)
    G99F51057Courtesy of SUZUKI OF AMERICA CORP.
  3. Ensure IAT sensor is disconnected. Turn ignition on. Using DVOM, measure voltage at IAT sensor harness connector terminal No. 2 (Light Blue wire). If 4.5-5.5 volts exists, go to next step. If 4.5-5.5 volts does not exist, check for open in Light Blue wire between IAT sensor and PCM. See WIRING DIAGRAMS article. Repair as necessary. If Light Blue wire is okay, replace PCM. See REMOVAL, OVERHAUL & INSTALLATION article. Retest system.
  4. Check for open in Gray/Yellow wire between IAT sensor and PCM. Repair as necessary. If Gray/Yellow wire is okay, replace PCM. See REMOVAL, OVERHAUL & INSTALLATION article. Retest system.
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