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Home >> Suzuki >> 2003 >> Vitara 4D Utility, 4WD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0111: Intake Air Temperature Sensor Circuit - Range/Performance >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

NOTE: For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
NOTE: Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.
  1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform A-4: ENGINE SYSTEM CHECK  under SYSTEM TESTS, then go to next step.
  2. Turn ignition switch to LOCK position. Disconnect IAT sensor 2-pin harness connector C31, located on air cleaner box. See Figure . Check IAT sensor and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If connector terminals are okay, perform IAT sensor component test. See INTAKE AIR TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. If IAT sensor is okay, go to next step. If IAT sensor is faulty, replace IAT sensor. See INTAKE AIR TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeatDTC CONFIRMATION TEST  .
  3. Disconnect ECM 26-pin harness connector C51-3, located under instrument panel, behind glove box. See Figure . Check ECM sensor and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If connector terminals are okay, check for excessive resistance in Light Blue wire and Blue/White wire between ECM and IAT sensor. If excessive resistance is found, repair as necessary and repeat DTC CONFIRMATION TEST  . If excessive resistance is not found, substitute ECM with a known good unit and repeat DTC CONFIRMATION TEST  .
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