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Home >> Mazda >> 2001 >> Protege MP3 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.0L >> Diagnostic Tests >> DTC P0112: Intake Air Temperature (IAT) Sensor Circuit, Low Input >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
  2. Turn ignition off. Disconnect IAT sensor. Inspect IAT sensor and harness connector terminals. If no problem is found, go to next step. If problem is found, repair as necessary and go to step  6 .
  3. Measure resistance between IAT sensor terminals. If resistance is 117-28,616 ohms, go to next step. If resistance is not as specified, replace IAT sensor and go to step  6 .
  4. Disconnect PCM connector. Check continuity between IAT sensor harness connector terminal "A" (Blue/White wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground in Blue/White wire between IAT and PCM connector terminal No. 39. See WIRING DIAGRAMS article. Go to step  6 .
  5. Check continuity between IAT sensor harness connector terminals. If continuity is not present, go to next step. If continuity is present, repair short between circuits. Go to next step.
  6. Reconnect all connectors. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0112 is present, replace PCM and go to next step. If DTC P0112 is not present, go to next step.
  7. Cycle ignition from off to on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.
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