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DTC P0112: IAT Sensor Input Low: Testing

NOTE: Ensure freeze frame data has been recorded. Check for service bulletins and on-line information.
  1. Connect scan tool. Turn ignition on. Check IAT V PID. If PID is less than .2 volt, go to next step. If PID is .2 volt or more, problem is not present. Check for intermittent problem. See TROUBLE SHOOTING - NO CODES article.
  2. Disconnect MAF/IAT sensor. Check MAF/IAT sensor connector terminals. If connectors are okay, go to next step. If connectors are faulty, repair as necessary and go to step  6 .
  3. Turn ignition on. Using scan tool, check IAT V PID. If PID is less than .2 volt, go to next step. If PID is .2 volt or more, replace MAF/IAT sensor and go to step  6 .
  4. Turn ignition off. Disconnect PCM connector. PCM is mounted to passenger floor, behind glove box. Check continuity between MAF/IAT sensor harness connector terminal "F" (Purple wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground and go to step  6 .
  5. Check continuity between sensor harness connector terminals "A" and "F". If continuity is not present, go to next step. If continuity is present, repair short between circuits. After repair, go to next step.
  6. Reconnect all components. Turn ignition on. Using scan tool, clear DTC. Start engine. Recheck DTCs. If DTC P0112 is present, replace PCM and go to next step. If DTC P0112 is not present, go to next step.
  7. Perform after repair procedure. See AFTER REPAIR PROCEDURE  . If no DTC is present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.
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