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Home >> Mazda >> 2006 >> MX-5 Miata Base >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System] >> DTC P0112 >> Diagnostic Procedure
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Diagnostic Procedure

DTC P0112 DIAGNOSTIC PROCEDURE TABLE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED 
  • Has FREEZE FRAME DATA been recorded?
 Yes Go to the next step.
No Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins and/or on-line repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnosis according to the available repair information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 INSPECT IAT SENSOR TERMINAL 
  • Turn the ignition switch off.
  • Disconnect the MAF/IAT sensor connector.
  • Inspect for bent terminal of MAF/IAT sensor terminals D and E (part-side).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 7.
No Go to the next step.
4 CLASSIFY IAT SENSOR MALFUNCTION OR WIRING HARNESS MALFUNCTION 
  • Connect the WDS or equivalent to DLC-2.
  • Access IAT PID.
  • Verify IAT value when disconnecting the MAF/IAT sensor connector.
  • Does IAT value change?
 Yes Replace the MAF/IAT sensor, then go to Step 7.
(See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION .)
No Go to the next step.
5 INSPECT IAT SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND 
  • Turn the ignition switch off.
  • Disconnect the PCM connector.
  • Inspect for continuity between MAF/IAT sensor terminal D (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace the wiring harness for a short to ground, then go to Step 7.
No Go to the next step.
6 INSPECT IAT SENSOR SIGNAL AND GROUND CIRCUITS FOR SHORT EACH OTHER 
  • Inspect for continuity between MAF/IAT sensor terminals D and E (wiring harness-side).
  • Is there continuity?
 Yes Repair or replace the wiring harness for a short, then go to Step 7.
No Go to the next step.
7 VERIFY TROUBLESHOOTING OF DTC P0112 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Start the engine.
  • Is same DTC present?
 Yes Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION .)
No Go to the next step.
8 VERIFY AFTER REPAIR PROCEDURE  Yes Go to the applicable DTC troubleshooting.
(See DTC TABLE  .)
No Troubleshooting completed.
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