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DTC P0112

DTC P0112  IAT sensor circuit tow input 
DETECTION CONDITION 
  • The PCM monitors the IAT sensor signal. If the PCM detects that the IAT sensor voltage is below 0.16 V for 5s  , the PCM determines that the IAT sensor circuit has a malfunction.

Diagnostic support note 
  • This is a continuous monitor (CCM).
  • The MIL illuminates if the PCM detects the above malfunction condition during first drive cycle.
  • FREEZE FRAME DATA (Mode 2/Mode 12) is available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • MAF/IAT sensor connector or terminals malfunction
  • IAT sensor malfunction
  • Short to ground in wiring harness between MAF/IAT sensor terminal D and PCM terminal 1 AT
  • PCM connector or terminals malfunction
  • IAT sensor signal circuit and ground circuit are shorted to each other
  • PCM malfunction
G07877611
DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA (MODE 12) HAS BEEN RECORDED 
  • Has the FREEZE FRAME DATA (Mode 12) been recorded?
 Yes Go to the next step.
No Record the FREEZE FRAME DATA (Mode 12) on the repair order, then go to the next step.
2 VERIFY RELATED SERVICE BULLETINS AVAILABILITY 
  • Verify related Service Bulletins availability.
  • Is any related Service Bulletins available?
 Yes Perform the repair or diagnosis according to the available Service Bulletins.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 INSPECT MAF/IAT SENSOR CONNECTOR AND TERMINALS 
  • Turn the ignition switch off.
  • Disconnect the MAF/IAT sensor connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
  • Is there any malfunction?
 Yes Repair or replace the connector or terminals, then go to Step 8.
No Go to the next step.
4 CLASSIFY IAT SENSOR MALFUNCTION OR WIRING HARNESS MALFUNCTION 
  • Reconnect the MAF/IAT sensor connector.
  • Connect the M-MDS to the DLC-2.
  • Access the IAT PID.
  • Verify the IAT value when disconnecting the MAF/IAT sensor connector.
  • Does the IAT value change?
 Yes Replace the MAF/IAT sensor, then go to Step 8.
(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 
  • MAF/IAT connector is disconnected.
  • Inspect for continuity between MAF/IAT sensor terminal D (wiring harness-side) and body ground.
  • Is there continuity?
 Yes If the short to ground circuit could be detected:
  • Repair or replace the wiring harness for a possible short to ground.

If the short to ground circuit could not be detected:

Go to Step 8.
No Go to the next step.
6 INSPECT PCM CONNECTOR AND TERMINALS 
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
  • Is there any malfunction?
 Yes Repair or replace the connector or terminals, then go to Step 8.
No Go to the next step.
7 INSPECT IAT SENSOR SIGNAL CIRCUIT AND GROUND CIRCUIT FOR SHORT TO EACH OTHER 
  • MAF/IAT sensor and PCM connectors are disconnected.
  • 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 possible short to each other, then go to the next step.
No Go to the next step.
8 VERIFY TROUBLESHOOTING OF DTC P0112 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS.
  • Perform the KOEO or KOER self test.

    (See KOEO/KOER SELF TEST ).

  • Is the same DTC present?
 Yes Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION ).
No Go to the next step.
9 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No DTC troubleshooting completed.
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