DTC P0112

BHE010200100W07

DTC P0112

IAT sensor circuit low input

DETECTION CONDITION

• The PCM monitors the input voltage from the IAT sensor when the engine is running. If the input voltage is less than 0.1 V, the PCM determines that the IAT sensor circuit input voltage is low.

Diagnostic support note

• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
• PENDING CODE is available if the PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• IAT sensor malfunction
• Connector or terminal malfunction
• Short to GND in wiring harness between MAF/IAT sensor terminal D and PCM terminal 5K
• PCM malfunction

Diagnostic procedure

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 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 MAF/IAT SENSOR CONNECTOR FOR POOR CONNECTION

• Turn the ignition switch off.
• Disconnect the MAF/IAT sensor connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 7.
No
Go to the next step.
4

INSPECT IAT SENSOR SIGNAL CIRCUIT FOR SHORT TO GND

• Turn the ignition switch off.
• Inspect for continuity between MAF/IAT sensor terminal D (wiring harness-side) and body GND.
• Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to GND, then go to Step 7.
No
Go to the next step.
5

INSPECT IAT SENSOR

• Inspect the IAT sensor.
• Is there any malfunction?
Yes
Replace the MAF/IAT sensor, then go to Step 7.
No
Go to the next step.
6

INSPECT PCM CONNECTOR FOR POOR CONNECTION

• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to the next step.
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 the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
8

VERIFY AFTER REPAIR PROCEDURE

• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE.)
No
DTC troubleshooting completed.