DTC P0112

id010200803700

DTC P0112

IAT circuit low input

DETECTION CONDITION

• The PCM monitors the IAT sensor signal at PCM terminal 2AQ. If the PCM detects that the IAT sensor voltage is less than 0.16 V, 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 the first drive cycle.
• The PENDING CODE is available if the PCM detects the above malfunction condition.
• The FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• IAT sensor malfunction
• Short in to ground circuit between MAF/IAT sensor terminal D and PCM terminal 2AQ
• Short each wiring harness IAT signal circuit and IAT ground circuit
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform the DTC CONFIRMATION PROCEDURE.
• Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
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 6.
No
Go to the next step.
3
CLASSIFY IAT SENSOR MALFUNCTION OR WIRING HARNESS MALFUNCTION
• Connect the WDS or equivalent 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 6.
No
Go to the next step.
4
INSPECT IAT SIGNAL CIRCUIT FOR SHORT TO GROUND
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect the 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 6.
No
Go to the next step.
5
INSPECT IAT CIRCUITS FOR SHORT
• Inspect the continuity between MAF/IAT sensor terminals D and E (wiring harness-side).
• Is there continuity?
Yes
Repair or replace the wiring harness for short, then go to Step 6.
No
Go to the next step.
6
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.
• Perform the KOEO/KOER self-test.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to applicable DTC troubleshooting.
(See DTC TABLE.)
No
Troubleshooting completed.