DTC P0112 [L3]

BME010200100W07

DTC P0112

IAT circuit low input

DETECTION CONDITION

• PCM monitors IAT sensor signal at PCM terminal 2E. If PCM detects IAT sensor voltage below 0.15 V, the PCM determines that IAT sensor circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction condition during first drive cycle.
• PENDING CODE is available if PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• IAT sensor malfunction
• Connector or terminal malfunction
• Short to ground circuit between MAF/IAT sensor terminal D and PCM terminal 2E
• Short each harness IAT signal circuit and IAT ground circuit.
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
• Is same DTC present?
Yes
Go to next step.
No
Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
INSPECT IAT SENSOR TERMINAL
• Turn ignition key to OFF.
• Disconnect 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 terminal, then go to Step 6.
No
Go to next step.
3
CLASSIFY IAT SENSOR MALFUNCTION OR HARNESS MALFUNCTION
• Connect WDS or equivalent to DLC-2.
• Access IAT PID.
• Verify IAT value when disconnecting MAF/IAT sensor connector.
• Does IAT value change?
Yes
Replace MAF/IAT sensor, then go to Step 6.
No
Go to next step.
4
INSPECT IAT SIGNAL CIRCUIT FOR SHORT TO GROUND
• Turn ignition key to OFF.
• Inspect continuity between MAF/IAT sensor terminal D (harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace harness for short to ground, then go to Step 6.
No
Go to next step.
5
INSPECT IAT CIRCUITS FOR SHORT
• Inspect continuity between MAF/IAT sensor terminals D and E (harness-side).
• Is there continuity?
Yes
Repair or replace harness for short, then go to Step 6.
No
Go to next step.
6
VERIFY TROUBLESHOOTING OF DTC P0112 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Perform KOEO/KOER self-test.
• Is same DTC present?
Yes
Replace PCM, then go to next step.
No
Go to next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC troubleshooting.
No
Troubleshooting completed.