DTC P0112:00 [L5]SM2444202
DTC P0112:00 [L5]

id0102c9701400

DTC P0112:00

IAT sensor circuit low input
DETECTION CONDITION
• The PCM monitors the IAT sensor signal. If the PCM detects that the IAT sensor voltage is below 0.1 V for 5 s, 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.
• FREEZE FRAME DATA (Mode 2)/Snapshot data 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 1AC
• PCM connector or terminals malfunction
• IAT sensor signal circuit and ground circuit are shorted to each other
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA HAS BEEN RECORDED
• Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT MAF/IAT SENSOR CONNECTOR CONDITION
• 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 connector and/or terminals, then go to Step 8.
No
Go to the next step.
4
VERIFY PID DATA FOR IAT SENSOR MALFUNCTION
• MAF/IAT sensor connector is disconnected.
• Access the IAT PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L5].)
• Verify and compare the IAT PID values when disconnecting and connecting MAF/IAT sensor connector.
• Does the IAT PID value change?
Yes
Replace the MAF/IAT sensor, then go to Step 8.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L5].)
No
Go to the next step.
5
INSPECT IAT SIGNAL CIRCUIT FOR SHORT TO GROUND
• Turn the ignition switch off.
• Disconnect the MAF/IAT sensor connector.
• 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:
• Replace the PCM (short to ground in the PCM internal circuit). (See PCM REMOVAL/INSTALLATION [L5].)
Go to Step 8.
No
Go to the next step.
6
INSPECT PCM CONNECTOR CONDITION
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the connector and/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
• Turn the ignition switch off.
• Disconnect the MAF/IAT sensor and PCM connectors.
• 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 DTC TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [L5].)
• Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [L5].)
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [L5].)
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L5].)
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [L5].)
No
DTC troubleshooting completed.