DTC P0112[MTX, LF ATX (FS5A-EL)]

id0102b4803700

DTC P0112

IAT sensor circuit low input

DETECTION CONDITION

•  The PCM monitors the IAT sensor signal. If the PCM detects the IAT sensor voltage below 0.16 V, the PCM determines that the IAT sensor circuit has 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 is available.

•  DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  IAT sensor malfunction

•  Poor connection at MAF/IAT sensor or PCM connector

•  Short to ground in wiring harness between MAF/IAT sensor terminal D and PCM terminal 1AT

•  Short each wiring harness IAT signal circuit and IAT ground circuit

•  PCM malfunction

DTC P0112	IAT sensor circuit low input
DETECTION CONDITION	• The PCM monitors the IAT sensor signal. If the PCM detects the IAT sensor voltage below 0.16 V, the PCM determines that the IAT sensor circuit has 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 is available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE	• IAT sensor malfunction • Poor connection at MAF/IAT sensor or PCM connector • Short to ground in wiring harness between MAF/IAT sensor terminal D and PCM terminal 1AT • Short each wiring harness IAT signal circuit and IAT ground circuit • 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.
1		No	Record the FREEZE FRAME 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.
2		No	Go to the next step.
3	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 7.
3		No	Go to the next step.
4	CLASSIFY IAT SENSOR MALFUNCTION OR WIRING HARNESS MALFUNCTION • Connect the M-MDS to DLC-2. • Access IAT PID. • Verify IAT value when disconnecting the MAF/IAT sensor connector. • Does IAT value change?	Yes	Replace the MAF/IAT sensor, then go to Step 7. (See INTAKE AIR SYSTEM REMOVAL/INSTALLATION[LF, L3].)
4		No	Go to the next step.
5	INSPECT IAT SIGNAL CIRCUIT FOR SHORT TO GROUND • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for continuity between MAF/IAT sensor terminal D and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness for short to ground, then go to Step 7.
5		No	Go to the next step.
6	INSPECT IAT CIRCUITS FOR SHORT • Inspect for continuity between MAF/IAT sensor terminals D and E. • Is there continuity?	Yes	Repair or replace the wiring harness for short, then go to the next step.
6		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 M-MDS. • Start the engine. • Is same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION[LF, L3].)
7		No	Go to the next step.
8	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE[MTX, LF ATX (FS5A-EL)].) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE[MTX, LF ATX (FS5A-EL)].)
8		No	Troubleshooting completed.