DTC P0112[L3]

id0102a2803700

DTC P0112

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 0.16 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 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

•  Poor connection at MAF/IAT sensor or PCM connector

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

•  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 that the IAT sensor voltage is below 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 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 • Poor connection at MAF/IAT sensor or PCM connector • Short to ground in wiring harness between MAF/IAT sensor terminal D and PCM terminal 1AH • Short each wiring harness IAT signal circuit and IAT ground circuit • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME 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[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 (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 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 (wiring harness-side). • Is there continuity?	Yes	Repair or replace the wiring harness for a short, then go to Step 7.
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[L3].)
7		No	Go to the next step.
8	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE[L3].) • Are any DTC present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE[L3].)
8		No	Troubleshooting completed.