DTC P0112 [L8, LF]

id0102b1803700

DTC P0112 | IAT sensor circuit low input
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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. • FREEZE FRAME DATA (Mode 2/Mode 12) 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 1AT • PCM connector or terminals malfunction • IAT sensor signal circuit and ground circuit are shorted to each other • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA (MODE 12) HAS BEEN RECORDED • Has the FREEZE FRAME DATA (Mode 12) been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA (Mode 12) 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 AND TERMINALS • Turn the ignition switch off. • Disconnect the MAF/IAT sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction? | Yes | Repair or replace the connector or terminals, then go to Step 8.
No | Go to the next step.
4 | CLASSIFY IAT SENSOR MALFUNCTION OR WIRING HARNESS MALFUNCTION • Reconnect the MAF/IAT sensor connector. • Connect the M-MDS to the DLC-2. • Perform the PID/DATA Monitor and Record Procedure and access the IAT PID. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) • Verify the IAT PID value when disconnecting the MAF/IAT sensor connector. • Does the IAT value change? | Yes | Replace the MAF/IAT sensor, then go to Step 8. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
5 | INSPECT IAT SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND • MAF/IAT sensor connector is disconnected. • Turn the ignition switch off. • 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 PCM internal circuit). (See PCM REMOVAL/INSTALLATION [L8, LF].) Go to Step 8.
No | Go to the next step.
6 | INSPECT PCM CONNECTOR AND TERMINALS • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction? | Yes | Repair or replace the connector or terminals, then go to Step 8.
No | Go to the next step.
7 | INSPECT IAT SENSOR SIGNAL AND GROUND CIRCUITS FOR SHORT TO EACH OTHER • MAF/IAT sensor and PCM connectors are disconnected. • Inspect for continuity between MAF/IAT sensor terminals D and E (wiring harness-side). • Is there continuity? | Yes | Repair or replace the suspected wiring harness, 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 [L8, LF].) • Start the engine and warm it up completely. • Perform the KOEO/KOER self test. (See KOEO/KOER SELF TEST [L8, LF].) • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
9 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF].) • Are any DTCs present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF].)
No | DTC troubleshooting completed.