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DTC P0112 [L3 Turbo]

id0102b7803700

DTC P0112 | IAT circuit low input
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DETECTION CONDITION | • The PCM monitors the IAT sensor signal. If the PCM detects on IAT sensor voltage below 0.06 V, the PCM determines that the IAT sensor circuit has a malfunction. Diagnostic support note • This is a continuous monitor (CCM). • MIL illuminates if the PCM detects the above malfunction condition during first drive cycle. • FREEZE FRAME DATA is available. • DTCs are stored in the PCM memory.
POSSIBLE CAUSE | • IAT sensor malfunction • Poor connection at the MAF/IAT sensor or PCM connector • Short to ground between MAF/IAT sensor terminal D and PCM terminal 2V • Short to each harness IAT signal circuit and IAT ground circuit. • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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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.
No | Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR 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 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.
No | Go to the next step.
4 | CLASSIFY IAT SENSOR MALFUNCTION OR HARNESS MALFUNCTION • Connect the WDS or equivalent to DLC-2. • Access the IAT PID. • Verify the IAT value when disconnecting the MAF/IAT sensor connector. • Does the IAT value change? | Yes | Replace the MAF/IAT sensor, then go to Step 7.
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 (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.
No | Go to the next step.
6 | INSPECT IAT CIRCUITS FOR SHORT • Inspect for continuity between MAF/IAT sensor terminals D and E (harness-side). • Is there continuity? | Yes | Repair or the replace harness for a short, then go to Step 7.
No | Go to the next step.
7 | VERIFY TROUBLESHOOTING OF DTC P0112 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn ignition switch to the ON position (Engine off). • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine and warm it up completely. • Is same DTC present? | Yes | Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L3 Turbo].)
No | Go to the next step.
8 | VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3 Turbo].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L3 Turbo].)
No | Troubleshooting completed.