Orlando

DTC P0111-P0113 - LNP or LNQ

The inlet air temperature (IAT) sensor 1 is an integral part of the mass air flow (MAF) sensor. The IAT sensor is a variable resistor that measures the temperature of the inlet air. The engine control module (ECM) supplies 5 V to the IAT signal circuit and supplies a ground to the low reference circuit.

The following table illustrates the difference between temperature, resistance, and voltage:

P0111 00

The ECM detects that the IAT 1 deviates less than 1.5°C (35°F) since engine start.

P0112 00

The ECM detects that an IAT 1 circuit is shorted to ground.

P0113 00

The ECM detects that an IAT 1 circuit is open or shorted to voltage.

DTCs P0111 00, P0112 00 and P0113 00 are Type B DTCs.

DTCs P0111 00, P0112 00 and P0113 00 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the DTC information with a scan tool. DTC P0111 00, P0112 00 or P0113 00 should not set.
2. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

1. Ignition OFF disconnect the harness connector at the B75B Mass Air Flow/Intake Air Temperature Sensor.
2. Test for less than 5 Ω between the low reference circuits and ground listed below:

•	Terminal 1 with LNP

•	Terminal B with LNQ

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance, or for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

3. Ignition ON, test for 4.8-5.2 V between the IAT signal circuits and ground listed below:

•	Terminal 3 with LNP

•	Terminal A with LNQ

⇒	If less than the specified range, test the signal circuit for an open or a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

4. If all circuits test normal, test or replace the B75B Mass Air Flow/Inlet Air Temperature Sensor.

Static Test

Test and record the resistance between the signal circuit terminals and the low reference circuit terminals listed below at various ambient temperatures. Compare those measurements to the Temperature Versus Resistance : Exhaust Temperature Sensor  → ECT and IAT Sensor table and verify that the resistance is within 5% of the specification.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.