Volt

DTC P0112, P0113, or P0114

The intake air temperature (IAT) sensor is integrated with the mass air flow (MAF) sensor. It is a variable resistor that measures the temperature of the air entering the engine. The IAT sensor has a signal circuit and a low reference circuit. The engine control module (ECM) supplies 5 volts to the IAT signal circuit and a ground for the IAT low reference circuit.

P0112 or P0113

P0114

P0112

The ECM detects that the IAT sensor signal is warmer than 149°C (300°F) for greater than 5 s.

P0113

Note: The scan tool display range is between -40 and + 150°C (-40 and +302°F).

The ECM detects that the IAT sensor signal is colder than -59°C (-72°F) for greater than 5 s.

P0114

The ECM detects that the IAT sensor signal is intermittent or has abruptly changed greater than 125°C (257°F) warmer or colder for greater than 5 s.

DTCs P0112, P0113 and P0114 are Type B DTCs.

DTCs P0112, P0113 and P0114 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Hybrid Modes of Operation Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Engine running, observe the scan tool IAT sensor parameter. The reading should be between -38 and +149°C (-36 and +300°F).
2. Operate the vehicle within the conditions for running the DTC to verify that 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. Vehicle OFF, disconnect the harness connector at the B75B mass air flow/inlet air temperature sensor.
2. Vehicle OFF, all systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the low reference circuit terminal 1 and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

3. Vehicle in Service Mode, verify the scan tool IAT Sensor parameter is colder than -39°C (-38°F).

⇒	If warmer than the specified range, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the K20 ECM.

Note: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the ECM or the sensor may be damaged.

4. Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool IAT Sensor parameter is warmer than 149°C (300°F).

⇒	If colder than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

5. If all circuits test normal, test or replace the B75B mass air flow/intake air temperature sensor.

1. Vehicle OFF, disconnect the harness connector at the B75B mass air flow/inlet air temperature sensor.

Note: A thermometer can be used to test the sensor off the vehicle.

2. Test the IAT sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature Versus Resistance . The resistance values should be in range of the table values.

⇒	If not within the specified range, B75B mass air flow/inlet air temperature sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.