Chevrolet Trax: DTC P0112, P0113, OR P0114
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptors
DTC P0112
Intake Air Temperature (IAT) Sensor Circuit Low Voltage
DTC P0113
Intake Air Temperature (IAT) Sensor Circuit High Voltage
DTC P0114
Intake Air Temperature (IAT) Sensor Circuit Intermittent
Diagnostic Fault Information
IAT Sensor 1
Typical Scan Tool Data
IAT Sensor 1
Circuit/System Description
The sensors listed below are integrated within the multifunction intake air
sensor:
- IAT sensor 1
- IAT sensor 2
- Humidity sensor
- MAF sensor
- BARO pressure sensor
The intake air temperature (IAT) sensor 1 is a variable resistor that changes
the voltage on the engine control
module (ECM) supplied 5 V signal circuit. The signal varies with inlet air
temperature in the sensor bore and is
displayed by the scan tool as ºC (ºF).
The IAT sensor 1 produces an analog signal on pin-8 of the sensor. The IAT
sensor 2 produces a frequency
modulated signal on pin-1 of the sensor.
The sensors listed below share an ECM supplied 5 V reference circuit:
- IAT sensor 2
- Humidity sensor
- BARO pressure sensor
The sensors listed below share an ECM supplied low reference circuit:
- IAT sensor 1
- IAT sensor 2
- Humidity sensor
- Barometric pressure (BARO) sensor
IAT Sensor 1 - Temperature, Resistance, Voltage Table
Conditions for Running the DTCs
P0112, P0113, and P0114
- The ignition is ON, or the engine is running.
- The DTCs run continuously when the above conditions are met.
Conditions for Setting the DTCs
P0112
The ECM detects that the IAT sensor signal is warmer than 149ºC (300ºF) for
at least 5 s.
P0113
NOTE: The scan tool display range is between -40 and +150ºC (-40
and +302ºF).
The ECM detects that the IAT sensor signal is colder than -60ºC (-76ºF) for
at least 5 s.
P0114
The ECM detects that the IAT sensor signal is intermittent or has abruptly
changed for at least 5 s.
Action Taken When the DTCs Set
- DTCs P0112, P0113, and P0114 are Type B DTCs.
- The ECM commands the cooling fans ON.
Conditions for Clearing the DTCs
DTCs P0112, P0113, and P0114 are Type B DTCs.
Diagnostic Aids
With the ignition ON, when the engine is cold and not running, a properly
functioning IAT sensor 1 will
gradually increase the scan tool IAT Sensor 1 parameter. This is due to the heat
that is generated by the
multifunction intake air sensor internal heating elements.
Reference Information
Schematic Reference
Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) ,
Powertrain Diagnostic Trouble
Code (DTC) Type Definitions (2H0)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) ,
Powertrain Diagnostic Trouble
Code (DTC) Type Definitions (2H0)
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON.
- Verify that DTC DTC P0641, P0651, P0697, or P06A3 is not set.
- If any of the DTCs are set
Refer to DTC P0641, P0651, P0697, or P06A3 (ECM) for further diagnosis.
- If none of the DTCs are set
NOTE:
To minimize the effects of residual engine heat and sensor internal
heating
elements, perform Steps 3 and 4 of this verification procedure only if the
ignition has been OFF for 8 hours or more.
- Ignition ON.
- Verify the following scan tool parameters are within 25ºC (45ºF) of each
other.
- Start-Up IAT Sensor 1
- IAT Sensor 2
- IAT Sensor 3; where equipped
- If not within 25ºC (45ºF)
Refer to Circuit/System Testing.
- Engine idling, verify the following scan tool parameters are between:
-38 and +149ºC (-36 and +300ºF).
- IAT Sensor 1
- IAT Sensor 2
- IAT Sensor 3; where equipped
- If not between: -38 and +149ºC (-36 and +300ºF)
Refer to Circuit System Testing.
- If between: -38 and +149ºC (-36 and +300ºF)
- Operate the vehicle within the conditions for running the DTC.
You may also operate the vehicle within
the conditions that you observed from the freeze frame/failure records data.
- Verify the DTC does not set.
Refer to Circuit/System Testing.
- All OK
Circuit/System Testing
NOTE:
You must perform the Circuit/System Verification before proceeding with
Circuit/System Testing.
- Ignition OFF, and all vehicle systems OFF, it may take up to 2 min. for
all vehicle systems to power
down. Disconnect the harness connector at the B75C Multifunction Intake Air
sensor.
- Test for less than 2 ohms between the low reference circuit terminal 7
and ground.
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module.
- Test for less than 2 ohms in the low reference circuit end to end.
- If 2 ohms or greater, repair the open or high resistance in the circuit.
- If less than 2 ohms replace the K20 Engine Control Module.
- If less than 2 ohms
- Ignition ON, test for 4.8-5.2 V between signal circuit terminal 8 and
ground.
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module.
- Test for infinite resistance between the signal circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance
- Test for less than 2 ohms in the signal circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K20 Engine Control Module.
- If greater than 5.2 V
NOTE: If the signal circuit is shorted to a voltage the
engine control module
or the sensor may be damaged.
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module.
- Ignition ON, test for less than 1 V between the signal circuit and
ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K20 Engine Control Module.
- If between 4.8-5.2 V
- Ignition ON, verify the scan tool IAT Sensor 1 parameter is colder than
-39ºC (-38ºF).
- If warmer than -39ºC (-38ºF).
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module.
- Test for infinite resistance between the signal circuit terminal 8 and
ground
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance
- Test for less than 2 ohms in the signal circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K20 Engine Control Module.
- If colder than -39ºC (-38ºF).
- Ignition OFF, install a 3 A fused jumper wire between the signal circuit
terminal 8 and the low reference
circuit terminal 7.
- Verify the scan tool IAT Sensor 1 parameter is warmer than 148ºC
(298ºF).
- If colder than 148ºC (298ºF).
- Ignition OFF, remove the jumper wire, disconnect the harness connector
at the K20 Engine Control
Module, ignition ON.
- Test for less than 1 V between the signal circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V
- Ignition OFF.
- Test for less than 2 ohms in the signal circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K20 Engine Control Module.
- If warmer than 148ºC (298ºF).
- Test or replace the B75C Multifunction Intake Air sensor.
Component Testing
Multifunction Intake Air Sensor
- Ignition OFF, disconnect the harness connector at the B75C Multifunction
Intake Air sensor.
NOTE: A thermometer can be used to test the sensor off the vehicle.
- Test the IAT sensor 1 by varying the sensor temperature while monitoring
the sensor resistance. Compare
the readings with the Temperature Versus Resistance - Intake Air Temperature
Sensor (Bosch
Sensor) , Temperature Versus Resistance - Intake Air Temperature Sensor (Delco
Sensor) table for
Bosch Sensors. The resistance values should be in range of the table values.
- If not within the specified range.
Replace the B75C Multifunction Intake Air sensor.
- If within the specified range.
- All OK
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Mass Airflow Sensor Replacement for multifunction intake air sensor
replacement
- Control Module References for Engine Control Module replacement,
programming, and setup.
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
If a short in an injector coil winding is constant, an ohmmeter will
accurately identify the lower resistance. The
same is true with an open winding. Unfortunately, an intermittent short is an
exception. A faulty injector with
an intermittent short will show "good" if the ohmmeter cannot force the
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptor
DT