DTC P0112, P0113, or P0114 (LUJ)
Diagnostic Instructions
DTC Descriptors
| DTC P0112 00: Intake Air Temperature (IAT)
Sensor Circuit Low Voltage |
| DTC P0113 00: Intake Air Temperature (IAT)
Sensor Circuit High Voltage |
| DTC P0114 00: Intake Air Temperature (IAT)
Sensor Circuit Intermittent |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
IAT Sensor Signal
|
P0112 00, P0114 00
|
P0113 00, P0114 00
|
P0113 00, P0114 00
|
P0114 00
|
Low Reference
|
-
|
P0113 00, P0114 00
|
P0113 00, P0114 00
|
P0114 00
|
|
| |
Typical Scan Tool Data
IAT Sensor
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
Operating Conditions: Engine operating
in closed loop
Parameter Normal Range: Varies with
ambient temperature
|
IAT Sensor Signal
|
150°C (302°F)
|
-40°C (-40°F)*
|
-40°C (-40°F)*
|
Low Reference
|
-
|
-40°C (-40°F)*
|
-40°C (-40°F)*
|
* Internal ECM or sensor damage may occur if the circuit is
shorted to B+.
|
|
| |
Circuit/System Description
The intake air temperature (IAT) sensor is an integral part of
the mass air flow (MAF) sensor. The intake air temperature (IAT)
sensor 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 V
to the IAT signal circuit and a ground for the IAT low reference
circuit.
The following table illustrates the difference between
temperature, resistance, and voltage:
IAT
|
IAT Resistance
|
IAT Signal Voltage
|
Cold
|
High
|
High
|
Warm
|
Low
|
Low
|
|
| |
Conditions for Running the DTC
P0112 00
| • |
DTCs P0117 00, or P0118 00,
are not set. |
| • |
The engine run time is greater
than 10 s. |
| • |
The engine coolant temperature
(ECT) sensor is less than 150°C (302°F). |
| • |
The vehicle speed is greater
than 0 km/h (0 MPH). |
| • |
The DTC runs continuously once
the above conditions are met. |
P0113 00
| • |
DTCs P0107 00, P0108 00, P0117
00, or P0118 00, are not set. |
| • |
The engine run time is greater
than 10 s. |
| • |
The airflow into the engine is
less than 512 g/s. |
| • |
The engine coolant temperature
(ECT) sensor is greater than -40°C (-40°F). |
| • |
The vehicle speed is less than
512 km/h (318 MPH). |
| • |
The DTC runs continuously once
the above conditions are met. |
P0114 00
| • |
DTC P0112 00, or P0113 00 is
not set. |
| • |
The ignition is ON, or the
engine is running. |
| • |
The battery voltage is greater
than 9 V. |
Conditions for Setting the DTC
P0112 00
The ECM detects that the IAT sensor is greater than 149°C
(300°F) for greater than 10 s.
P0113 00
The ECM detects that the IAT sensor parameter is colder than
-40°C (-40°F) for greater than 4 s.
P0114 00
The ECM detects that the IAT sensor signal has abruptly changed a
minimum of 10°C (18°F) warmer or colder for greater than 2
s.
Action Taken When the DTC Sets
DTCs P0112 00, P0113 00 and P0114 00 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0112 00, P0113 00 and P0114 00 are Type B DTCs.
Reference Information
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
Circuit/System Verification
| 1. |
Engine idling, observe the DTC
information with a scan tool. DTCs P0112 00, P0113 00 or P0114 00
should not set. |
| 2. |
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. |
Circuit/System Testing
| 1. |
Ignition OFF, disconnect the
harness connector at the B75B Mass Air Flow/Intake Air Temperature
Sensor. |
| 2. |
Ignition OFF for 90 s, test
for less than 5 Ω between the low reference circuit terminal
1 and earth. |
| ⇒ |
If greater than the specified range, test the low
reference circuit for an open/high resistance. If the circuit tests
normal, replace the K20 Engine Control Module. |
| 3. |
Ignition ON, verify the scan
tool IAT Sensor is colder than -40°C (-40°F). |
| ⇒ |
If warmer than the specified range, test the
signal circuit terminal A for a short to ground. If the circuit
tests normal, replace the K20 Engine Control Module. |
|
Note: If the fuse in
the jumper wire opens, the signal circuit is shorted to a voltage
and 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 is greater than 130°C (266°F).
|
| ⇒ |
If less 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 Engine Control Module. |
| 5. |
If all circuits test normal,
test or replace the B75B Mass Air Flow/Intake Air Temperature
Sensor. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
