DTC P0112, P0113, or P0114
|
|
DTC P0112, P0113, or P0114
|
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
|
|
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
|
IAT Sensor Signal
|
P0112, P0114
|
P0113, P0114, P0112
|
P0113, P0114
|
P0114
|
|
Low Reference
|
-
|
P0113, P0114
|
P0113, P0114
|
P0114
|
IAT Sensor
|
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
|
Operating conditions:
Engine Running
Parameter's 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 a variable resistor. It is integrated into the mass air flow (MAF) sensor. The IAT sensor has a signal circuit and a low reference circuit. The IAT sensor measures the temperature of the air entering the engine. The engine control module (ECM) supplies 5 V to the IAT signal circuit, and a ground for the IAT low reference circuit.
|
Conditions for Running the DTC
|
P0112
|
•
|
The engine run time is greater than 1 s.
|
|
•
|
The DTC runs continuously once the above conditions are met.
|
P0113
|
•
|
The engine run time is greater than 1 s.
|
|
•
|
The DTC runs continuously once the above conditions are met.
|
P0114
|
•
|
The ignition is ON or the engine is running.
|
|
•
|
This DTC runs continuously within the enabling conditions.
|
|
Conditions for Setting the DTC
|
P0112
The ECM detects that the IAT sensor signal is warmer than 149°C (300°F) for greater than 7 s.
P0113
The ECM detects that the IAT sensor signal is colder than -60°C (-76°F) for greater than 7 s.
P0114
The ECM detects that the IAT sensor signal is intermittent or has abruptly changed for greater than 4 s.
|
Action Taken When the DTC Sets
|
|
•
|
DTCs P0112, P0113, and P0114 are Type B DTCs.
|
|
•
|
The ECM commands the cooling fans ON.
|
|
Conditions for Clearing the DTC
|
DTCs P0112, P0113, and P0114 are Type B DTCs.
|
•
|
Depending on the ambient temperature, an IAT sensor signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit can cause a DTC P0113 and/or P0114 to set. This condition causes a rapid fluctuation in the IAT Sensor parameter.
|
|
•
|
An IAT sensor signal circuit that is shorted to the MAF sensor ignition circuit can cause a DTC P0113 and/or P0114 to set.
|
|
•
|
A MAF sensor ground circuit that is open will cause a DTC P0113 and/or a DTC P0114 to set.
|
Schematic Reference
Engine Controls Schematics (3.0L (LF1))
Engine Controls Schematics (2.8L (LAU))
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.
|
With the engine running, note the scan tool's parameter for the IAT sensor. The values should be between -40 and +149 °C (-40 and +300 °F) depending on the current ambient temperature and the vehicle's operating conditions.
|
|
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 MAF/IAT sensor.
|
|
2.
|
Remove the fuse that supplies B+ to terminal 52 X1 of the ECM.
|
|
3.
|
Ignition OFF and all vehicle 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 D and ground.
|
|
4.
|
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 ECM.
|
|
5.
|
Install fuse that supplies B+ to terminal 52 X1 of the ECM.
|
|
6.
|
Ignition ON, verify the scan tool IAT Sensor parameter is colder than -39°C (-38°F).
|
|
7.
|
If greater than the specified range, test the signal circuit's pin E for a short to voltage. If the circuit tests normal, replace the K20 ECM.
|
|
8.
|
|
Note
|
|
If the fuse in the jumper wire opens, the signal circuit is shorted to voltage and the sensor may be damaged.
|
Install a 3 A fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool IAT parameter is greater than 149°C (300°F).
|
|
9.
|
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 ECM.
|
|
10.
|
If all circuits test normal, test or replace the B75B MAF/IAT sensor.
|
Measure and record the resistance of the B66 IAT sensor at various ambient temperatures, then compare those measurements to the
Temperature Versus Resistance - Intake Air Temperature Sensor
table.
Perform the
Diagnostic Repair Verification
after completing the repair.
