Toyota Tundra (2015 year). Manual — part 1123
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000PF30VHX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0112,P0113; Intake Air Temperature Circuit Low
Input; 2015 MY Tundra [08/2014 - ]
DTC
P0112
Intake Air Temperature Circuit Low Input
DTC
P0113
Intake Air Temperature Circuit High Input
DESCRIPTION
The Intake Air Temperature (IAT) sensor, mounted on the Mass Air Flow (MAF) meter, monitors the IAT.
the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes (see
Fig. 1).
changes, according to changes in the IAT, the voltage at terminal THA also varies. Based on this signal, the
ECM increases the fuel injection volume when the engine is cold to improve driveability.
HINT:
When DTC P0112 or P0113 is stored, the ECM enters fail-safe mode. During fail-safe mode, the IAT
is estimated to be 20°C (68°F) by the ECM. Fail-safe mode continues until a pass condition is
detected.
DTC NO.
DTC DETECTION CONDITION
TROUBLE AREA
P0112
Short in IAT sensor circuit for 0.5 seconds
(1 trip detection logic)
Short in IAT sensor circuit
IAT sensor (built into MAF meter)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0112,P0113; I...
DTC NO.
DTC DETECTION CONDITION
TROUBLE AREA
ECM
P0113
Open in IAT sensor circuit for 0.5 seconds
(1 trip detection logic)
Open in IAT sensor circuit
IAT sensor (built into MAF meter)
ECM
HINT:
TEMPERATURE DISPLAYED
MALFUNCTION
-40°C (-40°F)
Open circuit
140°C (284°F) or higher
Short circuit
MONITOR DESCRIPTION
The ECM monitors the sensor voltage and uses this value to calculate the IAT. When the sensor output voltage
deviates from the normal operating range, the ECM interprets this as a malfunction in the IAT sensor and stores a
DTC.
Example:
If the sensor output voltage is more than 4.91 V for 0.5 seconds or more, the ECM determines that there is an
open in the IAT sensor circuit, and stores DTC P0113. Conversely, if the output voltage is less than 0.18 V for 0.5
seconds or more, the ECM determines that there is a short in the sensor circuit, and stores DTC P0112.
If the malfunction is not repaired successfully, a DTC is stored 0.5 seconds after the engine is next started.
MONITOR STRATEGY
Related DTCs
P0112: IAT sensor range check (Low voltage)
P0113: IAT sensor range check (High voltage)
Required Sensors/Components (Main)
IAT sensor
Required Sensors/Components (Related)
-
Duration
0.5 seconds
MIL Operation
Immediate
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs not present
None
Battery voltage
8 V or more
Ignition switch
ON
Starter
OFF
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0112,P0113; I...
TYPICAL MALFUNCTION THRESHOLDS
P0112
IAT sensor voltage [IAT]
Less than 0.18 V [More than 128°C (262.4°F)]
P0113
IAT sensor voltage [IAT]
More than 4.91 V [Less than -55°C (-67°F)]
COMPONENT OPERATING RANGE
IAT sensor voltage [IAT]
0.18 to 4.91 V [-55 to 128°C (-67 to 262.4°F)]
CONFIRMATION DRIVING PATTERN
Connect the Techstream to the DLC3.
1.
Turn the ignition switch to ON and turn the Techstream on.
2.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
3.
Turn the ignition switch off and wait for at least 30 seconds.
4.
Turn the ignition switch to ON and turn the Techstream on.
5.
Wait 0.5 seconds or more.
6.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
7.
Read the pending DTCs.
HINT:
If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
8.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
9.
Input the DTC: P0112 or P0113.
10.
Check the DTC judgment result.
TESTER
DISPLAY
DESCRIPTION
NORMAL
DTC judgment completed
System normal
ABNORMAL
DTC judgment completed
System abnormal
INCOMPLETE
DTC judgment not completed
Perform driving pattern after confirming DTC enabling conditions
N/A
Unable to perform DTC judgment
11.
If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and
check for permanent DTCs
.
12.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0112,P0113; I...
HINT:
If a permanent DTC is output, the system is malfunctioning.
If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
data from the time the malfunction occurred.
PROCEDURE
1.
READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air.
(e) Read the value displayed on the Techstream.
Standard:
Same as actual Intake Air Temperature (IAT).
Result
RESULT
PROCEED TO
-40°C (-40°F)
A
140°C (284°F) or higher
B
Same as actual IAT
C
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0112,P0113; I...
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