- Short in intake air temperature sensor circuit
- Intake air temperature sensor (built into mass air flow meter)
- ECM
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VIA8 |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 08/2016] |
| Title: 2GR-FE (ENGINE CONTROL): SFI SYSTEM: P0112,P0113; Intake Air Temperature Circuit Low Input; 2016 MY Sienna [12/2015 - 08/2016] | ||
|
DTC |
P0112 |
Intake Air Temperature Circuit Low Input |
|
DTC |
P0113 |
Intake Air Temperature Circuit High Input |
DESCRIPTION
- The intake air temperature sensor, in the mass air flow meter, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature becomes low, the resistance of the thermistor increases. When the temperature becomes high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes (see Fig. 1).
- The intake air temperature sensor is powered by a 5 V supply from the THA terminal of the ECM, via resistor R which is located inside the ECM.
-
Resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes, the voltage at terminal THA varies accordingly. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve driveability.
HINT:
When any of DTCs P0112 and P0113 are stored, the ECM enters fail-safe mode. During fail-safe mode, the intake air temperature 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 intake air temperature sensor circuit for 0.5 seconds (1 trip detection logic) |
|
|
P0113 |
Open in intake air temperature sensor circuit for 0.5 seconds (1 trip detection logic) |
|
HINT:
When any of these DTCs are output, check the intake air temperature by entering the following menus on the Techstream: Powertrain / Engine / Data List / Intake Air.
|
Temperature Displayed |
Malfunction |
|---|---|
|
-40°C (-40°F) |
Open circuit |
|
Higher than 128°C (262°F) |
Short circuit |
MONITOR DESCRIPTION
The ECM monitors the sensor voltage and uses this value to calculate the intake air temperature. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the intake air temperature sensor and stores a DTC.
Example:
If the sensor output voltage is higher than 4.91 V for 0.5 seconds or more, the ECM determines that there is an open in the intake air temperature 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: Intake air temperature sensor range check (Low voltage) P0113: Intake air temperature sensor range check (High voltage) |
|
Required Sensors/Components (Main) |
Intake air temperature sensor |
|
Required Sensors/Components (Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
0.5 seconds |
|
MIL Operation |
Immediately |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever following DTCs are not present |
None |
|
Battery voltage |
8 V or higher |
|
Ignition switch |
ON |
|
Starter |
OFF |
TYPICAL MALFUNCTION THRESHOLDS
P0112
|
Intake air temperature sensor voltage |
Less than 0.18 V [Higher than 128°C (262°F)] |
P0113
|
Intake air temperature sensor voltage |
Higher than 4.91 V [Less than -55°C (-67°F)] |
COMPONENT OPERATING RANGE
|
Intake air temperature sensor voltage |
0.18 V or higher, and 4.91 V or less [-55°C (-67°F) or more, and 128°C (262°F) or less] |
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page
![2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on.
- Wait 0.5 seconds or more.
- Enter the following menus: Powertrain / Engine / Trouble Codes.
-
Read pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P0112 or P0113.
-
Check the DTC judgment result.
Techstream 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
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
-
If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (See page
).
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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) |
(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 / Data List / Intake Air.
(e) Read the value displayed on the Techstream.
OK:
Same as actual intake air temperature.
Result
|
Result |
Proceed to |
|---|---|
|
Displayed temperature is -40°C (-40°F) |
A |
|
Displayed temperature is higher than 128°C (262°F) |
B |
|
Same as actual intake air temperature |
C |
HINT:
- If there is an open circuit, the Techstream indicates -40°C (-40°F).
- If there is a short circuit, the Techstream indicates higher than 128°C (262°F).
| B |
|
| C |
|
|
|
2. |
READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) |
(a) Confirm good connection at the mass air flow meter.
Text in Illustration
|
*1 |
Mass Air Flow Meter |
*2 |
ECM |
|
*a |
Front view of wire harness connector (to Mass Air Flow Meter) |
- |
- |
(b) Disconnect the mass air flow meter connector.
(c) Connect terminals THA and E2 of the mass air flow meter connector on the wire harness side.
(d) Connect the Techstream to the DLC3.
(e) Turn the ignition switch to ON.
(f) Turn the Techstream on.
(g) Enter the following menus: Powertrain / Engine / Data List / Intake Air.
(h) Read the value displayed on the Techstream.
Standard value:
Higher than 128°C (262°F)
HINT:
Perform "Inspection After Repair" after replacing the mass air flow meter (See page
).
| OK |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) |
(a) Disconnect the B4 mass air flow meter connector.
(b) Disconnect the B1 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B4-1 (THA) - B1-73 (THA) |
Always |
Below 1 Ω |
|
B4-2 (E2) - B1-98 (ETHA) |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) |
|
(a) Disconnect the mass air flow meter connector. Text in Illustration
|
|
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Powertrain / Engine / Data List / Intake Air.
(f) Read the value displayed on the Techstream.
Standard value:
-40°C (-40°F)
HINT:
Perform "Inspection After Repair" after replacing the mass air flow meter (See page
).
| OK |
|
|
|
5. |
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) |
(a) Disconnect the B4 mass air flow meter connector.
(b) Disconnect the B1 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Short):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B4-1 (THA) or B1-73 (THA) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|