P0113

2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0110: Intake Air Temperature Circuit

DTC P0110 - Intake Air Temperature Circuit

DTC P0112 - Intake Air Temperature Circuit Low Input

DTC P0113 - Intake Air Temperature Circuit High Input

DESCRIPTION






The Intake Air Temperature (IAT) sensor, built into the Mass Air Flow (MAF) meter, monitors the intake air temperature. The IAT sensor has a thermistor that varies its resistance depending on the intake air temperature. When the intake air temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. The variations in resistance are reflected as voltage changes to the ECM terminal (see Fig. 1).
The IAT sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the IAT sensor from terminal THA via resistor R.
The resistor R and the IAT sensor are connected in series. When the resistance value of the IAT sensor changes in accordance with changes in the intake air temperature, the voltage at terminal THA (THAR) also changes. Based on this signal, the ECM increases the fuel injection volume to improve driveability during cold engine operation.





HINT: After confirming DTC "P0110, P0112 or P0113", use the Techstream to confirm the intake air temperature in the "Powertrain / Engine and ECT / Data List / All Data / Intake Air".





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 fault in the IAT sensor and sets a DTC.
Example:
When the sensor voltage output is -40°C (-40°F) or more than 140°C (284°F).

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS

P0110:





P0112:





P0113:





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
- 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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
(d) Read the values.
Standard:
Same value as actual Intake Air Temperature (IAT).
Result:





HINT:
- If there is an open circuit, the tester indicates -40°C (-40°F).
- If there is a short circuit, the tester indicates 140°C (284°F) or more.

C -- CHECK FOR INTERMITTENT PROBLEMS
B -- READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS)
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS)





(a) Disconnect the M1 Mass Air Flow (MAF) meter connector.
(b) Connect terminals THA and E2 of the MAF meter wire harness side connector.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch ON and turn the tester ON.
(e) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
(f) Read the value.
Standard:
140°C (284°F) or more
(g) Reconnect the MAF meter connector.
OK -- CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER
NG -- Continue to next step.
3. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN ECM)





(a) Disconnect the M1 MAF meter connector.
(b) Connect terminals THA and E2 of the E5 ECM connector.
HINT: Before checking, do a visual and contact pressure check for the ECM connector.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch ON and turn the tester ON.
(e) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
(f) Read the value.
Standard:
140°C (284°F) or more
(g) Reconnect the MAF meter connector.
NG -- CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR
4. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS)





(a) Disconnect the M1 MAF meter connector.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch ON and turn the tester ON.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
(e) Read the value.
Standard:
-40°C (-40°F)
(f) Reconnect the MAF meter connector.
OK -- REPLACE MASS AIR FLOW METER
NG -- Continue to next step.
5. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN ECM)





(a) Disconnect the M1 MAF meter connector.
(b) Disconnect the E5 ECM connector.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch ON and turn the tester ON.
(e) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
(f) Read the value.
Standard:
-40°C (-40°F)
(g) Reconnect the ECM connector.
(h) Reconnect the MAF meter connector.
NG -- REPLACE ECM
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR