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Toyota Corolla Repair Manual: Circuit description

The intake air temperature (iat) sensor, mounted on the mass

The intake air temperature (iat) sensor, mounted on the mass air flow (maf) sensor, monitors the intake air temperature. The iat sensor has a thermistor that varies its resistance depending on the temperature of the intake air. When the 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 intake air temperature sensor is connected to the ecm.

The 5 v power source voltage in the ecm is applied to the intake air temperature sensor from terminal tha (thar) via resistor r.

That is, the resistor r and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes in accordance with changes in the intake air temperature, the potential at terminal tha (thar) also changes. Based on this signal, the ecm increases the fuel injection volume to improve the drive ability during cold engine operation.

Dtc no.

Proceed to

Dtc detection condition

Trouble area

P0110 Step 1 Open or short in intake air temperature sensor circuit for 0.5 Seconds
  • Open or short in intake air temperature sensor circuit
  • intake air temperature sensor (built in mass air flow sensor)
  • ecm
P0112 Step 4 Short in intake air temperature sensor circuit for 0.5 Seconds
P0113 Step 2 Open in intake air temperature sensor circuit for 0.5 Seconds

Hint

: after confirming dtc p0110, p0112 or p0113, confirm the intake air temperature in the diagnosis / enhanced obd ii / data list / all using the handheld tester or the obd ii scan tool.

Monitor description

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 equal to 40 c (40 F) or more than 140 c (284 F).

Monitor strategy

Typical enabling conditions

Typical enabling conditions

Typical malfunction thresholds

Typical malfunction thresholds

Component operating range

Component operating range

Wiring diagram

Wiring diagram

Inspection procedure

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 ...

Inspection procedure
Hint: if different dtcs related to different systems that have terminal e2 as the ground terminal are output simultaneously, terminal e2 may be open. Read freeze frame data using the hand-h ...

Other materials:

Evap monitor (vacuum pressure monitor)
Notice: a cold soak must be performed prior to conducting the drive pattern to complete the internal pressure readiness monitor. Cold soak preconditions The monitor will not run unless: mil is off. Fuel level is approximately 1/2 to 3/4. Altitude is 7800 feet (2400 m) or less. ...

Driving monitor
■ Switching the display Items displayed can be switched by pressing the DISP switch. ■ Average fuel consumption Displays the average fuel consumption since the function was reset. Press and hold the DISP switch to reset when the average fuel consumption is displayed. Use ...

Adjustment
Hint: in the rh side, work in the same procedure as in the lh side. Since the centering bolt is used as a door side hinge bolt, the door hinge cannot be adjusted with it on. Substitute the bolt with washer for the centering bolt. 1. Inspect rear door panel subassy lh Check th ...

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