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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:

Engine coolant
The coolant level is satisfactory if it is between the F and L lines on the reservoir when the engine is cold. 1 Reservoir cap 2 F line 3 L line If the level is on or below the L line, add coolant up to the F line. ■Coolant selection Only use Toyota Super Long Life Coola ...

Skid control sensor
Replacement Hint: replace the rh side by the same procedure as the lh side. 1. Remove rear wheel 2. Remove rear brake drum subassy 3. Disconnect skid control sensor wire Disconnect the skid control sensor wire connector from the skid control sensor. 4. Remove rear axle hub & ...

USB Port/AUX Port
Connect an iPod, USB memory device or portable audio player to the USB/AUX port as indicated below. Select iPod, USB or AUX on the audio source selection screen and the device can be operated via multimedia system. Connecting using the USB/AUX port ■ iPod Open the cover and connec ...

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