Toyota Tacoma manuals

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 hand–held 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:

Replacement
1. Drain engine oil  remove the oil pan drain plug and drain the engine oil. 2. Removal & installation chain sub–assy 3. Remove chain vibration damper no.1  remove 2 bolts and chain vibration damper no. 1. 4. Remove oil pump assy Remove the 5 bolts.  remov ...

Inspection procedure
1 Check operation(stop lamp swtich assy) Check that the stop light comes on when the brake pedal is depressed, and turns off when the brake pedal is released. 2 Input signal check See input signal check on page 05–745.  check the indicator light when the brake pedal is ...

Using the AUX port
To use the AUX port, connect a portable player, press the “AUDIO” button, then select “AUX” to display the audio control screen. Connecting a portable audio player ■Operating portable audio players connected to the multimedia system The volume can be adjusted using the vehicle's audio ...

© 2011-2024 Copyright www.tcorolla.net