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 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:

Inspection procedure
Hint: this dtc chart is on the premise that the engine is cranked normally. If the engine is not cranked, proceed to the problem symptoms table on page 0542. Read freeze frame data using the hand-held tester or the obd ii scan tool. Freeze frame data records the engine conditions wh ...

Safety information for children
Observe the following precautions when children are in the vehicle. Use a child restraint system appropriate for the child, until the child becomes large enough to properly wear the vehicles seat belt. ● It is recommended that children sit in the rear seats to avoid accidental contact w ...

Cd cannot be taken out
Wiring diagram Inspection procedure 1 Check if radio autosearch functions properly Check if the radio autosearch function properly.  Perform the autoresearch of the radio and check that the operation is normal. Standard: malfunction disappear. 2 Press eject and chec ...

2011-2021 Copyright www.tcorolla.net