Intake Air Temp. Sensor Signal - Toyota 2VZ-FE Manual

TR–42
Diag. Code
CIRCUIT DESCRIPTION
The intake air temperature sensor is built in the air flow meter and senses the intake air temperature.
The resistance value of a thermistor built in sensor changes according to the intake air temperature.
The lower the intake air temperature, the larger the resistance value becomes.
If diagnostic code 24 is recorded in memory, the fair safe function operates and fixes the intake air
temperature at a constant 20°C (68°F).
Code No.
Open or short in intake air temp. sensor
circuit for 0.5 sec. or more (THW).
24
DIAGNOSTIC CHART
Check intake air temp. sensor.
Check voltage between terminals THA
and E2 of ECU connector.
Check harness and connector between
ECU and intake air temp. sensor.
Replace ECU.
WIRING DIAGRAM AND ECU CONNECTORS
ENGINE TROUBLESHOOTING
24

Intake Air Temp. Sensor Signal

Diagnosis
– Circuit Inspection
Open or short in intake air temp. circuit.
Water temp. sensor
ECU
Replace air flow meter.
Replace ECU. *
Repair or replace harness or
connector.
* When diag. code 24 is not displayed, proceed
to next circuit inspection shown on matrix
chart (See page TR–21).
Trouble Area