Operation CHARM: Car repair manuals for everyone.
Home >> Lexus >> 1994 >> SC 400 V8-4.0L (1UZ-FE) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Air Temperature Sensor ( Ambient / Intake ) >> Description and Operation
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Air Temperature Sensor ( Ambient / Intake ): Description and Operation

PURPOSE
The Intake Air Temperature Sensor sends a signal to the Engine Control Module (ECM) indicating the temperature of intake air. The ECM uses this signal to control Air/Fuel ratio to maintain optimum performance in all conditions.

OPERATION
The resistance of the thermistor decreases as the air intake temperature increases. The ECM uses this decreasing resistance to calculate the adjustment to the length of injector opening time necessary. The Intake Air Temperature Sensor is integral to the Volume Air Flow Meter and cannot be serviced seperately.
pro multis · About Operation CHARM