Overview ENGINE CONTROLS - INPUT SENSORS - Autoshop 101
Overview ENGINE CONTROLS - INPUT SENSORS - Autoshop 101
Overview ENGINE CONTROLS - INPUT SENSORS - Autoshop 101
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First Design Vane Air How Meter<br />
The first design air flow meter is found on all<br />
Conventional EFI engines and many later<br />
model TCCS equipped engines. This sensor<br />
has an electrical connector with seven<br />
terminals, four of which are used for air flow<br />
measurement.<br />
Air Flow Sensor Terminal Identification<br />
(First Design Sensor)<br />
<strong>ENGINE</strong> <strong>CONTROLS</strong> - <strong>INPUT</strong> <strong>SENSORS</strong><br />
The air flow meter and ECU are wired as<br />
shown in the diagram. Signal characteristics<br />
are depicted by the accompanying graph. The<br />
use of battery voltage, VB, as a sensor input<br />
necessitates the use of the Vc terminal as a<br />
constant reference signal for the ECU. This is<br />
because battery voltage may change with<br />
variances in electrical load and ambient<br />
temperatures. Without the use of a constant<br />
reference voltage, these changes would<br />
cause a change in the Vs signal value<br />
recognized by the ECU.<br />
Page 6 © Toyota Motor Sales, U.S.A., Inc. All Rights Reserved.
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