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3-44 FUEL SYSTEM (DFI)
Main Throttle Sensor (Service Code 11)
The main throttle sensor is a rotating variable resistor that
change output voltage according to throttle operating. The
ECU senses this voltage change and determines fuel injec-
tion quantity, and ignition timing according to engine rpm,
and throttle opening.
Input Terminal [A]
Output Terminal [B]
Ground Terminal [C]
Main Throttle Sensor Removal/Adjustment
NOTICE
Do not remove or adjust the main throttle sensor [A]
since it has been adjusted and set with precision at
the factory.
Never drop the throttle body assy especially on a
hard surface. Such a shock to the main throttle sen-
sor can damage it.
Main Throttle Sensor Input Voltage Inspection
NOTE
○
Be sure the battery is fully charged.
•
Turn the ignition switch OFF.
•
Disconnect the main throttle sensor connector and con-
nect the harness adapter [A] between these connectors.
Special Tool - Throttle Sensor Setting Adapter: 57001
-1538
•
Connect a digital meter to the harness adapter leads.
Main Throttle Sensor Input Voltage
Connections to Adapter:
Digital Meter (+) W (sensor BL) lead
Digital Meter (–) BK (sensor BR/BK) lead
•
Measure the input voltage with the engine stopped and
with the connector joined.
•
Turn the ignition switch ON.
Input Voltage
Standard: DC 4.75
∼ 5.25 V
•
Turn the ignition switch OFF.
If the reading is within the standard, check the output volt-
age (see Main Throttle Sensor Output Voltage Inspec-
tion).
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