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3-48 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]: BL
Output Terminal [B]: Y/W
Ground Terminal [C]: G
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
â—‹
Be sure the battery is fully charged.
•
Turn the ignition switch off.
•
Disconnect the main throttle sensor connector and con-
nect the setting adapter [A] between these connectors.
Special Tool - Throttle Sensor Setting Adapter: 57001
-1538
•
Connect a digital meter to the setting adapter leads.
Main Throttle Sensor Input Voltage
Connections to Adapter:
Digital Meter (+) → W (sensor BL) lead
Digital Meter (–) → BK (sensor G) 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 main throt-
tle sensor resistance (see Main Throttle Sensor Resis-
tance Inspection).
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