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3-50 FUEL SYSTEM (DFI)
Main Throttle Sensor (Service Code 11)
The main throttle sensor is a rotating v ariable resistor that
change output voltage according to throttle operating. The
ECU s enses 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
CAUTION
Do not remove or adjust the main throttle sensor
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 sensor can dam-
age it.
Main Throttle Sensor Connector [A]
Input Voltage Inspection
NOTE
○
Be sure the battery is fully charged.
•
Turn the ignition switch OFF.
•
Remove the ECU (see ECU Removal).
○
Do not disconnect the ECU connectors.
•
Connect a digital meter [A] to the connectors [B], using
the needle adapter set.
Special Tool - Needle Adapter Set: 57001-1457
Main Throttle Sensor Input Voltage
Connections to ECU Connector
Meter (+) → BL lead (terminal 7)
Meter (–) → BR/BK lead (terminal 34)
•
Measure the input voltage with the engine stopped, and
with the connectors joined.
•
Turn the ignition switch ON.
Input Voltage at ECU Connector
Standard: DC 4.75 ∼ 5.25 V
•
Turn the ignition switch OFF.
If the reading of input voltage is less than the standard,
check the ECU for its ground, and power supply (see ECU
Power Supply Inspection) and wiring shorted. If the input
voltage is within the standard range, check the input volt-
age at the main throttle sensor connector.
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