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3-80 FUEL SYSTEM (DFI)
Subthrottle Sensor (Service Code 32)
The subthrottle sensor is a rotating variable 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]
Subthrottle Sensor Removal/Adjustment
CAUTION
Do not remove or adjust the subthrottle 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.
Subthrottle 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 connector [B], using the
needle adapter set.
Special Tool - Needle Adapter Set: 57001-1457
Subthrottle 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, power supply and wiring
shorted. If the ground and power supply are good, re-
place the ECU (see ECU section).
If the input voltage is within the standard range, check the
input voltage at the subthrottle sensor connector.
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