Subthrottle Sensor (Service Code 32)
The subthrottle 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]
Subthrottle Sensor Removal/Adjustment
Do not remove or adjust the subthrottle sensor [A]
since it has been adjusted and set with precision at
Never drop the throttle body assy, especially on a
hard surface. Such a shock to the sensor can dam-
Subthrottle Sensor Input Voltage Inspection
Be sure the battery is fully charged.
The inspection is the same as "Input Voltage In-
spection" of the inlet air pressure sensor and the
atmospheric pressure sensor.
Turn the ignition switch OFF.
Remove the ECU (see ECU Removal). Do not disconnect
the ECU connectors.
Connect a digital voltmeter to the connector, using the
needle adapter set.
Special Tool - Needle Adapter Set: 57001-1457
Subthrottle Sensor Input Voltage
Connections to ECU Connector
(Without Oxygen Sensor Equipped Models [A])
Meter (+) → BL lead (terminal 8)
Meter (–) → BR/BK lead (terminal 22)
(Oxygen Sensor Equipped Models [B])
Meter (+) → BL lead (terminal 10)
Meter (–) → BR/BK lead (terminal 28)
Measure the input voltage with the engine stopped, and
with the connectors joined.
Turn the ignition switch ON.
Input Voltage at ECU Connector
DC 4.75 ∼ 5.25 V
FUEL SYSTEM (DFI) 3-73