3-78 FUEL SYSTEM (DFI)
Subthrottle Sensor (Service Code 32)
Measure the output voltage with the engine stopped with
the connector joined.
Turn the ignition switch ON.
Measure the output voltage when the subthrottle valve is
completely closed by turning the lever [A] fully clockwise
Standard: DC 0.48 ∼ 0.52 V at subthrottle valve full
DC 3.8 ∼ 4.0 V at subthrottle valve full open
position (for reference)
Turn the lever counterclockwise, confirm the output volt-
age will be raise.
The standard voltage refers to the value when the volt-
age reading at the Input Voltage Inspection shows 5 V
When the input voltage reading shows other than 5 V,
derive a voltage range as follows.
In the case of a input voltage of 4.75 V.
0.48 × 4.75 ÷ 5.00 = 0.46 V
0.52 × 4.75 ÷ 5.00 = 0.49 V
Thus, the valid range is 0.46
Turn the ignition switch OFF.
If the reading is out of the standard, check the subthrot-
tle sensor resistance (see Subthrottle Sensor Resistance
If the reading is within the standard, remove the ECU and
check the wiring for continuity between main harness con-
Disconnect the ECU and sensor connectors.
ECU Connector [A] ←→
Subthrottle Sensor Connector [B]
BR lead (ECU terminal 24) [C]
BR/BK lead (ECU terminal 28) [D]
If the wiring is good, check the ECU for its ground and
power supply (see ECU Power Supply Inspection).
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation).