3-94 FUEL SYSTEM (DFI)
Subthrottle Sensor (Service Code 32)
If the output voltage is within the standard range, check
the ECU for a good ground, and power supply (see this
chapter). If the ground and power supply are good, re-
place the ECU.
If the output voltage is far out of the standard range (e.g.
when the wiring is open, the reading is 0 V), check the
output voltage again at the sensor connector.
Disconnect the subthrottle sensor connector [A] and con-
nect the harness adapter [B] between the harness con-
nector and sub throttle sensor connector.
Connect a digital meter to the harness adapter leads.
Special Tool - Throttle
Subthrottle Sensor Output Voltage
Connections to Sensor
Meter (+) → BR lead
Meter (–) → BR/BK lead
Measure the sensor output voltage with the engine
stopped, and with the connector joined.
Turn the ignition switch ON.
Measure the output voltage when the subthrottle valve is
fully opened or completely closed by hand.
Output Voltage at Sensor
The throttle sensor is operating correctly if the following
voltages are obtained:
• 1.08 VDC (or slightly higher) with the subthrottle valve
at the closed position.
• 4.60 VDC (or slightly lower) with the subthrottle valve
at the fully open position.
Do not remove or adjust the subthrottle sensor. It
has been adjusted and set with precision at the fac-
Never drop the sensor, especially on a hard surface.
A shock to the sensor can damage it.
The standard voltage marked with an asterisk refers to
the value when the voltage reading at the Input Voltage
Inspection shows 5V exactly.
When the input voltage reading shows other than 5V,
derive a voltage range as follows.
In the case of a input voltage of 4.75 V.
1.08 × 4.75 ÷ 5.00 = 1.03 V
4.60 × 4.75 ÷ 5.00 = 4.37 V
Thus, the valid range is 1.03 ∼ 4.37 V
1.08 ∼ 4.60 V DC (at subthrottle valve
full opening to closing)