Main Throttle Sensor (Service Code 11)
Disconnect the main throttle sensor connector [A] and
connect the harness adapter [B] between the harness
connector and main throttle sensor connector.
Connect a digital meter to the harness adapter leads.
Special Tool - Throttle
Throttle Sensor Output Voltage
Connections to Sensor
Meter (+) → Y/W 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 throttle is fully
opened or completely closed.
Output Voltage at Sensor
1.02 ∼ 4.62 V DC (at idle throttle
opening to full throttle opening)
The throttle sensor is operating correctly if the following
voltages are obtained:
• 1.02 VDC (or slightly higher) with the throttle at the idle
• 4.62 VDC (or slightly lower) with the throttle at the fully
Do not remove or adjust the main throttle sensor.
It has been adjusted and set with precision at the
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.
1.02 × 4.75 ÷ 5.00 = 0.97 V
4.62 × 4.75 ÷ 5.00 = 4.39 V
Thus, the valid range is 0.97 ∼ 4.39 V
After throttle sensor voltage inspection, remove the har-
If the reading is out of the standard range, inspect the
throttle sensor resistance.
If the output voltage is normal, check the wiring for conti-
nuity (see next diagram).
FUEL SYSTEM (DFI) 3-69