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3-54 FUEL SYSTEM (DFI)
Main Throttle Sensor (Service Code 11)
•
Disconnect the main throttle sensor connector and con-
nect the harness adapter [A] between the harness con-
nector and main throttle sensor connector.
Special Tool - Throttle Sensor Setting Adapter: 57001
-1538
•
Connect a digital meter to the harness adapter leads.
Throttle Sensor Output Voltage
Connections to Adapter
Meter (+) → R (sensor Y/W) lead
Meter (–) → BK (sensor 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
Standard: DC 0.65 ∼ 3.90 V (at idle throttle opening to
full throttle opening)
NOTE
○
The throttle sensor is operating correctly if the following
voltages are obtained:
• DC 0.65 V (or slightly higher) with the throttle at the
idle position.
• DC 3.90 V (or slightly lower) with the throttle at the fully
open position.
CAUTION
Do not remove or adjust the main throttle sensor.
It has been adjusted and set with precision at the
factory.
Never drop the sensor, especially on a hard surface.
A shock to the sensor can damage it.
NOTE
○
The standard voltage refers to the value when the volt-
age reading at the Input Voltage Inspection shows 5V
exactly.
○
When the input voltage reading shows other than 5V,
derive a voltage range as follows.
Example:
In the case of a input voltage of 4.75 V.
0.65 × 4.75 ÷ 5.00 = 0.62 V
3.90 × 4.75 ÷ 5.00 = 3.71 V
Thus, the valid range is 0.62
∼
3.71 V
•
After main throttle sensor voltage inspection, remove the
harness adapter.
If the reading is out of the standard range, inspect the
main throttle sensor resistance.
If the output voltage is normal, check the wiring for conti-
nuity (see wiring diagram in this section).
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