Main Throttle Sensor (Service Code 11)
If the output voltage is within the standard range, check
the ECU for a good ground, and power supply (see ECU
Power Supply Inspection). If the ground and power sup-
ply are good, replace 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 main throttle sensor connector and con-
nect the harness adapter [A] between the harness con-
nector and main throttle sensor connector.
Connect a digital meter [B] to the harness adapter leads.
Special Tool - Throttle Sensor Setting Adapter:
Main 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
Standard: DC 1.025 ∼ 1.055 V (at idle throttle opening)
Approximately DC 4.22 ∼ 4.42 V (full throttle
Do not remove or adjust the main throttle sensor.
It has been adjusted and set with precision at the
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).
Main Throttle Sensor Resistance Inspection
Turn the ignition switch OFF.
Disconnect the main throttle sensor connector.
Connect a digital meter [A] to the main throttle sensor
Measure the main throttle sensor resistance.
Main Throttle Sensor Resistance
Connections: BL lead [C] ←→ BR/BK lead [D]
Approximately 5 kΩ
If the reading is out of the range, replace the throttle body
assy (see Throttle Body Assy Removal/Installation).
If the reading is within the range, but the problem still
exists, replace the ECU (see ECU Removal/Installation).
FUEL SYSTEM (DFI) 3-45