3-72 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 ECU
Power Supply Inspection). If the ground and power sup-
ply are good, replace the ECU (see ECU Removal/Instal-
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 subthrottle sensor connector.
Connect a digital meter to the harness adapter leads.
Special Tool - Throttle Sensor Setting Adapter:
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.
Output Voltage at Sensor
Standard: DC 1.08 ∼ 4.60 V (at subthrottle valve full
opening to closing)
Do not remove or adjust the subthrottle sensor. It
has been adjusted and set with precision at the fac-
Never drop the throttle body assy, especially on a
hard surface. A shock to the sensor can damage it.
After subthrottle sensor voltage inspection, remove the
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 wiring diagram).