Main Throttle Sensor (Service Code 11)
If the reading is out of the standard, remove the ECU
and check the wiring for continuity between main harness
Disconnect the ECU and sensor connectors.
ECU Connector [A] ←→
Main Throttle Sensor Connector [B]
BL lead (ECU terminal 5) [C]
BR/BK lead (ECU terminal 33) [D]
If the wiring is good, check the ECU for its ground and
power supply (see ECU Power Supply Inspection).
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation).
Main Throttle Sensor Output Voltage Inspection
Measure the output voltage at the main throttle sensor in
the same way as input voltage inspection, note the follow-
Disconnect the main throttle sensor connector and con-
nect the harness adapter [A] between these connectors.
Special Tool - Throttle Sensor Setting Adapter:
Main Throttle Sensor Output Voltage
Connections to Adapter:
Digital Meter (+) → R (sensor BL/W) lead
Digital Meter (–) → BK (sensor BR/BK) lead
Start the engine and warm it up thoroughly.
Check idle speed to ensure the throttle opening is correct.
1 100 ±50 r/min (rpm)
If the idle speed is out of the specified range, adjust it
(see Idle Speed Inspection in the Periodic Maintenance
FUEL SYSTEM (DFI) 3-45