Throttle Sensor (Method With Circuit Tester)

NOTE: Individual difference of the accelerator pedal may not be corrected sufficiently on the ECM side after DTCs were cleared or the battery was removed and installed on the vehicle.
Therefore, when the reference voltage is not reached after following the procedure, repeat the ignition switch ON (engine OFF) and ignition switch OFF operations 40 times at intervals of three seconds or more, and then measure the voltage again.

Disconnect the ground terminal from battery sensor. Refer to NOTE>NOTE>BATTERY .
Remove the engine control module (ECM). Refer to FUEL INJECTION (FUEL SYSTEMS) (W/O STI)>ENGINE CONTROL MODULE (ECM)>REMOVAL .
Install the ST between the ECM and bulkhead harness and the engine wiring harness. Refer to ENGINE (DIAGNOSTICS) (W/O STI)>GENERAL DESCRIPTION>CAUTION .

ST 18460AA030 CHECK BOARD
Connect the ground terminal to battery sensor. Refer to NOTE>NOTE>BATTERY .
After warming-up the engine, turn the ignition switch to OFF.
Turn the ignition switch to ON. (Engine OFF)

Measure the voltage between ECM connector terminals using ST.

Courtesy of SUBARU OF AMERICA, INC.

Throttle sensor	Accelerator pedal	Terminal No.	Standard
Main	Not depressed (full closed)	17 (+) and 30 (-)	Approx. 0.7 V
Main	Depressed (full opened)	17 (+) and 30 (-)	Approx. 3.9 V
Sub	Not depressed (full closed)	29 (+) and 30 (-)	Approx. 4.4 V
Sub	Depressed (full opened)	29 (+) and 30 (-)	Approx. 1.1 V

After inspection, install the related parts in the reverse order of removal.