Throttle Sensor (Method With Circuit Tester)

NOTE: Individual difference of the accelerator pedal may not be corrected sufficiently on the ECM side after the memory was 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.

After warming-up the engine, turn the ignition switch to OFF.
Disconnect the ground terminal from battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
Disconnect the connector from ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE CONTROL MODULE (ECM)>REMOVAL .
Attach the ST between the ECM, engine wiring harness and the bulkhead wiring harness. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .
Special tool:

CHECK BOARD (18460AA190)
Connect the ground terminal to battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
Turn the ignition switch to ON. (Engine OFF)

Check the voltage between ECM connector terminals when accelerator pedal is fully closed and fully open.

Check

When voltage is within standard values - Normal
When voltage is not within standard values - It is possible that there is a connector connection failure, harness open circuit, short circuit, or malfunction of the throttle body. Perform inspection or replacement.
If throttle sensor voltage does not change - Go to step 8.

Courtesy of SUBARU OF AMERICA, INC.

Throttle sensor	Accelerator pedal	Terminal No.	Standard
Main	Not depressed (full closed)	31 (+) - 23 (-)	Approx. 0.7 V
Main	Depressed (full opened)	31 (+) - 23 (-)	Approx. 3.9 V
Sub	Not depressed (full closed)	15 (+) - 23 (-)	Approx. 4.4 V
Sub	Depressed (full opened)	15 (+) - 23 (-)	Approx. 1.1 V

Start the engine.
Check the voltage between ECM connector terminals when accelerator pedal is fully closed and fully open.
CAUTION: When depressing the accelerator pedal to fully open, perform it in as short a time as possible, but within the range where the inspection result is not adversely affected.
NOTE:
Perform the inspection in the following conditions.
- For AT model or CVT model: Select lever is in "P" range.
- For MT model: Gear shift lever is in the neutral position.
- Parking brake activated
CHECK
- When voltage is within standard values - Normal
- When voltage is not within standard values - It is possible that there is a connector connection failure, harness open circuit, short circuit, or malfunction of the throttle body. Perform inspection or replacement.
After inspection, install the related parts in the reverse order of removal.
NOTE: For installation procedures of ECM connectors, refer to Engine Control Module (ECM). Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE CONTROL MODULE (ECM)>INSTALLATION .