Check Accelerator Pedal Sensor Area (Method With Circuit Tester)

Remove the lower inner trim of passenger's side.
< Ref. to REMOVAL , Lower Inner Trim. >
Turn over the floor mat of passenger's seat.
Remove the protect cover.

Fig 1: Locating Protect Cover Mounting Nuts
Courtesy of SUBARU OF AMERICA, INC.
Remove the nuts and bolts which hold the ECM to the bracket.

Fig 2: Locating ECM Bracket Mounting Nuts And Bolts
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Turn the ignition switch to ON. (engine OFF)
Measure the voltage between ECM connector terminals.
- Main sensor side
  
  Fig 3: Measuring Voltage (Main Sensor Side)
  Courtesy of SUBARU OF AMERICA, INC.
- Sub sensor side
  
  Fig 4: Measuring Voltage (Sub Sensor Side)
  Courtesy of SUBARU OF AMERICA, INC.

ECM CONNECTOR TERMINALS REFERENCE CHART

Accelerator pedal sensor	Accelerator pedal	Terminal No.	Standard
Main	Not depressed (Full closed)	23 (+) and 29 (-)	0.4 - 1.0 V
Main	Depressed (Full opened)	23 (+) and 29 (-)	2.4 - 3.7 V
Sub	Not depressed (Full closed)	31 (+) and 30 (-)	0.3 - 1.1 V
Sub	Depressed (Full opened)	31 (+) and 30 (-)	2.3 - 3.8 V