Subaru LEGACY 2006 Manual page 668

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Diagnostic Trouble Code (DTC) Detecting Criteria
DV:DTC P2138 THROTTLE/PEDAL POSITION SENSOR/SWITCH "D"/"E" VOLT-
AGE CORRELATION
1. OUTLINE OF DIAGNOSIS
Judge as NG when the signal level of throttle position sensor 1 is different from the throttle position sensor 2.
2. COMPONENT DESCRIPTION
(1)
(1) Engine control module (ECM)
(2) Accelerator pedal position sensor
1 signal
3. ENABLE CONDITION
Secondary Parameters
Ignition switch
Battery voltage
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(2)
(3)
(3) Accelerator pedal position sensor
2 signal
Enable Conditions
ON
≥ 6 (V)
GD(H4SO)-231
GENERAL DESCRIPTION
(4)
EN-01861
(4) Accelerator pedal position sensor