Subaru IMPREZA GD 2007 Series Manual page 409

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the ECM
and accelerator pedal position sensor.
3) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B135) No. 22 — Chassis ground:
(B135) No. 31 — Chassis ground:
2 CHECK SHORT CIRCUIT INSIDE THE ECM.
1) Connect the ECM.
2) Measure the resistance between accelera-
tor pedal position sensor connector and chassis
ground.
Connector & terminal
(B315) No. 3 — Chassis ground:
Check
Is the resistance 1 MΩ or
more?
Is the resistance 1 MΩ or
more?
EN(H4SO)(diag)-300
Yes No
Go to step 2. Repair short cir-
cuit of the harness
to ground between
the ECM and
accelerator pedal
position sensor
connector.
Replace the accel- Repair short cir-
erator pedal. <Ref. cuit of the harness
to SP(H4SO)-3, to ground between
Accelerator the ECM and
Pedal.> accelerator pedal
position sensor
connector.
Replace the ECM if
defective. <Ref. to
FU(H4SO)-39,
Engine Control
Module (ECM).>