Subaru IMPREZA GD 2007 Series Manual page 1666

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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 of harness between
ECM and accelerator pedal position sensor
connector.
Connector & terminal
(B135) No. 23 — (B315) No. 6:
(B135) No. 29 — (B315) No. 5:
2 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Connect the ECM.
2) Measure the resistance between accelera-
tor pedal position sensor connector and chassis
ground.
Connector & terminal
(B315) No. 5 — Chassis ground:
3 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between accelerator
pedal position sensor connector and chassis
ground.
Connector & terminal
(B315) No. 6 — Chassis ground (–):
4 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM.
3) Measure the resistance between ECM con-
nectors.
Connector & terminal
(B135) No. 21 — (B135) No. 23:
Check
Is the resistance less than 1 Ω? Go to step 2.
Is the resistance less than 5 Ω? Go to step 3.
Is the voltage 4.85 V or more? Repair the short
Is the resistance 1 MΩ or more? Repair the poor
EN(STI)(diag)-335
ENGINE (DIAGNOSTICS)
Yes No
Repair the open
circuit of the har-
ness between the
ECM and accelera-
tor pedal position
sensor connector.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and engine
ground
• Poor contact in
ECM connector
• Poor contact of
coupling connector
Go to step 4.
circuit to power
source in the har-
ness between the
ECM and accelera-
tor pedal position
sensor connector.
Repair the short
contact of accelera- circuit to power
tor pedal position source in the har-
sensor connector. ness between the
Replace the accel- ECM and accelera-
erator pedal if tor pedal position
defective. <Ref. to sensor connector.
SP(H4SO)-3,
Accelerator Pedal.>