Subaru LEGACY 2006 Manual page 3469

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK ENGINE GROUND TERMINALS.
2 CHECK GROUND CIRCUIT FOR ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance of harness
between ECM and engine ground.
Connector & terminal
(B134) No. 5 — Engine ground :
(B136) No. 15 — Engine ground :
(B137) No. 1 — Engine ground :
(B137) No. 2 — Engine ground :
(B137) No. 3 — Engine ground :
(B137) No. 7 — Engine ground :
3 CHECK ACCELERATOR PEDAL POSITION
SENSOR.
1) Disconnect the connectors from accelerator
pedal position sensor.
2) Measure the resistance between accelera-
tor pedal position sensor connector recepta-
cle's terminals.
Connector & terminal
No. 1 — No. 2:
4 CHECK ACCELERATOR PEDAL POSITION
SENSOR.
Measure the resistance between accelerator
pedal position sensor connector receptacle's
terminals.
Connector & terminal
No. 2 — No. 3:
5 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ACCELERATOR PEDAL POSI-
TION SENSOR.
1) Disconnect the connector from TCM.
2) Measure the resistance of the harness
between TCM connector and chassis ground.
Connector & terminal
(B54) No. 19 — Chassis ground:
6 CHECK HARNESS CONNECTOR BETWEEN
ECM AND ACCELERATOR PEDAL POSI-
TION SENSOR.
1) Remove the connectors from ECM.
2) Measure the resistance of harness
between ECM connector and accelerator pedal
position sensor connector.
Connector & terminal
(B315) No. 2 — (B135) No. 30:
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the engine ground terminals
tightened securely?
Is the resistance less than 5
Ω?
Is the resistance between 0.75
— 3.15 kΩ?
Is the resistance between 0.15
— 1.05 kΩ?
Is the resistance more than 1
MΩ?
Is the resistance less than 1
Ω?
4AT(diag)-83
Yes No
Go to step 2. Tighten the engine
ground terminals.
Go to step 3. Repair the open
circuit of harness
between ECM
connector and
engine grounding
terminal.
Go to step 4.
Replace the accel-
erator pedal posi-
tion sensor.
Go to step 5.
Replace the accel-
erator pedal posi-
tion sensor.
Go to step 6. Repair the short
circuit of harness
between TCM and
accelerator pedal
position sensor
connector.
Go to step 7. Repair the open
circuit of harness
between ECM and
accelerator pedal
position sensor.