Subaru IMPREZA GD 2007 Series Manual page 281

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK HARNESS BETWEEN ECM AND
KNOCK 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
(B134) No. 15 — (B134) No. 29:
2 CHECK KNOCK SENSOR.
1) Disconnect the connector from knock sen-
sor.
2) Measure the resistance between knock
sensor terminals.
Terminals
No. 1 — No. 2:
Check
Is the resistance 600 kΩ or
more?
Is the resistance 600 kΩ or
more?
EN(H4SO)(diag)-172
Yes No
Go to step 2. Repair poor con-
tact of the ECM
connector.
Replace the knock Repair the harness
sensor. <Ref. to and connector.
FU(H4SO)-25,
NOTE:
Knock Sensor.>
In this case, repair
the following item:
• Open circuit of
harness between
ECM and knock
sensor
• Poor contact of
knock sensor con-
nector
• Poor contact of
coupling connector