Subaru IMPREZA GD 2007 Series Manual page 1619

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
23 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL RELAY.
1) Turn the ignition switch to OFF.
2) Measure the resistance between electronic
throttle control relay connector and chassis
ground.
Connector & terminal
(B309) No. 3 — Chassis ground:
(B309) No. 4 — Chassis ground:
24 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL RELAY.
Measure the resistance between the ECM and
electronic throttle control relay connector.
Connector & terminal
(B136) No. 21 — (B309) No. 3:
(B136) No. 1 — (B309) No. 4:
25 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
electronic throttle control.
3) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B134) No. 19 — Chassis ground:
(B134) No. 18 — Chassis ground:
(B134) No. 18 — (B136) No. 6:
(B134) No. 28 — Chassis ground:
26 CHECK SHORT CIRCUIT INSIDE THE ECM.
1) Connect the ECM.
2) Measure the resistance between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 6 — Engine ground:
(E57) No. 4 — Engine ground:
27 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Disconnect the connectors from the ECM.
2) Measure the resistance of harness between
ECM and electronic throttle control connector.
Connector & terminal
(B134) No. 18 — (E57) No. 6:
(B134) No. 28 — (E57) No. 4:
(B134) No. 29 — (E57) No. 3:
Check
Is the resistance 1 MΩ or more? Go to step 24.
Is the resistance less than 1 Ω? Go to step 25.
Is the resistance 1 MΩ or more? Go to step 26.
Is the resistance 1 MΩ or more? Go to step 27.
Is the resistance less than 1 Ω? Go to step 28.
EN(STI)(diag)-288
Yes No
Repair the ground
short circuit of har-
ness between
ECM and elec-
tronic throttle con-
trol relay.
Repair the open
circuit of harness
between ECM and
electronic throttle
control relay.
Repair the ground
short circuit of har-
ness between
ECM and elec-
tronic throttle con-
trol connector.
Repair the ground
short circuit of har-
ness between
ECM and elec-
tronic throttle con-
trol connector.
Replace the ECM if
defective. <Ref. to
FU(H4DOTC)-50,
Engine Control
Module (ECM).>
Repair the open
circuit of harness
between ECM and
electronic throttle
control connector.