Subaru IMPREZA GD 2007 Series Manual page 386

asieps_tobira_IM_US.book 277 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
21 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL RE-
LAY.
1) Disconnect the connectors from the ECM.
2) Turn the ignition switch to ON.
3) Measure the voltage between electronic
throttle control relay connector and chassis
ground.
Connector & terminal
(B309) No. 3 (+) — Chassis ground (–):
22 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL RE-
LAY.
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:
23 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL RE-
LAY.
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:
24 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:
25 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:
26 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 voltage 10 V or more?
Is the resistance 1 MΩ or
more?
Is the resistance less than 1 Ω? Go to step 24.
Is the resistance 1 MΩ or
more?
Is the resistance 1 MΩ or
more?
Is the resistance less than 1 Ω? Go to step 27.
EN(H4SO)(diag)-277
ENGINE (DIAGNOSTICS)
Yes No
Repair the short Go to step 22.
circuit to power in
the harness
between ECM and
electronic throttle
control relay.
Go to step 23. Repair short cir-
cuit of the harness
to ground between
ECM and elec-
tronic throttle con-
trol relay.
Repair the open
circuit of harness
between ECM and
electronic throttle
control relay.
Go to step 25.
Repair short cir-
cuit of the harness
to ground between
ECM and elec-
tronic throttle con-
trol connector.
Go to step 26.
Repair short cir-
cuit of the harness
to ground between
ECM and elec-
tronic throttle con-
trol connector.
Replace the ECM if
defective. <Ref. to
FU(H4SO)-39,
Engine Control
Module (ECM).>
Repair the open
circuit of harness
between ECM and
electronic throttle
control connector.