Subaru LEGACY 2006 Manual page 327

asieps_tobira.book 290 ページ ２００９年１０月２６日 月曜日 午前９時１６分
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
25 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL MO-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 2 — Engine ground:
(E57) No. 1 — Engine ground:
26 CHECK ELECTRONIC THROTTLE CON-
TROL MOTOR HARNESS.
Measure the resistance between electronic
throttle control connector terminals.
Connector & terminal
(E57) No. 2 — (E57) No. 1:
27 CHECK ELECTRONIC THROTTLE CON-
TROL GROUND CIRCUIT.
Measure the resistance between ECM connec-
tor and chassis ground.
Connector & terminal
(B134) No. 5 — Chassis ground:
(B136) No. 15 — Chassis ground:
(B137) No. 1 — Chassis ground:
(B137) No. 2 — Chassis ground:
(B137) No. 3 — Chassis ground:
(B137) No. 7 — Chassis ground:
28 CHECK ELECTRONIC THROTTLE CON-
TROL.
Measure the resistance between electronic
throttle control terminals.
Terminals
No. 1 — No. 2:
29 CHECK ELECTRONIC THROTTLE CON-
TROL.
Move the throttle valve to the fully open and
fully closed positions with fingers.
Check that the valve returns to the specified
position when releasing fingers.
Check
Is the resistance more than 1
MΩ?
Is the resistance more than 1
MΩ?
Is the resistance less than 10
Ω?
Is the resistance 50 Ω or less? Go to step 29.
Does the valve return to the
specified position? Standard
value: 3 mm (0.12 in) from fully
closed position
EN(H4SO)(diag)-290
Yes No
Go to step 26. Repair the short
circuit of harness.
Go to step 27. Repair the short
circuit of harness.
Go to step 28. Repair the open
circuit of harness.
Replace the elec-
tronic throttle con-
trol.
Repair the poor Replace the elec-
contact of ECM tronic throttle con-
connector. trol.
Replace the ECM
if defective. <Ref.
to FU(H4SO)-36,
Engine Control
Module (ECM).>