Idle Speed - Subaru Legacy 2002 Service Manual

3. Idle Speed

S173082
A: INSPECTION
1) Before checking idle speed, check the follow-
ing:
(1) Ensure that air cleaner element is free from
clogging, ignition timing is correct, spark plugs
are in good condition, and that hoses are con-
nected properly.
(2) Ensure that malfunction indicator light
(CHECK ENGINE light) does not illuminate.
2) Warm-up the engine.
3) Stop the engine, and turn ignition switch to
OFF.
4) When using SUBARU SELECT MONITOR
<Ref. to ME-15, SPECIAL TOOLS, PREPARA-
TION TOOL, General Description.>
(1) Insert the cartridge to SUBARU SELECT
MONITOR.
(2) Connect SUBARU SELECT MONITOR to
the data link connector.
(3) Turn ignition switch to ON, and SUBARU
SELECT MONITOR switch to ON.
(4) Select {2. Each System Check} in Main
Menu.
(5) Select {Engine Control System} in Selection
Menu.
(6) Select {1. Current Data Display & Save} in
Engine Control System Diagnosis.
(7) Select {1.12 Data Display} in Data Display
Menu.
(8) Start the engine, and read engine idle
speed.
IDLE SPEED
S173082A10
B2M3148
5) When using tachometer (Secondary pick-up
type).
(1) Attach the pick-up clip to No. 1 cylinder
spark plug cord.
(2) Start the engine, and read engine idle
speed.
NOTE:
¼ When using the OBD-II general scan tool, care-
fully read its operation manual.
¼ This ignition system provides simultaneous igni-
tion for #1 and #2 plugs. It must be noted that
some tachometers may register twice that of actual
engine speed.
6) Check idle speed when unloaded. (With
headlights, heater fan, rear defroster, radiator fan,
air conditioning, etc. OFF)
Idle speed (No load and gears in neutral (MT),
or N or P (AT) position):
700±100 rpm
7) Check idle speed when loaded. (Turn air con-
ditioning switch to "ON" and operate compressor
for at least one minute before measurement.)
Idle speed [A/C "ON", no load and gears in
neutral (MT) or N or P (AT) position]:
850±100 rpm
CAUTION:
Never rotate idle adjusting screw. If idle speed
is out of specifications, refer to General On-
board Diagnosis Table under "Engine Control
System". <Ref. to EN-2, Basic Diagnostic Pro-
cedure.> or <Ref. to EN(w/oOBD)-2, Basic Diag-
nostic Procedure.>
ME-25
Mechanical
B2M3131