Idle Speed - Subaru Impreza 2002 Service Manual

3. Idle Speed

A: INSPECTION
1) Before checking idle speed, check the following:
(1) Ensure the air cleaner element is free from
clogging, ignition timing is correct, spark plugs
are in good condition, and the hoses are con-
nected properly.
(2) Ensure the malfunction indicator light
(CHECK ENGINE light) does not illuminate.
2) Warm-up the engine.
3) Stop the engine, and then turn the igintion switch
to OFF.
4) When using the SUBARU SELECT MONITOR
<Ref. to ME-15, SPECIAL TOOLS, PREPARA-
TION TOOL, General Description.>
(1) Insert the cartridge to SUBARU SELECT
MONITOR.
(2) Connect the SUBARU SELECT MONITOR
to data link connector.
(3) Turn the igintion switch to ON, and SUBA-
RU SELECT MONITOR switch to ON.
(4) Select the {2. Each System Check} in Main
Menu.
(5) Select the {Engine Control System} in Se-
lection Menu.
(6) Select the {1. Current Data Display & Save}
in Engine Control System Diagnosis.
(7) Select the {1.12 Data Display} in Data Dis-
play Menu.
(8) Start the engine, and then read the engine
idle speed.
IDLE SPEED
5) When using the tachometer (Secondary pick-up
type).
(1) Attach the pick-up clip to No. 1 cylinder
spark plug cord.
(2) Start the engine, and then read the engine
idle speed.
NOTE:
• When using the OBD-II general scan tool, care-
fully read its operation manual.
• 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 en-
gine speed.
6) Check the 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
B2M3148
7) Check the idle speed when loaded. (Turn the air
conditioning switch to "ON" and operate the com-
pressor for at least 1 minute before measurement.)
Idle speed [A/C "ON", no load and gears in neu-
tral (MT) or N or P (AT) position]:
850 ± ± ± ± 100 rpm
CAUTION:
Never rotate the idle adjusting screw. If the idle
speed is out of specifications, refer to General
On-board Diagnosis Table under "Engine Con-
trol System". <Ref. to EN-2, Basic Diagnostic
Procedure.> or <Ref. to EN(w/oOBD)-2, Basic
Diagnostic Procedure.>
ME-25
MECHANICAL
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