Idle Mixture - Subaru 2001 LEGACY Service Manual

14. Idle Mixture

A: INSPECTION AND ADJUSTMENT
SA07734G26
1. IDLE MIXTURE
SA07734G2601
Before measuring the idle mixture, make sure that
the ignition timing and the engine idle speed are
within specifications.
1) Set the gear position at "Neutral" for MT, or "N"
or "P" for AT.
2) Warm up engine sufficiently until cooling fan
starts to operate.
3) Measure the idle mixture with the CO meter.
Engine idle speed
700±100 rpm
4) If out of specification, adjust the idle mixture
using CO adjusting screw of mass air flow sensor.
5) After adjusting the CO value, check and adjust
increment coefficient of CO resistor by using Select
Monitor.
(1) Select "Current data display & Save" on the
select monitor.
(2) If out of specified data, adjust the increment
coefficient of CO resistor while rotating CO
adjusting screw.
Specified data:
0.28 — 4.22 V
NOTE:
If driving the vehicle on out of specified data, the
"trouble code 49" is indicated in many case.
IDLE MIXTURE
SA07734
CO
1.0±0.5%
GI0114A
PM-23
Periodic Maintenance Services