Idle Mixture - Subaru Legacy 2003 Service Manual

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PERIODIC MAINTENANCE SERVICES

15.Idle Mixture

A: INSPECTION AND ADJUSTMENT

1. IDLE MIXTURE

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

4) If out of specification, adjust the idle mixture us-

ing 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

(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 ad-

justing screw (A).

Specified data:

0.28 — 4.22 V

If driving the vehicle on out of specified data, the

"trouble code 49" is indicated in many case.

IDLE MIXTURE

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