Idle Speed

Idle speed is controlled by ECA and idle speed control air by-pass valve on all engines. If control system is operating properly, engine idle RPM is fixed and cannot be changed by standard adjustments. RPM specifications for many engines are not available. A scan tester must be used on these systems because control strategy and idle speed specification are controlled by ECA. See ADJUSTMENTS article.

Before performing idle speed adjustment procedure, complete a thorough basic inspection and self-test (KOEO, KOER, Continuous Memory self-tests) to confirm operation of sub-systems contributing to idle speed control. See TESTS W/CODES article.