5000S Wagon L5-2226cc 2.22L SOHC (KZ) (1985)
Idle Up Control Valve: Description and Operation
CIS-E
As of 1985 M.Y., both 4 and 5 cylinder engines use an air idle stabilization system to control idle speed.
This system insures that the idle speed remains constant at predetermined levels during all engine operating conditions.
The system maintains the following idle RPM for these conditions.
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Engine cold (less than 50°C) approximately 1,000 RPM
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Engine warm (above 50°C) = approximately 850 RPM
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Engine warm and A/C compressor engaged = approximately 900 - 950 RPM
The idle air stabilization valve, which eliminates the auxiliary air regulator, consists of an electric motor with two windings and a turning angle of
about 90°. The valve is operated by a cycled voltage signal which is generated by the control unit. By regulating the duty cycle, the valve position
can be controlled, resulting in the idle speed being maintained at a predetermined level.
The cycled voltage signal is the same as the signal used to operate a frequency valve in earlier CIS injection systems. A test plug is located in the
engine compartment to test and adjust the system.