Idle Up Control Valve: Testing and Inspection

Fig. 15 Idling Stabilizer Amplifier.:

1. Start engine and operate A/C system. Measure compressor clutch cut-off and cut-in engine RPM. Cut-off RPM should be 700-800 RPM.
2. Turn variable resistor shaft, Fig. 15, counterclockwise if cut-off RPM is too high and clockwise if cut-off RPM is too low.