Test At Servo Solenoid Valve Connector (Engine Running)
- Disconnect harness at solenoid valve and using a D.C. voltmeter check voltage between connector terminals.
- With engine idling, voltage should be less than 1.0 volts D.C. Increase idle speed for several seconds. Reading should still be less than 1.0 volts D.C. Any indication above 1.0 volts D.C. means control unit should be replaced.