Suzuki outboard motors 1988 2003 repair manual., Page 103Get this manual
FUEL SYSTEM 4-41 ECM
While performing these tests, the throttle valve must be in the fully closed positionMake sure the throttle stop screw is not holding the throttle valve open2Install the test cord between the TVS and the harness connectorUsing the rnultirneter, perform the following procedures with the ignition switch in the ON position and the throttle stop screw turned counter-clockwise until it no longer touches the throttle lever3Connect the negative tester lead to the black test cord lead and the positive tester lead to brownyellow test cord leadThis voltage is referred to as V1 and must be between 3.64-4.39 volts The V1 voltage is not adjustable and is supplied to the TVS through the ICU (Ignition Control Unit)If the V1 voltage is not within the above specifications, the ICU must be replacedUnder normal conditions the diagnostic indicator lamp will show TVS failure mode if the V1 voltage is below specificationOr