1998 Johnson Evinrude "EC" 150, 175 FFI Service Manual, P/N 520211, Page 63Get this manual
General Information Causes of SLOW
S.L.OW(Speed Limiting Operational Warning) is an engine running mode that is designed to warn the operator of serious engine system failureIt reduces engine power to prevent further damage, yet allows the operator to retain control of boat speed to return to harborFollowing are the FFI system circuits or components, that, should they fail, will initiate S.L.OWoperationCode Code Code Code Code Code 18 22 25 34 35 43 Alternator Voltage Above Expected Range Water Overheat Switch Activation ECU Temperature Above Expected Range Oil Injector Open Circuit Oil Pressure Loss, SwitchCircuit Malfunction Water Temp Sensor Above Expected Range
Causes That Light System Check Gauge The System Check gauge has four lights that will warn the operator of failed engine systems or componentsThe following are FFI system failures that could turn on these lights: "NO OIL" Light Is On Code 34Oil Injector Open Circuit Code 35Oil Pressure Loss, SwitchCircuit Malfunction "WATER TEMPERATURE" Light Is On Code 22Water Overheat Switch Activation Code 43Water Temp Sensor Above Expected Range "CHECK ENGINE" Light Is On Code Code Code Code Code Throttle Position Sensor Circuit Malfunction Throttle Position Sensor Below Expected Range Throttle Position Sensor Above Expected Range ROM Verification Failure Crankshaft Position Sensor Out of Adjustment or Damaged Code 17Alternator Voltage Below Expected Range Code 18Alternator Voltage Above Expected Range Code Code Code Code Code Code 23 24 25 26 27 28 ECU Temperature Sensor Circuit Malfunction ECU Temp Sensor Below Expected Range ECU Temp Sensor Above Expected Range Battery Voltage Below Expected Range Battery Voltage Above Expected Range Shift Assist Circuit Malfunction