©eBlue-Dist 2007
Chapter Three
Troubleshooting and Testing
There are three basic requirements for all internal combustion engines to run: proper ignition, unrestricted fuel supply, and adequate compression. When troubleshooting a problem, keep it simple. Define the symptom as closely as possible to one of the three functions, and then isolate the problem. Expensive equipment or complicated test gear is not necessary to detennine whether repairs can be attempted at home. A few simple tests could prevent a large repair bill and lost time while the vehicle sits in a service department. However, do not attempt repairs beyond your abilities. Service departments tend to charge heavily for putting together a disassembled engine that may have been abused. This chapter covers test equipment, troubleshooting preparation and systems or component testing. Tables 1-8 are located at the end of this chapter. NOTE This manztalprovidespr-ocedures and specifications for standard products. Infornzation ?nay not apply if the product has been modzj?edJi.omits original factory condition or has afteirnzarket equipment installed.
The use of aftermarket equipment or modzfication of the engine can affect erzgine performatzce and tuning requirements. For information on aftermarket equipment, consult a dealerslzip ilzat handles such eqztipment or is fat7ziliar with engine modification. Ifnecessa~y,contact the nza7zujactur"er of tlze aj?ernzarket eqtlipmerzt for informatioiz.
TEST EQUIPMENT Multimeter
Modern outboards use advanced electronic engine control systems that help optimize the performance, reliability, and fuel economy. A multimeter is necessary to accurately test these control systems. A multimeter combines the functions of a voltmeter, ohmmeter, and ammeter into one unit. Perform all tests using either an analog or digital multimeter. Refer to this section any time a question arises on using a multimeter. A digital multimeter displays the readings on an LCD screen on the front of the meter. An analog multimeter
