2004-2006 Kawasaki 900 STX Jet Ski Service Manual, Page 197Get this manual
ELECTRICAL SYSTEM 14-31 Ignition System
Air Temperature Sensor Input Voltage Inspection
Disconnect the airtotemperatureVsensor [A] connector.it to the tester [B] the DC range, and Set sensor connector [C] of 10 main harnessconnect the the sideSpecial ToolHand Tester: 57001-1394 Connections Tester Positive Tester Negative BlueWhite BlackWhite
all the spark plug Pullcaps fully onto thecaps from the spark plugs and push the spark plug cap holderTurn the ignition switch on and push the lanyard key under the stop button Pushing the starter button, crank the engine seconds
Do not operate the starter for longer than secondsWait 15 seconds before using it againCheck the tester readingAir Temperature Sensor Input Voltage: around DC V
Check the above process within three minutesIf the tester reading does not show specified voltage, the CDI igniter might be defective