Special Tools
EL–39200 Digital Multimeter (DMM)
For equivalent regional tools, refer toSpecial Tools.
Caution:Refer toTest Probe Caution.
The following procedure determines the frequency of a signal.
Note:Connecting the Digital Multimeter (DMM) to the circuit before pressing the Hz buttonwill allow the DMM to autorange to an appropriate range.
Apply power to the circuit.Set the DMM to the V (AC) position.Connect the positive lead of the DMM to the circuit to be tested.Connect the negative lead of the DMM to a good ground.Set to Hz on the DMM.The DMM will display the frequency measured.
Measuring Voltage Drop
Measuring VoltageFuel Pressure Relief Engine Control
Warning:Fuel that flows out at high pressure can cause serious injuryto the skin and eyes. ALWAYS depressurize the fuel system beforeremoving components that are under high fuel pressure.Note:If a scan tool is not available, WAIT at LEAST 2-hours after the engine has been run,before removing the hig ...