Equus 5568 - INNOVA Pro Digital Timing Light (DIS) - Manual (Page 8)

Operation
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b. When the engine is started, the timing light enters the voltage/rpm mode; the
Charging System Battery VOLTS indicator, Volts symbol and Ignition Mode
symbol (either 2-cycle (DIS) or 4-cycle) will display. The LCD display will show
charging system voltage and engine rpm.
CHECKING DWELL ANGLE
Dwell angle check is performed for vehicles equipped with conventional or electronic
ignition systems.
• Make sure timing light is properly connected as described in TIMING LIGHT
CONNECTION.
a. Start and run engine until it reaches normal operating temperature.
b. Press Function (F) switch as needed to select dwell mode. The DWELL Indicator,
Cylinder Symbol, and Dwell Angle Symbol will display when dwell mode is
selected.
■ Press Cylinder/Advance Increment and Decrement switches as needed to
select appropriate number of cylinders for vehicle under test. The LCD
display will show the number of cylinders selected and the dwell angle.
c. Note dwell angle and compare to manufacturer's specifications.
d. Refer to the vehicle's service manual for procedures to adjust dwell angle.
e. Turn ignition off and disconnect timing light from engine.
INITIAL TIMING CHECK (USING NO. 1 CYLINDER)
• ALWAYS refer to the manufacturer's test procedures and specifications when
performing timing check. Timing procedures vary from vehicle to vehicle. Refer to
the Vehicle Emission Control Label or service manual for the vehicle under test.
NOTE: Some vehicles equipped with computerized engine control systems may
be designated as "NON-ADJUSTABLE".
• Make sure timing light is properly connected as described in TIMING LIGHT
CONNECTION.
• MAKE SURE the proper operating mode is selected (2- cycle (DIS) or 4-cycle).
• If vehicle is equipped with distributor points, check dwell as described in
CHECKING DWELL ANGLE, and adjust if necessary BEFORE performing
timing check.
a. Start and run engine until it reaches normal operating temperature.
■ The Flash Indicator will blink to indicate the timing light is operating.
■ Press both ignition system selection switches SIMULTANEOUSLY to select
either 2-cycle (DIS) or 4-cycle mode. The Ignition Mode Symbol will display
the selected mode.