Scope and Multimeter Operations
Ignition Scope
138
Secondary Ignition Adapter Leads
To display secondary ignition waveforms, optional secondary ignition coil
adapter(s) and a coil adapter lead assembly are required.
NOTE
Visit
https://diagnostics.snapon.com
for more information on ignition test
leads and adapters that are applicable with your diagnostic tool, and/or
contact
your sales representative.
Secondary Ignition Adapter Lead
The optional secondary ignition adapter lead is required for Ignition Scope testing
and can be used with the secondary ignition clip-on wire adapter, coil-in-cap (CIC),
or coil-on-plug (COP) secondary ignition adapters to display secondary ignition
signals.
Figure 9-69
Secondary Ignition Coil Adapter Lead
Connecting the Secondary Ignition Adapter Lead
1.
Connect the black right-angle stackable ground lead into the diagnostic tool
ground jack.
2.
Connect the yellow lead into the diagnostic tool channel 1 jack.
3.
Connect the adapter lead ground clamp to vehicle ground. If a jumper wire is
used to extend the length of the adapter lead ground clamp lead, keep it as short
as possible.
4.
Connect the adapter lead RCA plug into the secondary ignition Clip-on or
COP/CIC Ignition Adapter as needed.
5.
Clamp the secondary clip-on adapter (
) over a spark plug or coil
lead, or attach the applicable COP/CIC coil adapter to the vehicle ignition coil.
6.
Isolate the leads from other components to avoid any unwanted noise that
may be induced into the signal.
Secondary Ignition Clip-on Adapter
The optional clip-on adapter clips over a secondary ignition wire to pick up a signal.
The Clip-on adapters RCA connector is connected to the secondary ignition
adapter lead.
Figure 9-70
Secondary Ignition Clip-on Wire Adapter
Inductive RPM Pickup Adapter)
Figure 9-71
Inductive RPM Pickup adapter
The optional Inductive RPM Pickup adapter (
) connects to the DB9F
connector on the diagnostic tool, and is used as an external trigger for the ignition
scope, and is also used for RPM calculations (which may be displayed onscreen).
The signal from this adapter it is not displayed on a channel. The primary purpose
of this adapter is to synchronize the scope to #1 cylinder (if connected to #1) in
order for the scope to display the cylinders in the correct position on the screen.