User Manual

DO124-3 © Copyright 2007-2012 Pico Technology. All rights reserved. Page 4 of 4
Wasted-spark coil-pack over one spark plug
This system has a wasted-spark coil pack mounted directly over one
cylinder, whilst a plug lead connects the other end of the double-ended
coil to another spark plug. In the case of the Alfa Romeo twin-spark
system, the second spark plug is within the cylinder head for the same
cylinder. Other systems may use a pair of these coils on a four cylinder
engine and it may be possible see two of the HT plug leads. As systems
vary the user will have to decide on the most appropriate connection
method.
1. With the ignition turned off disconnect the coil from the spark plug.
This will inevitably require the multi-plug to disconnected and reconnected. To aid this operation it
may be worth spraying the plug with some release oil to prevent any damage to the release tabs.
2. Once the coil is disconnected from the spark plug and has its multi-plug refitted, place the extension
lead between the spark plug and the coil. Ensure there is a positive ‘click’ into place at both ends. If
for any reason there is not a secure fit then the test lead should not be used.
3. If the existing plug lead is not long enough to allow the coil to be disconnected and laid on top of
the cylinder head then a second extension lead will be required.
4. Ensure that any leads or the coil are not resting on any components that will get hot or rotate.
5. If the coil was secured to the engine by a retaining bolt then fit the ‘safety earth’ lead to the coil
using the bolt supplied and back to the cylinder head. If for any reason this is not possible, the test
procedure should be terminated.
6. If multiple cylinders are to be tested at the same time then follow instructions one to five for the
remaining cylinders.
7. Double-check all connections before attempting to start the vehicle’s engine.
8. Connect the HT pick-up from the oscilloscope kit to the extension lead and select either of the
below drop-down menu choices within the software. This will depend on which of the two leads of
the coil is tested as one will fire negative and one positive:
 Automotive | Ignition | DIS / Wasted Spark | Secondary DIS / CPC (negative fired),
 Automotive | Ignition | DIS / Wasted Spark | Secondary DIS (positive fired).
ORDER CODE PART DESCRIPTION
GBP USD* EUR*
PP399 Spark Plug Extension Test Lead 24.99 41.99 30.99
PP400 Spark Plug Extension Test Lead Set 95 156.99 114.99
*Prices are correct at the time of publication. Please contact Pico Technology for the latest prices
before ordering. Errors and omissions excepted.
Pico Technology, James House, Colmworth Business Park, Eaton Socon,
ST. NEOTS, Cambridgeshire, PE19 8YP, United Kingdom
Tel. [phone]. Fax [phone]
[e-mail]. [e-mail]. www.picoauto.com