Coil-on-plug extension lead QUICK START GUIDE DO124-3 © Copyright 2007-2012 Pico Technology. All rights reserved.
Introduction These leads are designed to aid diagnostics on secondary ignition circuits by allowing a HT measurement to be made when there is no, or limited, access to any plug leads. The leads are specifically designed for use with an HT pick-up as part of an oscilloscope diagnostic kit. Please read and follow these instructions. Failing to comply with these user notes could result in damage to expensive electrical components.
Cartridge coils This system can only be tested if you have the same number of extension leads as coils within the cartridge coil-pack. The cartridge coil-pack is fitted directly over all the spark plugs and lifts off in one unit. 1. With the ignition turned off, disconnect the coil-pack from the spark plugs. 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.
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.
