User Manual

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.

Pico Technology accepts no responsibility for any damage caused whilst testing circuits. Secondary

ignition circuits can produce in excess of 40 kV and extreme care should be taken. If the lead

becomes damaged in any way it should be discarded and replaced.

Pencil coils (coil-per-cylinder)

These coils are very popular on modern vehicles and either push-fit

directly over the spark plug or are retained by a securing bolt. They

can be tested individually, or if a complete set of extension leads is

available then all cylinders can be tested together.

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. Ensure that any leads or the coil are not resting on any components that will get hot

or rotate.

4. 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. Again if for any

reason this is not possible the test procedure should be terminated. Note: some coils

have protective grease on them which prevents the lead making a secure connection.

It is advisable to wipe this off and reapply after use.

5. If multiple cylinders are to be tested at the same time then follow instructions one to

four for the remaining cylinders.

6. Double-check all connections before attempting to start the vehicle’s engine.

7. Connect the HT pick-up from the oscilloscope kit to the extension lead and select one of the

following tests from the automotive drop down menu:

 Automotive | Ignition | Multi COP Unit | Secondary 4 Cylinders,

 Automotive | Ignition | Multi COP Unit | Secondary (Positive Fired),

 Automotive | Ignition | Coil on Plug | Secondary (Negative Fired),

 Automotive | Ignition | Coil on Plug | Using the HT Extension Lead.