DIS primary ignition voltage and current (using the 10:1 attenuator)

The purpose of this test is to monitor the primary ignition voltage and current of a DIS unit.

Connection guidance

Connection for diagnostic work will vary dependent on application.

Technicians should whenever possible gain access to the test circuit without damage to seals and insulation. If this is not possible then make sure appropriate repairs are completed.

General connection advice

PicoScope offers a range of options within the test kits.

Dependent on difficulty of access, choose from:

  1. Breakout leads.
  2. Back-pinning probes.

Testing sensors and actuators (to include relevant circuit/connectors):

  • When testing a sensor, it is desirable to gain access at the control module.
  • When testing an actuator, it is desirable to gain access at the actuator.

 

Note: This helpfile refers to a 10:1 attenuator. If you are using a 20:1 attenuator please adjust the Probe settings for the relevant channel. These settings can be found under the Channel Options button, then: Probe > 20:1 Attenuator.

How to perform the test

  1. Connect the 10:1 attenuator into PicoScope channel A.
  2. Connect PicoScope channel A to the ignition coil negative terminal and to earth.
  3. Connect the low amp current clamp to PicoScope channel B. Select the 20 A scale and zero the clamp before clamping onto the coil power supply circuit.
  4. Start the engine and run at idle.
  5. Minimise the help page and with the example waveform on your screen PicoScope has already selected suitable scales for you to capture a waveform.
  6. Start the scope to see live data.
  7. With your live waveforms on screen stop the scope.
  8. Turn off the engine.
  9. Use the Waveform Buffer and Zoom tools to examine your waveform.

Example waveform

Waveform Library

Go to the drop-down menu bar at the lower left corner of the Waveform Library window and select, DIS / wasted spark ignition primary current, or voltage

Example DIS coil pack

Further guidance

For further information, see the following topics:

  • Primary ignition voltage
  • Primary ignition current

GT393-1

Disclaimer
This help topic is subject to changes without notification. The information within is carefully checked and considered to be correct. This information is an example of our investigations and findings and is not a definitive procedure. Pico Technology accepts no responsibility for inaccuracies. Each vehicle may be different and require unique test settings.

Suitable accessories

  • 20 A / 60 A DC (low amps) current clamp

    £111.00

  • Premium 6-way breakout lead set

    £269.00

  • Back-pinning Probe Set

    £40.00

  • Flexible Back-pinning Probe

    £3.00

  • Large Dolphin/Gator Clips

    £10.00

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Guided test: Primary Voltage (Single) vs Current