Toyota Tazz secondary HT

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Toyota Tazz secondary HT

Postby Christiaan » Sat Sep 09, 2017 10:55 pm

Good day.
I am new to scope diagnostics
I connected my pico to number 1 Cylinder HT lead to see the pattern . This pattern does not look correct .
Can anyone share some light.
Toyota Tazz 2001 carberator
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Christiaan
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Re: Toyota Tazz secondary HT

Postby Technician » Sun Sep 10, 2017 11:01 am

Hi Christiaan

It looks like you have set your time base settings to micro seconds [us], can you do the waveform again but set your time base in milli seconds [ms]. Try setting the scope KV at something like 20 + and the time base at 5 ms or more, redo the scope trace and see if you can achieve a full ignition cycle. A good ignition waveform should fill the scope screen area.

See example;

http://www.gonzostoolbox.com/Secondary_ ... ATTERN.JPG
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Re: Toyota Tazz secondary HT

Postby STC » Sun Sep 10, 2017 10:32 pm

Christiaan

That scope trace is not what one would expect.

What is the issue with the car - Fault codes, symptoms etc. would be a big help.
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Re: Toyota Tazz secondary HT

Postby Christiaan » Mon Sep 11, 2017 11:23 am

Hi .
This is a 1.3 carberator so there are no fault codes.
The only problem is the fuel consumption is high and sometimes it takes about 5 seconds of cranking before it starts.
There is ni misfiring and once it starts it runs smoothly.
Christiaan
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Re: Toyota Tazz secondary HT

Postby Technician » Mon Sep 11, 2017 12:18 pm

Hi Christiaan,

The ignition waveform is not performing at all well, see my previous example of what they normally look like. It may also be advantageous to have a four gas analysis completed if there is no CAT fitted. The results should help to lead you in the correct direction.
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Re: Toyota Tazz secondary HT

Postby Christiaan » Mon Sep 11, 2017 12:38 pm

Hi Technician
There is no CAT Fitted.
I will set the time base on the scope as suggested and do a retest when I am back at the vehicle.
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