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That is superb cheap price, thank you dip for the link

dip may i know what the vertical scale is for the sine wave used in the picture? The trigger points appear to be +1/3 division and -1.5 divisions. I'm assuming that 0V in in the center.

click to enlarge

Majdi,
do you have a photos that you use this kind of doide? the installation to the board

Sorry gee, i dont have the ecu anymore. you can refer the circuit in first page. Dont use 1N4148, it not work.

Just for confirmation, can i test ckp cyp tdc signal direct to ecu in real time while engine is running with oscilloscope?

Is there possibility damaging the ecu?

Im using Dual channel dso oscilloscope with max input 35v laptop base.

Hey Majdi if you do test using an oscilloscope please post a DIY as I have an oscilloscope and would like to learn to use it to trace thiese types of signals.

Sure can 7rrivera7, i still finding an ecu with error ckp cyp tdc to compare with good ecu. Once i get it test, i post it here.

Thanks!

Hi All,

I just bought an oscilloscope and am trying use it to diagnose a code 4. After removing the H1H1 (or NY1DG in my case) connected the lead from the oscilloscope's frequency generator to the CYK and CYP inputs, and connected the channel A lead to the output for each circuit.

Unfortunately, for both the CYK and CYP circuit I'm only seeing a sinusoidal wave as the output! I was only getting a Code 4 from this ECU so I think I must be doing something wrong with the test.

See pictures below for both circuit tests, the settings on the oscilloscope, and the output of a test where I just clip channel A of the scope to the signal generator-they're al the same!

Here is the circuit diagram that I'm using: http://forum.pgmfi.org/download/file.php?id=8510

Am I doing something wrong, or are both circuits defective?