Quote:
Originally Posted by fj1200
Phil mentioned the test connector was deleted, if there is in fact an O2 sensor and frequency valve then no test connector is needed.
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It depends exactly what you use to measure - the line from the ECU is resistive and documented at 10 Ohms, so it distorts the waveform. You have to go to the ECU (pin 8 on most implementations) which is what the test connector actually does for you.
Orin Eman (on the original US-based quattro list) developed a little PCB that showed the duty cycle digitally - I have one of his PCBs on my MAC12 breakout box.