Question on direct injection fuel system.

[Richard L]

Your second post.

>3500 rpm, you see a full ground signal, it appeared that the (-) switch is fully driven to ground. I wonder if you can obtain a scope to see the waveform before it hits 3500rpm.

Therare two options you can try:
1. Switch to PWM(+), green wire of the yellow harness.
2. Rather switching the polarity of the PWM trigger mode, use the yellow wire. It is desiogned for Common rail diesel of FSI injectors. It detect +ve pulse durations.