Best way to check the ground signal on injectors?

KMinAF

Old Man
Sep 15, 2006
291
0
0
American Fork, UT
#2 and #6 injectors are not working. I have chased the problem down to what I believe is a no ground signal from the ECU to the injectors.
I have 12v at #2 and #6 injectors but they don't cycle (all others are working fine.) Using a stethoscope there is no click sound when the engine is running.
I have: replaced the ECU with a known good assy.
verified continuity from the injector connector (white with red tracer) to the ECU
checked the resistor and all readings are within specs as per TSM and All Data
tested each injector and the ohm readings are within specs.
Checked for 12v at the injector connector

This all started when I swapped out the original injectors with another set in an attempt to cure a stumble and high HC reading at idle.

Any advise or suggestions would be appreciated
 
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