Why overlook a ECM sync fault? The ignition relay is controlled by the ignition switch, however the ECM needs to be mobilized to allow spark. The ECM will cut an injector if it detects a certain level of misfire when running, but it does not inhibit spark.
How are you measuring current through the coils, and how are you getting 15V on a non running engine, turn your charger down, that's borderline dangerous.
Your understanding of the sensor is ok, you shouldn't be seeing voltage there, sure you're on the right pins? AC voltage is also a sign of ripple, so again, check your battery charger.
It's far from an actual test, but does it sound normal cranking? When these engines lose compression(usually jumped timing) it will sound very different than normal, fast.
How are you measuring current through the coils, and how are you getting 15V on a non running engine, turn your charger down, that's borderline dangerous.
Your understanding of the sensor is ok, you shouldn't be seeing voltage there, sure you're on the right pins? AC voltage is also a sign of ripple, so again, check your battery charger.
It's far from an actual test, but does it sound normal cranking? When these engines lose compression(usually jumped timing) it will sound very different than normal, fast.
