EDIT--ADDED A STEP:-->
- Key on, coils connected, confirm BATTERY voltage at red wires to both coils. Use Battery Ground for (-) lead, (+) lead to coils. TELL US THE VOLTAGE!
- Key on, coils connected, measure BATTERY voltage at the Orange and Grey Wires. Battery is (-) lead or meter ground. TELL US THE VOLTAGE!
- Key off, ECU connected, Orange & Grey coil wires disconnected from coils, OHM between chassis ground (batt Neg term) and Orange and then chassis ground and red. Tell us the values. Reading in Ohms!
- Key off, ECU disconnected, OHM from Orange and Grey back to ECUs wire connector. Both colors should read the same. Tell us the values.
Off hand sounds like this fried your ECU. That will help point fingers at the fault condition.
Ohms - tell us the options on your meter (pictures are easy).
- If the Ohms setting is intimidating, this is the basic concept:
Probes in the air in Ohms mode will show infinite resistance. Current can not conduct between the probes in the air, thus resistance value is very large.
Probes touching each other "shorted" should read less than 0.50 Ohms or a dead short. This shows electricity (current) could flow. Touching these same probes to a known good wire at each end should show a value less than 2.0 Ohms.
Thats it. Let us know.