With ignition on,
Black/yellow = ignition current = 12 v.
White/blue = coil primary circuit = 12 v.
Yellow/green = ECM
Blue = Tachometer.
If you don't have power supply to white/blue wire, the coil or wire is faulty.
Test the resistance of the coil, primary = 0.6 to 0.8 ohm
secondary resistance = 12,800 to 19,200 ohms
replace coil if out of spec.
Tuesday, June 10th, 2008 AT 9:19 AM