gtir303

can anyone help coil pack no.4 is not switching like the others i traced the wiring back to a conector behind the battery and checked for signal the other side of the conector and its dead the wiring seems to dissapear into the passenger wing was just wondering if anyone knew weather there is a relay or module that the wire goes into or does it go straight to the ecu,i have had alook at the wiring diagram but that just confuses me as that showes 3 wires were as on the coil pack there is only 2 can anyone help

cheers