Power Circuits (Discovery)
Turn ignition on. Using a backprobe set, measure voltage between ground and ECM Black 18-pin connector terminal No. 8 (White/Green wire). See WIRING DIAGRAMS . If battery voltage does not exist, check fuse No. 3 (20-amp), located in satellite fuse box No. 1. If fuse is okay, check for an open in suspect circuit between fuse box and ECM. If fuse is not okay, repair short in suspect circuit and replace fuse. See WIRING DIAGRAMS .