EFI SYSTEM — Troubleshooting with Volt/Ohmmeter (7M-GE) FI-35 • +B (+B1) — E1 1 There is no voltage between ECU terminals +B (+B1) and E1. (IG SW ON) 2 Check that there is voltage between ECU terminal +B (+B1) and body ground. (IG SW ON) OK Check wiring between ECU terminal E1 and body ground. OK BAD Try another ECU. Repair or replace. OK BAD Check fuse, fusible links and wiring Repair or replace. harness. OK BAD Check EFI main relay. Replace. (See page FI-109) OK Refer to M-REL — E1 trouble section.