FI-54 EFI SYSTEM — Troubleshooting with Volt/Ohmmeter (7M-GTE) ● +B (+B1) — E1 [Diagram 1 showing ECU and Voltmeter connection] ECU Voltmeter E1 +B1 B FI2911 [Diagram 2 showing ECU and Voltmeter connection] ECU Voltmeter E1 +B1 B FI2757 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) NO OK Check wiring between ECU terminal E1 and body ground. OK BAD Try another ECU. Repair or replace. BAD Check fuse, fusible links and wiring harness. Repair or replace. OK Check EFI main relay. (See page FI-109) BAD Replace. OK Refer to M-REL — E1 trouble section.