• M-REL ↔ E1 ① There is no voltage between ECU terminals M-REL and E1. (IG S/W ON) ② Check that there is voltage between ECU terminal M-REL and body ground. (IG S/W ON) NO Check wiring between ECU terminal E1 and body ground. OK BAD Repair or replace Check NO. 1 main relay and wiring harness. BAD Replace OK Try another ECU.