FI/EFI System, page 33

EFI SYSTEM — Troubleshooting for EFI Electronic Circuit with Volt/Ohmmeter                FI-33

• +B ↔ E₁

① There is no voltage between ECU terminals +B and E₁.
(IG S/W ON)

② Check that there is voltage between ECU terminal +B and body
ground. (IG S/W ON)

NO          OK
     Check wiring between ECU terminal E₁ and
     body ground.
                    BAD
          Repair or replace

Check fuse and wiring harness.     BAD → Repair or replace

OK
↓
Check NO. 1 main relay.     BAD → Replace


• IG S/W ↔ E₁

① There is no voltage between ECU terminals IG S/W and E₁.
(IG S/W ON)

② Check that there is voltage between ECU terminal IG S/W and
body ground. (IG S/W ON)

NO          OK
     Check wiring between ECU terminal E₁ and
     body ground.
                    BAD
          Repair or replace

↓
Check fusible links and ignition     NO → Repair or replace
switch.