FI-44 EFI SYSTEM — Troubleshooting with Volt/Ohmmeter (7M-GE) No. Terminals Trouble Condition STD Voltage 9 ISC1~ISC4—E1 No voltage Ignition switch ON 9—14 V EFI Main Relay ECU Fuse EFI 15A ISC1 ISC2 ISC3 ISC4 Fusible Link AM2 30A Fusible Link MAIN 2.0L +B +B1 M.REL Battery E1 FI4653 ISC1 ISC2 ISC3 ISC4 ECU Voltmeter V FI4859 ECU +B +B1 Voltmeter V FI0312 S2 S1 B2 B1 Battery FI1643 1 There is no voltage between ECU terminals ISC1 ~ ISC4 and E1. (IG SW ON) 2 Check that there is voltage between ECU terminal +B (+B1) and body ground. (IG SW ON) OK NO Refer to No. 1. (See page FI-36) Check wiring between ECU terminal E1 and body ground. OK BAD 3 Check ISC valve. (See page FI-106) Repair or replace. BAD OK Replace ISC Check wiring between ECU and EFI valve. main relay. OK BAD Try another ECU. Repair or replace.