FI-46 EFI SYSTEM — Troubleshooting with Volt/Ohmmeter (7M-GE) No. | Terminals | Trouble | Condition | STD Voltage 11 | A/C — E1 | No voltage | Air conditioning ON | 10 — 14 V ECU To A/C Amplifier ←——————————————————————————— A/C E1 ⏚ FH925 ① There is no voltage between ECU terminals A/C and E1. (Air conditioning ON) ① ECU A/C Voltmeter ⏚ ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ V E1 FH254 ② Check that there is voltage between ECU terminal A/C and body ground. NO OK ③ Check wiring between ECU terminal E1 and body ground. OK BAD Try another ECU. | Repair or replace. ② ECU A/C Voltmeter ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ V ⏚ FH254 Check that there is voltage between | BAD | Repair or replace. amplifier terminal and body ground. OK Check wiring between amplifier and | BAD | Repair or replace. ECU terminal A/C. ③ E1 ECU Ohmmeter ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Ω ⏚ FI0011