EFI SYSTEM — Troubleshooting with Volt/Ohmmeter (7M-GTE) FI-67 No. | Terminals | Trouble | Condition | STD Voltage 12 | A/C — E1 | No voltage | Ignition switch ON | Air conditioning ON | 10 ~ 14 V ECU To A/C Amplifier ————————————————— A/C E1 ⏚ FI0255 ① There is no voltage between ECU terminals A/C and E1. (Air conditioning ON) ECU Voltmeter ⊖ ⊕ E1 A/C FI0576 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. ECU Voltmeter ⊖ ⊕ A/C FI0219 Check that there is voltage between amplifier terminal and body ground. | BAD | Repair or replace. OK Check wiring between amplifier and ECU terminal A/C. | BAD | Repair or replace. ECU Ohmmeter ⊖ ⊕ E1 FI0255