TSRM/MK3 Supra/Repair Manual
Repair ManualWiring Diagrams
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FI/EFI System33 / 126
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EFI SYSTEM — Troubleshooting with Volt/Ohmmeter (7M GE) — MK3 Supra EFI System, page 33
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EFI SYSTEM — Troubleshooting with Volt/Ohmmeter (7M GE) FI-33 No. | Terminals | Trouble | Condition | STD Voltage 1 | BATT - E1 | No voltage | — | 10 - 14 V | IG SW - E1 | No voltage | Ignition switch ON | 10 - 14 V | M REL - E1 | No voltage | Ignition switch ON | 10 - 14 V | +B (+B1) - E1 | No voltage | — | 10 - 14 V [DIAGRAM showing circuit with Battery, Fusible Links (AM2 30A, MAIN 2.0L), Fuse (EFI 15A), Ignition Switch (AM2, IG2), EFI Main Relay, and ECU with terminals BATT, +B1, +B, M REL, IG SW, E1] • BATT - E1 ① There is no voltage between ECU terminals BATT and E1. ② Check that there is voltage between ECU terminal BATT and body ground. NO | OK ③ Check wiring between ECU terminal E1 and body ground. OK | BAD Try another ECU. | Repair or replace. Check fuse and fusible links. | BAD | Replace. OK Check wiring between ECU terminal and battery. | BAD | Repair or replace. [DIAGRAM 1: Voltmeter connected between ECU BATT terminal and E1] FI0309 [DIAGRAM 2: Voltmeter connected between ECU BATT terminal and body ground] FI0310 [DIAGRAM 3: Ohmmeter connected between ECU E1 terminal and body ground] FI0311