FI/EFI System, page 37

EFI SYSTEM — Troubleshooting for EFI Electronic Circuit with Volt/Ohmmeter FI-37

No. | Terminal | Trouble | Condition | STD Voltage
3 | Vc — E₂ | No voltage | Ignition S/W ON | Measuring plate fully closed | 4 — 6 V
  | Vs — E₂ |           |                | Measuring plate fully open  | 4 — 5 V
  | Vs — E₂ |           |                |                             | 0.02 — 0.08 V
  | Vs — E₂ | Idling    |                |                             | 2 — 4 V
  | Vs — E₂ | 3,000 rpm |                |                             | 0.3 — 1.0 V
  | THA — E₂ | IG S/W ON | Intake air temperature 20°C (68°F) | 1 — 2 V

Air Flow Meter
F/P Connector

ECU
+B
E₂
Vs
Vc
THA
E₁

FI0738

Voltmeter
ECU ①
Vc
V + —

• Vc ↔ E₂

① There is no voltage between ECU terminals Vc and E₂.
(IG S/W ON)

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

NO | OK

③ Check wiring between ECU terminal E₂ and body
ground.

BAD
Repair or replace

Refer to No. 1. | BAD → Repair or replace
OK ↓

Check air flow meter. | BAD → Repair or replace
OK ↓

Check wiring between
ECU and air flow meter. | BAD → Repair or replace
OK ↓

Try another ECU.

Voltmeter ②
ECU
+B
V + —

Ohmmeter ③
ECU
Ω + —

FI0790