Page text (OCR transcript)
EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GE) FI-41
No. | Terminals | Trouble | Condition | STD Voltage
6 | THW - E2 | No voltage | Ignition switch ON | Coolant temperature 80°C (176°F) | 0.1 - 1.0 V
ECU
+B (+B1)
THW
E2
E1
Water Temp. Sensor
F10437
1
ECU THW
Voltmeter
E2
V
F10437
2
ECU +B (+B1)
Voltmeter
V
F10432
3
Ohmmeter
Ω
F10645
1 There is no voltage between ECU terminals THW and E2.
(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-35)
Check wiring between ECU terminal E1 and body ground.
OK | BAD
| Repair or replace.
3 Check water temp. sensor.
(See page FI-113)
BAD | OK
Replace water | Check wiring between ECU and
temp. sensor. | water temp. sensor.
| OK | BAD
| Try another ECU. | Repair or replace.