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.