Toyota Supra 1990 Manual page 235

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EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GTE)

Ignition switch

Coolant temperature 80° C

Water Temp. Sensor

There is no voltage between ECU terminals THW and E2.

1 (IG SW ON)

Check that there is voltage between ECU terminal +B (+B1) and

body ground. (lG SW ON)

Refer to No.1.

(See page F I-54)

Check wiring between ECU terminal E1 and body ground.

Check water temp. sensor.

Repair or replace.

(See page F 1-113)

Replace water

Check wiring between ECU and

temp. sensor.

water temp. sensor.

Try another ECU.

Repair or replace.

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