Toyota Supra 1990 Manual page 218

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ISC1~ISC4-E1

EFI SYSTEM -

Troubleshooting with Volt/Ohmmeter (7M-GE)

Ignition switch ON

EFI Main Relay

'-O-+-------()

~-k~~~+---~ISC2

~----------------~+B

L------------------C+B1

~---------------------oM-REL

There is no voltage between ECU terminals ISC1

E1. (lG SW ON)

Check that there is voltage between ECU terminal +B (+B 1)

and body ground. (lG SW ON)

Refer to No. 1.

(See page F 1-35)

Check wiring between ECU terminal E1 and body ground.

Check I SC valve.

(See page F 1-1 06)

Repair or replace.

Check wiring between ECU and EFI

Try another ECU.

Repair or replace.

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