TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
p.187

BE/Body Electrical Systems, page 188

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p.189
Body Electrical Systems — MK4 Supra Body Electrical Systems, page 188
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Page text (OCR transcript)
BE–188
BODY ELECTRICAL SYSTEM – CRUISE CONTROL SYSTEM

3  Check voltage between terminal ECT of cruise control ECU connector and body ground (On test drive).

P  (1) Connect ECU connector.
    (2)  Test drive after engine warm up.

C  Check voltage between terminal ECT of cruise control ECU connector and body ground when OD switch is on and off.

OK
Gear Position          Voltage
O/D                    Below 1 V
3rd                    10 – 14 V

ECT

N08764

NG                     OK   Proceed to next circuit inspection shown on matrix chart (See page BE–170).

4  Check for open and short in harness and connector between terminal ECT cruise control ECU and electronically controlled transmission solenoid (See page IN–30).

OK                     NG   Repair or replace harness or connector.

Check and repair ECU.

5  Check for open and short in harness and connector between terminal OD1 of ECU and terminal OD1 of ECM (See page IN–30).

OK                     NG   Repair or replace harness or connector.

Check and replace ECU.