TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
p.183

BE/Body Electrical Systems — Idle Switch Circuit, page 184

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p.185
Idle Switch Circuit — MK4 Supra Body Electrical Systems, page 184
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Page text (OCR transcript)
BE–184
BODY ELECTRICAL SYSTEM – CRUISE CONTROL SYSTEM

Idle Switch Circuit

CIRCUIT DESCRIPTION
When the idle switch is turned ON, a signal is sent to the ECU. The ECU uses this signal to correct the discrepancy between the throttle valve position and the actuator position sensor value to enable accurate cruise control at the set speed. If the idle switch is malfunctioning, problem symptoms also occur in the engine, so also inspect the engine.

WIRING DIAGRAM

ECM
IDL1
E9
64
R
R
2 (2JZ-GE)
3 (2JZ-GTE)
Throttle Position Sensor
3
IJ1
Cruise Control ECU
12 V
IDL
21
R

N08435