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WIRING DIAGRAM

ECM Power Source Circuit

CIRCUIT DESCRIPTION

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When the ignition switch is turned on, battery volt-

age is applied to the terminal IGSW of the ECM,

and the main relay control circuit in the ECM sends

a signal to the terminal M–REL of the ECM, switch-

ing on the main relay. This signal causes current to

flow to the coil, closing the contacts of the main

relay and supplying power to the terminals +B and

+B1 of the ECM.

If the ignition switch is turned off, the ECM contin-

ues to switch on the main relay for a maximum of 2

seconds for the initial setting of the IAC valve.

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DIAGNOSTIC CHART

DIAGNOSTIC

CHART

See next page for the DIAGNOSTIC CHART.

EG–420

–ENGINE TROUBLESHOOTING CIRCUIT INSPECTION

Toyota 3VZ–FE User Manual

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