Description

To ensure the accuracy of the EVAP (Evaporative Emission) monitor values, the soak timer, which is built into the ECM, measures 5 hours (+-15 minutes) from when the ignition switch is turned OFF, before the monitor is run. This allows the fuel to cool down, which stabilizes the EVAP pressure. When 5 hours have elapsed, the ECM turns on.

Ignition Switch

'FL MAIN

EFI MAIN

Battery

EFI MAIN

IGSW

Soak Timer IC

MREL

Power Source IC

Main Relay Control IC

A127272E01

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