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Home >> Toyota >> 2019 >> Highlander XLE, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 23 (SFI System [1AR-FE] - Diagnostics & Circuit Tests - (Except Hybrid)) >> SFI System >> Circuit Tests >> VC Output Circuit [12/2013 - ] >> Description

VC Output Circuit [12/2013 - ]: Description

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The ECM constantly generates a 5 V power source voltage from the battery voltage supplied to the +B (BATT) terminal to operate the microprocessor. The ECM also provides this power source voltage to the sensors through the VC output circuit.

Fig 1: VC Output Circuit
GTY430240Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

When the VC circuit has a short circuit, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are deactivated because power is not supplied from the VC circuit. When the system is in this condition, it will not start.