Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
VC Output Circuit: Description
The ECM (Included in the hybrid vehicle control ECU) constantly generates 5 V power from the battery voltages supplied to the +B (BATT) terminal to operate the Micro-processor. The ECM also provides this power to the sensors through the VC output circuit.
When the VC circuit is short-circuited, the Micro-processor in the ECM (included in hybrid vehicle control ECU) and sensors that are supplied with power through the VC circuit are deactivated because the power is not supplied from the VC circuit. Under this condition, the system does not start up and the MIL does not illuminate even if the system malfunctions.
HINT:
Under normal conditions, the MIL is illuminated for several seconds when the power switch is first turned on. The MIL goes off when the hybrid vehicle is started.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.