The ECM constantly generates 5 V power from the battery voltage supplied to the +B (BATT) terminal to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit.
From MAIN Fuse From EFI Fuse
Throttle Position Sensor, Accelerator Pedal Position Sensor, etc. (Sensors which have IC)
Engine Coolant Temperature Sensor, Intake Air Temperature, etc.
5 V Constant Voltage Circuit
When the VC circuit is short-circuited, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are inactivated 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 ignition switch is first turned ON. The MIL goes off when the engine is started.
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