HO2S Heater Control Circuit Low Bank 1 Sensor2
symptoms
Other than the MIL light illuminating you may not notice any performance issues.
cause
A short in the O2 sensor heater circuit or the sensor itself
A faulty O2 sensor heater
Wiring or connectors are broken or frayed to the sensor or relay
Bad PCM or ECM
The fix
Correct wiring short or loose connector found in inspection.
and/or
Replace the bank 1 sensor 2, O2 sensor
Replace PCM if circuit has failed and no wiring issues present, good O2 sensor
No. A zener diode is a voltage limiter. Circuit design might create a current limiting response, but the basic control is voltage, not current.
By Kirchhoff's Voltage Law, the sum of the voltage drops around the series circuit will equal the voltage applied to the circuit.
Do a voltage test. Start at one end of the circuit and progress along device by device. If there is voltage on the down stream side of the device move on to the next. If there is no voltage on the down stream side of the device then go up stream of the device. If you have voltage there then the current device that you are at is the problem causing an open or broken circuit.
Voltage Rise : The energy added to a circuit. Voltage drop: The energy removed from the circuit.
this is the amount of voltage a circuit can hold.
The circuit voltage is too high. Could be a failed sensor, wiring short, or PCM problem.
Voltage is impressed across a circuit. Current flows through a circuit.
A mercury battery will provide constant voltage. A voltage regulator circuit will also.
A voltage error circuit is called an error amplifier and happens when there are discrepancies between the voltage output and the reference voltage. A current error circuit happens when there is a disruption of flow in an ammeter.
There is no particular benefit for having a higher open-circuit (or 'no-load') voltage. In fact, an ideal voltage source would have no internal resistance and, therefore, its open-circuit voltage would be identical to its closed-circuit voltage.
Voltage = (current) x (resistance) Current = (voltage)/(resistance) Resistance = (voltage)/(current)
Voltage drop due to the resistance present in the series circuit causes voltage split over a series circuit.