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Re: How can I know that the Battery Maintenance System is...
Hai dud,
A battery maintenance system for charging, analyzing, discharging and conditioning of a NiCad battery. The system displays voltage and capacity to determine whether or not a NiCad battery has enough capacity to power equipment for an optimal time period. The system charges the battery using a negative delta voltage method of detecting full charge, while also displaying instantaneous battery voltage. The system also analyzes the battery in a charge, discharge and recharge mode of operation, and during the charge mode the instantaneous voltage is displayed. The discharge mode discharges the battery to one volt per cell while displaying voltage and accumulative capacity alternately. The system also conditions batteries by cycling a battery through three cycles of charging, discharging and a subsequent recharge cycle. Hope it Helped You!
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The main hybrid battery used in the Toyota Prius hybrid, including the Prius Alpha, is a high-voltage nickel-metal hydride (NiMH) battery pack. Unlike regular maintenance that involves adding water, this battery pack does not require such maintenance. However, there is a smaller 12-volt auxiliary battery that is responsible for powering the accessories and starting the car, which may require maintenance.
Here are some steps to troubleshoot and address the issue:
Check the Auxiliary Battery Health:
Start by having the 12-volt auxiliary battery tested to ensure it's holding a charge and functioning properly. If the auxiliary battery is old or not holding a charge, it may need to be replaced.
Inspect Battery Terminals:
Ensure the battery terminals are clean and securely connected. Dirty or corroded terminals can prevent the battery from charging and delivering power.
Charge the Auxiliary Battery:
If the battery is low on charge, you can charge it using an appropriate battery charger. Make sure to follow the charger's instructions and safety precautions.
Check Charging System:
Ensure that the vehicle's charging system (alternator) is functioning correctly. If the alternator is not charging the auxiliary battery properly, it may need to be repaired or replaced.
Consult a Professional:
If the issue persists or if you're unsure about handling electrical components, it's best to consult a professional mechanic or a Toyota service center. They can diagnose the issue accurately and provide appropriate solutions.
Remember, the main hybrid battery (the one that powers the electric drive) in a Toyota Prius is sealed and does not require adding water. It's the 12-volt auxiliary battery that might need maintenance or replacement.
Question edited for clarity.
Question moved to model category.
Jeff's great answer ^^^Up There^^^ is better down here as a Solve.
Jeff Armer Aug 20, 2022
With it running test voltage at the battery. Sounds like it's not charging the battery. Had alternator check? is good, but that doesn't mean it's working in the car. The charging system in your vehicle is computer controlled, is the battery light lit in the instrument cluster ? Could have DTC'S - diagnostic trouble codes stored . Do you know if your car has regulated voltage control or is a none regulated voltage control system.
Charging System Description and Operation (w/RVC)
Electrical Power Management (EPM) Overview
The electrical power management (EPM) system is designed to monitor and control the charging system and send diagnostic messages to alert the driver of possible problems with the battery and generator. This EPM system primarily utilizes existing on-board computer capability to maximize the effectiveness of the generator, to manage the load, improve battery state-of-charge (SOC) and life, and minimize the system's impact on fuel economy. The EPM system performs 3 functions:
• It monitors the battery voltage and estimates the battery condition.
• It takes corrective actions by adjusting the regulated voltage.
• It performs diagnostics and driver notification.
The battery's condition is estimated during key-off and during key-on. During key-off the SOC of the battery is determined by measuring the open-circuit voltage. The SOC is a function of the acid concentration and the internal resistance of the battery, and is estimated by reading the battery open circuit voltage when the battery has been at rest for several hours.
The SOC can be used as a diagnostic tool to tell the customer or the dealer the condition of the battery. Throughout key-on, the algorithm continuously estimates SOC based on adjusted net amp hours, battery capacity, initial SOC, and temperature.
While running, the battery's degree of discharge is primarily determined by a battery current sensor, which is integrated to obtain net amp hours.
In addition, the EPM function is designed to perform regulated voltage control (RVC) to improve battery SOC, battery life, and fuel economy. This is accomplished by using knowledge of the battery's SOC and temperature to set the charging voltage to an optimum battery voltage level for recharging without detriment to battery life.
The Charging System Description and Operation is divided into 3 sections. The first section describes the charging system components and their integration into the electrical power management (EPM). The second section describes charging system operation. The third section describes the instrument panel cluster (IPC) operation of the charge indicator, driver information center (DIC) messages, and voltmeter operation.
Charging System Description and Operation (w/o RVC)
Circuit Description
The generator provides voltage to operate the vehicle's electrical system and to charge its battery. A magnetic field is created when current flows through the rotor. This field rotates as the rotor is driven by the engine, creating an AC voltage in the stator windings. The AC voltage is converted to DC by the rectifier bridge and is supplied to the electrical system at the battery terminal.
When the engine is running, the generator turn (on) signal is sent to the generator from the powertrain control module (PCM), turning ON the regulator. The generator's voltage regulator controls current to the rotor, thereby controlling the output voltage. The rotor current is proportional to the electrical pulse width supplied by the regulator. When the engine is started, the regulator senses generator rotation by detecting AC voltage at the stator through an internal wire. Once the engine is running, the regulator varies the field current by controlling the pulse width. This regulates the generator output voltage for proper battery charging and electrical system operation. The generator F-terminal is connected internally to the voltage regulator and externally to the PCM. When the voltage regulator detects a charging system problem, it grounds this circuit to signal the PCM that a problem exists. The PCM monitors the generator field duty cycle signal circuit.
Charging System Indicator
The instrument panel cluster (IPC) illuminates the charge indicator in the message center when the following occurs:
• The powertrain control module (PCM) detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a serial data message from the PCM requesting illumination.
• The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a serial data message from the body control module (BCM) indicating the system voltage.
• The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
• The ignition is ON, with the engine OFF.
Did you test for battery voltage on larger wire on the back of the alternator - could have a bad wire -corrosion inside you can't see . Could also have blown fusible link on that wire - comes from the starter B+ post.
Battery could be bad. A bad battery can sometimes show a surface charge (voltage) on monitoring system, but when you go to use it nada happens because it has no current.
Have your charging system tested. The battery light is turned on when there is a charging system problem causing an over/under charge condition. You may possibly have an alternator problem. If the battery is not being charged properly, the computer will start shutting down electrical components for protection and to keep enough voltage supply to enable the vehicle to continue running
Your probably going to need to take to a dealer for this , I don't how much you know about modern automotive charging systems . Plus it would help to have a professional scan tool ! The charging system on you vehicle is computer controlled !
The engine control module (ECM) controls the generator through the generator L-terminal control circuit. The signal is a 5-volt pulse width modulation (PWM) signal of 128 Hz with a duty cycle of 0-100 percent. Normal duty cycle is between 5-95 percent. Between 0-5 percent and 95-100 percent are for diagnostic purposes. The following table shows the commanded duty cycle and output voltage of the generator:
The BATTERY SAVER ACTIVE message will display on the driver information center (DIC) when the vehicle enters a load shed 2 event. Refer to for load shed 2 setting criteria.
The electrical power management (EPM) system is designed to monitor and control the charging system and send diagnostic messages to alert the driver of possible problems with the battery and generator. This EPM system primarily utilizes existing on-board computer capability to maximize the effectiveness of the generator, to manage the load, improve battery state-of-charge (SOC) and life, and minimize the system's impact on fuel economy. The EPM system performs 3 functions:
It monitors the battery voltage and estimates the battery condition.
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It takes corrective actions by adjusting the regulated voltage.
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It performs diagnostics and driver notification
Load Shed 2 Start
--
Less Than 10.9 V
Battery has a net loss greater than 12 AH
Rear defrost, heated mirrors, heated seats cycled OFF for 50% of their cycle. The BATTERY SAVER ACTIVE message will be displayed on the DIC.
You have a charging problem or battery problem !
you need to run a multi meter on your alternator to see if its providing a charge to the battery.your manual will have the specs for the voltage that the alternator should provide.
The digital display shows "FLO" to indicate that the unit is in float charge mode. The battery "fully charged" icon will display on the LCD screen and the arrows pointing to the "+" and "-" will flash. In this mode, the unit monitors the battery voltage and charges as necessary to assure the battery maintains full capacity. The unit remains in float charge mode as long as the charger is connected to the battery and plugged into a functioning AC outlet. I hope this has answered your question.
Charging System Failure
Refer to Charging System Description and Operation
Electrical Power Management (EPM) Overview
The EPM system is designed to monitor and control the charging system and send diagnostic messages to alert the driver of possible problems with the battery and generator. This EPM system primarily utilizes existing on-board computer capability to maximize the effectiveness of the generator, to manage the load, improve battery state-of-charge (SOC) and life, and minimize the system's impact on fuel economy. The EPM system performs three functions:
• It monitors the battery voltage and estimates the battery condition.
• It takes corrective actions by adjusting the regulated voltage.
• It performs diagnostics and driver notification.
The battery's condition is estimated during key-off and during key-on. During key-off the SOC of the battery is determined by measuring the open-circuit voltage. The SOC is a function of the acid concentration and the internal resistance of the battery, and is estimated by reading the battery open circuit voltage when the battery has been at rest for several hours.
The SOC can be used as a diagnostic tool to tell the customer or the dealer the condition of the battery. Throughout key-on the algorithm continuously estimates SOC based on adjusted net amp hours, battery capacity, initial SOC, and temperature.
While running, the battery's degree of discharge is primarily determined by a battery current sensor, which is integrated to obtain net amp hours.
In addition, the EPM function is designed to perform regulated voltage control (RVC) to improve battery SOC, battery life, and fuel economy. This is accomplished by using knowledge of the battery's SOC and temperature to set the charging voltage to an optimum battery voltage level for recharging without detriment to battery life.
The Charging System Description and Operation is divided into 3 sections. The first section describes the charging system components and their integration into the EPM. The second section describes charging system operation. The third section describes the instrument panel cluster operation of the charge indicator, driver information center messages and voltmeter operation.
Charging System Failure
The BCM and the ECM/PCM will send a class 2 message to the IPC for the CHARGING SYSTEM FAILURE message to be displayed. It is commanded ON when a charging system DTC is a current DTC. The message is turned off when the conditions for clearing the DTC have been met.
You need to have a full vehicle scan done. Not just engine code's . An to do this you need a professional scan tool , not auto zone or advance etc.. Your best bet , take it to a qualified repair shop.
Your charging system is computer controlled . Do you know what DTC'S - diagnostic trouble code's are ? This are all associated with the charging system inone way or another .
DTC B1327
DTC B1328
DTC B1516
DTC P0560
DTC P0562
DTC P0563
DTC P0615
DTC P0621
DTC P0622
You would have to check the voltage from the adapter to verify proper voltage to rule out the power supply. Since the laptop is on and functioning, I would assume that the charger is working fine. Just based on my experience I would say the battery isn't any good, either bad cells, old, or both. Do you know of anyone who has the same battery that you can test?
Also, however unlikely, it may be the charging system itself, which would be a costly motherboard repair.
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