How many volts does a Honda alternator need?
Even though a typical lead-acid battery is considered fully charged at 12.6 volts, many of the early smart Honda systems were designed to see 12.4 volts, or 80% state-of-charge, as perfectly normal and the ECM would not command alternator charging.
Where is the ELD on a Honda alternator?
When the alternator reports a problem to the ECM, the ECM sets a trouble code and communicates digitally with the gauge control module to light the BATTERY light on the instrument cluster. The ELD inside the fuse box or at the battery terminals.
How does the alternator work in a smart charger?
First generation ELDs monitored battery voltage and amperage flowing to and from the battery fuse box or the positive or negative battery cable (the ELD placement varied by year and model). In these early smart charging systems, the ECM is the “master” and the alternator is the “slave” following commands from the ECM.
What should the charging voltage be on a Honda alternator?
The ECM set a charging voltage of 12.5-14.5-volts. The internal voltage regulator monitors the alternator output and reports it to the ECM. If the actual voltage didn’t match the commanded output, the ECM sets a P0562 (P1297) voltage too low or PP1549 for voltage too high.
When the alternator reports a problem to the ECM, the ECM sets a trouble code and communicates digitally with the gauge control module to light the BATTERY light on the instrument cluster. The ELD inside the fuse box or at the battery terminals.
How many wires are involved in a Honda Charger?
The fourth is the charging rate input to the ECM (the blue or yellow wire).The fifth is an output from the ECM (white with a yellow stripe).This is the control circuit that turns the alternator on through the voltage regulator. There are a total of three wires to the computer that are involved in the charging system.
What does the C circuit on a Honda Charger mean?
This signals the computer that the battery is fully charged and that overall electrical demand is low. When this happens, the computer can turn off the alternator through the one computer output, the C circuit (white wire with a yellow stripe).This is the one circuit where the computer turns the alternator on and off.