alyways annoyed that you cant find the info on how to test this stuff people never post in plain english
so heres what i know
P154A (battery sensor internal failure) stored. In this case, the battery sensor has an internal failure and must be replaced.
here is the test steps
pin 1 blue = lin bus square wave
pin 2 red = battery voltage
pin 3 green = faint ground signal
yellow at alternator same as blue wire
SENSOR NOW WORKS WHEN THE HEAD LIGHTS ARE TURNED ON ONLY
THE BATTERY VOLTAGE IS NOW AT 14.3V
ELD VALUE IS 213.5 AMPS
BATTERY CURRENT SENSOR IS 15.7AMPS
WHEN HEAD LIGHTS ARE TURNED OFF THE BATTERY VOLTAGE GOES DOWN TO 12.3VOLTS NO OTHER WAY TO GET VOLTAGE UP
TST DRIVE VEHICLE TO CHECK ALTERNATOR VOLTAGE OUTPUT
both square waves will be the same
if not the same wiring issue
if the same alternator is not charging then the alternator is no good.
if the alternator is charging and the signals the same the sensor is no good.
Wiring on the sensor its self
Honda battery sensor – resistance testing with sensor out of car – this was not correct for my vehicle unless the plug is up side down (we are in Australia)
i have 2.75M ohms on both pin 1 and pin2 ??????????????????????
After all that here is what I have measured when I bit the bullet and bought a new one
On CX5s and other Mazda’s with the i-stop system, i-stop may not activate after the battery has been replaced or was disconnected during some servicing.
In this case you will either need to ask your dealer to reset it, which they can by connecting up to the diagnostic system, or you can do it yourself. listed belowRead More