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
Previous Repairs, and the short story
The vehicle was delivered to us after talks about the original issue with the vehicle, which was poor performance and fuel trims high +45.
During the Conversation about the vehicle it was decided that a new air flow meter be installed and the vehicle test driven to confirm the fuel trims are coming back into line (+ or – 6%)
The vehicle was fitted with a new aftermarket air flow meter and fuel trims checked on the test drive.
Ford Falcon body control modules FG1 & FG2
A vehicle came in this week and BCM replaced with new unit supplied from ford, a local locksmith had carried out key programming and parameter reset, got the vehicle started (cool)
Post starting the vehicle, the vehicle locks did not work correctly and the BCM configuration thought it was a 4wd and a wagon ( no way)
1. the door ajar switch is open when door closed and closed when door open.
so the BCM is wired differently or opposite in the FG2 Compared with the FG1
Commodore as notorious for leaking every where in the A/C system, many times it can be found by green dry leaking oil and giving a witness mark where to find the leakRead More
Vehicle came in stolen and recovered, and an engine assessment had to be done using E-scan we where able to conduct a relative compression test from one port after removing the fuel pump fuse in the boot fuse box
This is all well and good when the engine goes well and there is no issues we we decided to conduct a fuel trim test to make sure the engine was running good through the rpm range
After this an Astra engine came in on a tow truck after it just stopped on the road, the engine sounded funny when cranking so again a relative compression test was Carried out
Even though the pc told us this was ok I decided to not believe the pc relative compression test as the graph didnt look quite right, out with a spark plug and we found cyl1 – 0 Psi, Cyl2 – 50 Psi, Cyl3 – 0 Psi Cyl4 – 0 Psi
So it just goes to show you go with your guts and do things manually when your guts tells you something, but I learned the differences in the graphs this Astra direct injection engine, had a snapped chain….
And we will know faster next time. Faster at servicing and repairing vehicles in seven hills NSW