Search results

I've never heard of making a relay with a test point, any details on how you did it?

Good job on illustrations.

I guess we're going to keep at it. The issue of the common starter crank signal between the aux battery and the main battery indicating a connection between them had to be resolved, once I resolved that as the common ground wire, I agreed that the batteries were disconnected and there was never...

No, if the PCM detects the aux battery is bad it sets the PF00D, disables ESS and lights the error light. I brought this up here in post 159., https://www.jeepgladiatorforum.com/forum/threads/are-the-batteries-really-isolated-during-ess-stops.87524/post-1624343

Good work, I nominate you for the Nobel peace prize of this thread. Where did you ground your probes, main battery negative or body?

You provided factory documentation that states the PCR closes and the batteries are reconnected after 20-40ms of the ESS restart. If the documentation is correct, wouldn't you see the battery voltages merge after 20-40ms. How much deviation will there be between traces and how many traces...

The battery is rated at 200 amps due to it's internal resistance, where does 10x current come from?

And yet we know that the N3 fuse blows almost instantaneously when the aux battery positive cable is shorted to ground, is that due to a residual charge like I referred to earlier in this thread?

I see your point, 100ms and the batteries are still separated, seemingly contrary to the previously posted documentation of 20-40ms.

Is this the same math that has 250 amps going through a 150 amp fuse?

For years the reason given for adding the aux battery was to provide additional power for the ESS restart. This made sense because at the time the Cherokee had the original single battery ESS system and Cherokees were getting stranded at intersections when the single battery crossed the failure...

It may be difficult for @J Sierra to capture an ESS start with his AC powered scope. But he did find easy access to the PCR control signal from the fuse panel, so anyone with a 2 channel handheld scope should be able to capture the PCR and the aux battery and/or the PCR and the main battery...

Looks good, another cold start image?. Tektronix TDS2014B 100MHz 1GS/s Four Channel Digital Storage Oscilloscope? Looks like it runs on AC, are you going to be able to drive with it hooked up to get an ESS event restart?

I was specifically referring to the cold "initial key" start as specified in these details, when the batteries are separated prior to starter engagement. It gives an approximate voltage, but it states it's testing for a PCM reset. If the PCM resets, the Aux battery fails the test. This...

From my reading of information you provided in an earlier post, it's not reading any voltages during the cold start testing, it's just determining if the aux battery has enough power so the PCM doesn't reset when the PCR opens. And these "Set Conditions:" are probably one of the more...

It looks like the terminal you found follows the expected behavior of the PCR, so good find. Is this the terminal? And thanks for the oscilloscope image, the third channel further verifies the cold start behavior. Did you happen to get a 3 channel image of the ESS restart?

Kirchhoff's Voltage law states that the sum of voltages around a closed loop is equal to 0 V. The way the batteries are connected creates 3 closed loops. Your voltage readings are from the terminals to body ground and since you are calculating for the loop between the batteries, you have to at...

I have an original version of that diagram, this one has been updated (GPEC5) and is easier to read.

It looks like a spring assist for closing the contacts. There's a 1,000,000,000 ohm resistor across the control inputs. I can run it over if you want to see it in person before I seal it up for installation.

The Aux is connected to the starter through a 150A fuse, so maybe not over 250A. I also did some additional testing and can confirm that the residual capacitive charge in the system electronics is not capable of sustaining the initial high voltage during an ESS stop as I previously suggested...