Strange gas gauge event

[flymore]

Not sure where to post this and it could be/hope it's just a fluke.

 

Filled up my 2018 Edge the other day like I always do, put in the gas filler till it clicked off.

After driving off, noticed the gauge read 3/4. Oh well I thought I'll just fill it up next time. Must have clicked off early.  Ran some errands wasn't paying attention to the gauge. Got home Wife and I went out started it for another short trip and gauge read full. It's been going down normally since.  Hope the float didn't get stuck.

 

Anybody else had anything like this?

 

Thanks 

[omar302]

There is an "Anti-Slosh" mode to make the fuel gauge work smoothly. If during refueling the ignition was turned off or transmission shifted it might have prompted the anti-slosh mode to kick in resulting in fuel gauge not responding fully to the actual filled fuel amount. Then recovery mode corrected the reading later on.

 

Quote

Fuel Gauge
The IPC sends a reference voltage to the fuel level sender(s). As the fuel level changes, a float actuates the variable
resistor fuel level sender, raising or lowering the fuel level signal voltage. The IPC monitors the changes in voltage from
both senders and commands the fuel gauge with a corresponding movement of the pointer.
After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes
depending on which operating mode the fuel gauge is in.
The IPC uses 4 different operating modes to calculate the fuel level:
Antislosh
(default mode)
Key OFF fueling
Key ON fueling
Recovery
The default fuel gauge mode is called the antislosh
mode. To prevent fuel gauge changes from fuel slosh (gauge
instability due to changes in fuel sensor readings caused by fuel moving around in the tank), the fuel gauge takes
approximately 40 minutes to go from empty (E) to full (F).
The key OFF fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions to be met:
The ignition must be in the OFF mode when refueling the vehicle.
At least 6% of the vehicle's fuel capacity must be added to the fuel tank.
The IPC must receive a valid ignition ON fuel sensor reading within one second of the ignition being put into the
RUN mode. The key ON sample readings are considered valid if the fuel sensor reading is between 10 ohms ± 2
ohms and 180 ohms ± 4 ohms.
If these conditions are not met, the fuel gauge stays in the antislosh
mode, which results in a slow to read full (F) event.
The key ON fueling mode (approximately 60 seconds to read empty [E] to full [F]) requires the following conditions be
met:
The transmission is in PARK (P) or NEUTRAL (N).
The ignition is in the RUN mode.
At least 6% of the vehicle's fuel capacity must be added to the fuel tank In key ON fueling mode, a 30second timer activates after the transmission is put into the PARK (P) or NEUTRAL (N) position. When the 30second time has elapsed and at least 9% of the vehicle's fuel capacity has been added, the fuel gauge response time is 60 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P)  or NEUTRAL (N), the fuel gauge strategy reverts to the antislosh mode. The key ON fueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the ignition in the RUN mode.
Recovery mode is incorporated into the IPC strategy to recover from a missing fuel level input after a refueling event.
Missing fuel level inputs result from intermittent opens in the fuel sensor or its circuits. Recovery mode (empty [E] to full [F] approximately 17 minutes) is initiated when the following 2 conditions are met:
The IPC is in the antislosh (default) mode.
The actual fuel level in the tank is 5% different from what is being displayed by the fuel gauge.

 

 

Instrument Panel Cluster (IPC) - System Operation and Component Description.pdf

Edited October 5, 2019 by omar302

[flymore]

Wow interesting!

 

Thanks