L405 2014 3.0 start stop not working wven after new battery

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bertone902

bertone902

Member
Posts
89
Location
yorkshire
Evening guys . Right so I've acquired another landrover . It's an l405 3.0 on a 2015 plate.

Bought the car with a start stop not functioning message on dash . So tested the aux battery and was flat as a fart. So stuck a new one on and message went away. When I press button it turns on and says it's active . However it never turns off . I've tried all the usuall like nit using the aircon etc etc as I've read it can stop it working etc. Anyways here's the weird bit ! Got a puncture today and stuck the spare wheel on... driving with that on ...the start stop started working !
As a joke I said must have knocked something and then hoped when I put the proper wheel back in it would stay working ... long story short. The weird **** happened!
Soon as the proper size wheels back on it stopped working ! 😂😂 any ideas apart from limping round on a spare wheel ? 😂😂
 
The aux. battery isn't the one the autostop uses, it only uses the starter battery. The aux. battery is there to supply 'voltage sensitive' circuits during cranking, it is monitored for condition, but so is the starter battery. I have no idea why changing wheels had a bearing upon autostop working - it shouldn't, unless as you say, the battery monitor wiring is damaged / dislodged and has been affected by the wheelchange. Maybe worth getting the BMS' checked for fault codes (it will register if there have been any failures in monitoring) and a reset done if not already.
 
This might help determine if the behaviour is due to something other than (either) battery condition:-
VEHICLES WITH AUTO STOP/START SYSTEM
During a drive cycle, with the Auto stop/start system enabled and the TCS
in DRIVE ('D') or SPORT ('S'), the ECM performs an auto stop when one of
the following occurs:

The vehicle stops from a speed greater than 4 km/h (2.5 mph) and
sufficient brake pressure is applied to the brake pedal to ensure the
vehicle is stationary
The vehicle is stationary and 'N' is selected on the TCS.

NOTE:

The green Auto stop/start warning indicator in the IC illuminates to advise
that the engine has shut down. Other warning indicators normally
associated with an engine shut down, for example the ignition and low oil
pressure warning indicators, are suppressed so will not illuminate during an
auto stop.

During an auto stop, the ECM operates the fuel pressure control valve to

On a gradient an auto stop will only occur if the driver applies a
minimum of 7 bar (101.5 lbf/in²)+ / - 3 bar (43.5 lbf/in²) brake pressure
and will not occur at all on gradients about in excess of 1 in 4.34
(23%).


maintain a fuel rail pressure of 250 bar (3625 lbf/in²), instead of releasing the
fuel pressure as normally occurs at engine shut down. This ensures there is
adequate fuel volume and pressure for an instant auto restart.

The following conditions will prevent an auto stop:

A steering wheel paddle switch has been used to select a gear
(transmission Commandshift mode)
The ambient air temperature is outside the range of 2 to 40 °C (36 to 104
°F)
The ambient air pressure is below 720 hPa
The engine coolant temperature is outside the range of 20 to 107 °C (68
to 224 °F)
Brake vacuum is less than the threshold value
The hood is open
The driver door is open
The driver seatbelt is not fastened
High demand from the climate control system requires the engine to be
running, for example windshield demist selected
The battery charge is low
A Terrain Response® special program is active
Hill descent control is active
The level in the fuel tank is too low (approximately 6 liters remaining in
tank)
Active regeneration of the Diesel Particulate Filter (DPF) is required or in
progress
Auto stop/start system is disabled using the Auto stop/start switch.

While the vehicle is stationary, if a condition that prevented an auto stop is
removed the ECM automatically performs an auto stop.


The ECM automatically restarts the engine when one of the following
occurs:

The brake pedal is released with 'D' or 'S' selected on the TCS.
The accelerator pedal is pressed
A paddle switch is used to select a gear
REVERSE ('R') is selected on the TCS
Climate control system demand increases
The vehicle speed exceeds approximately 1 km/h (0.5 mph)
The battery charge becomes low
Brake vacuum reduces below the threshold value
Auto stop/start system is disabled using the Auto stop/start switch.
 
Graculus said:
This might help determine if the behaviour is due to something other than (either) battery condition:-
VEHICLES WITH AUTO STOP/START SYSTEM
During a drive cycle, with the Auto stop/start system enabled and the TCS
in DRIVE ('D') or SPORT ('S'), the ECM performs an auto stop when one of
the following occurs:

The vehicle stops from a speed greater than 4 km/h (2.5 mph) and
sufficient brake pressure is applied to the brake pedal to ensure the
vehicle is stationary
The vehicle is stationary and 'N' is selected on the TCS.

NOTE:

The green Auto stop/start warning indicator in the IC illuminates to advise
that the engine has shut down. Other warning indicators normally
associated with an engine shut down, for example the ignition and low oil
pressure warning indicators, are suppressed so will not illuminate during an
auto stop.

During an auto stop, the ECM operates the fuel pressure control valve to

On a gradient an auto stop will only occur if the driver applies a
minimum of 7 bar (101.5 lbf/in²)+ / - 3 bar (43.5 lbf/in²) brake pressure
and will not occur at all on gradients about in excess of 1 in 4.34
(23%).


maintain a fuel rail pressure of 250 bar (3625 lbf/in²), instead of releasing the
fuel pressure as normally occurs at engine shut down. This ensures there is
adequate fuel volume and pressure for an instant auto restart.

The following conditions will prevent an auto stop:

A steering wheel paddle switch has been used to select a gear
(transmission Commandshift mode)
The ambient air temperature is outside the range of 2 to 40 °C (36 to 104
°F)
The ambient air pressure is below 720 hPa
The engine coolant temperature is outside the range of 20 to 107 °C (68
to 224 °F)
Brake vacuum is less than the threshold value
The hood is open
The driver door is open
The driver seatbelt is not fastened
High demand from the climate control system requires the engine to be
running, for example windshield demist selected
The battery charge is low
A Terrain Response® special program is active
Hill descent control is active
The level in the fuel tank is too low (approximately 6 liters remaining in
tank)
Active regeneration of the Diesel Particulate Filter (DPF) is required or in
progress
Auto stop/start system is disabled using the Auto stop/start switch.

While the vehicle is stationary, if a condition that prevented an auto stop is
removed the ECM automatically performs an auto stop.


The ECM automatically restarts the engine when one of the following
occurs:

The brake pedal is released with 'D' or 'S' selected on the TCS.
The accelerator pedal is pressed
A paddle switch is used to select a gear
REVERSE ('R') is selected on the TCS
Climate control system demand increases
The vehicle speed exceeds approximately 1 km/h (0.5 mph)
The battery charge becomes low
Brake vacuum reduces below the threshold value
Auto stop/start system is disabled using the Auto stop/start switch.
Click to expand...
You might have cracked it here. It's low on. Fuel. I'll go fill her up
 
They do, but it takes time - there is a charge / discharge sequence that runs every 40 days (from memory), it's reasonably transparent but can give the impression there is a charging problem if you happen to take a voltage reading during the discharge phase.
 
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