Transfer low high switch

**sierrafery** · 26th March 2018, 10:56 PM

Originally Posted by shack

....but I'm fairly sure that pin 33 on the red engine ecu connector needs to be earthed to run in high range,

That's what you know the other way around

Originally Posted by TRANSFER BOX - LT230SE - DESCRIPTION AND OPERATION 41-15

High/low detect switch
A high/low detect switch is fitted in the front output housing and connects to earth when low is selected. The switch is
connected to the engine ECM, the SLABS ECU and the EAT ECU. The purpose of the switch is to enable selection
of the hill descent feature and to modify the engine fuelling and automatic gearbox gearshift maps stored within the
respective ECM's and ECU's.

**shack** · 26th March 2018, 11:02 PM

Originally Posted by sierrafery

That's what you know the other way around

Thanks, I'll have to check out what we did, too long ago now....

**sierrafery** · 26th March 2018, 11:19 PM

No probs, it happens, for me it was exactly the other way around as the switch got stuck closed and i've spent ages to figure out why i had a very ''agressive'' throttle, black smoke and high EGT as the ECU was on the low range fuel map while the gear in high...since then i fitted a LED in front of the lever on that sticker so the LED comes on when there's earth on that wire cos it can happen that the switch to not close when low is selected then the engine will be powerless in low gear... too bad that LR didnt do a warning on dash for this switch

**Noisy** · 27th March 2018, 08:41 AM

[QUOTE=sierrafery;2789807]No probs, it happens, for me it was exactly the other way around as the switch got stuck closed and i've spent ages to figure out why i had a very ''agressive'' throttle, black smoke and high EGT as the ECU was on the low range fuel map while the gear in high...since then i fitted a LED in front of the lever on that sticker so the LED comes on when there's earth on that wire cos it can happen that the switch to not close when low is selected then the engine will be powerless in low gear... too bad that LR didnt do a warning on dash for this switch[/QUOTE

My car has always seemed sluggish to me never driven another one so cant compare, and hills are a nightmare and i always reckon low gear felt more responsive too me i am wondering if mine is stuck in low too, will have to have a look at the switch i guess

**shack** · 27th March 2018, 10:25 AM

Originally Posted by sierrafery

No probs, it happens, for me it was exactly the other way around as the switch got stuck closed and i've spent ages to figure out why i had a very ''agressive'' throttle, black smoke and high EGT as the ECU was on the low range fuel map while the gear in high...since then i fitted a LED in front of the lever on that sticker so the LED comes on when there's earth on that wire cos it can happen that the switch to not close when low is selected then the engine will be powerless in low gear... too bad that LR didnt do a warning on dash for this switch

Just had five to check mine and you are
Indeed correct, don't know what I was thinking...
And yeah it would be beneficial to have a light,I guess if you are in low but the Hdc won't work, it's a tell tale sign...

Do you know which maps exactly are called on when selecting low range?
Obviously the throttle reacts differently, there are no doubt others as well

**DazzaTD5** · 27th March 2018, 10:35 AM

A simple test if you think the switch is stuck...

While in high range gear, press hill decent button, if the light flashes and beeps continuously then the switch is working.
In low range gear the light will be solid.

**Noisy** · 27th March 2018, 11:00 AM

Originally Posted by shack

Do you know which maps exactly are called on when selecting low range?
Obviously the throttle reacts differently, there are no doubt others as well

From my limited research it says it adjusts the fuel, the shifting in the auto and throttle response

Thread: Transfer low high switch

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