Hi,
PradoGXLV6 kindly shared his excellent auto transmission temperature gauge. I come from an electrical engineering background so I have a different approach.
Recently, I was able to purchase the Prado workshop manual on CD and from this I was able to glean that the D4D auto Prado has two temperature sensors in the 750 gearbox. Access to either (or both) of these is straight-forward at the connector to the transmission computer under the dashboard.
I designed a simple circuit using a dual op amp, a LED panel volt meter from Jaycar ($30) and a 5V to 5V DC-DC converter ($20), also from Jaycar. Total cost was $70 plus a bit of time to assemble it on some vero-board.
The input impedance from the temperature sensor to the op amp is extremely high so that there is absolutely no impact on the vehicle's transmission computer.
The advantage of using one of the Prado's existing temperature sensors is that you don't have to cut any oil hoses or have to remove the drain plug to fit a sensor. (I hate mess!) It's also cheaper to use the perfectly good Yota device.
If anyone is interested in the circuit, please email me and I will sketch it out a bit more tidily than what it is at present.
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[img]
Regards
Glenn[/img]
PradoGXLV6 kindly shared his excellent auto transmission temperature gauge. I come from an electrical engineering background so I have a different approach.
Recently, I was able to purchase the Prado workshop manual on CD and from this I was able to glean that the D4D auto Prado has two temperature sensors in the 750 gearbox. Access to either (or both) of these is straight-forward at the connector to the transmission computer under the dashboard.
I designed a simple circuit using a dual op amp, a LED panel volt meter from Jaycar ($30) and a 5V to 5V DC-DC converter ($20), also from Jaycar. Total cost was $70 plus a bit of time to assemble it on some vero-board.
The input impedance from the temperature sensor to the op amp is extremely high so that there is absolutely no impact on the vehicle's transmission computer.
The advantage of using one of the Prado's existing temperature sensors is that you don't have to cut any oil hoses or have to remove the drain plug to fit a sensor. (I hate mess!) It's also cheaper to use the perfectly good Yota device.
If anyone is interested in the circuit, please email me and I will sketch it out a bit more tidily than what it is at present.
[/img]
[img]
Regards
Glenn[/img]
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