Audible Coolant Alarm w/ Idiot Light Option (1 Viewer)
- Thread starter Lutz Auto
- Start date
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Lutz Auto
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- Thread starter
- #22
This kit has evolved a bit and will be live soon. It has been upgraded from the prototype that I posted initially. It now has a nice calibration feature and PCB case.
It will work on any Toyota/Lexus vehicle that uses part #83420-16040 for the gauge sensor. This means 93-97 FZJ80 (and all diesels) for the 80 series.
www.lutzauto.com
Notes for those interested:
I realized during testing that the factory gauge has no compensation for supply voltage, so when the alternator is charging, the factory gauge will actually read significantly different than when the system is not charging (this is the case for modded and unmodded factory gauges). I added the ability for the coolant alarm to adjust based on the supply voltage so that it will always go off at the calibration point regardless of battery voltage.
I also added a calibration procedure that must be performed to record the proper setpoint. This ensures that the setpoint is accurate across small differences between different vehicles. In order to calibrate, you need to disconnect the gauge sensor in the engine bay (part# 83420-16040), turn the key to the on position, then hold the calibration button on the circuit board for a few seconds. A sound will confirm the calibration and you can reconnect the gauge coolant sensor in the engine bay.
It will work on any Toyota/Lexus vehicle that uses part #83420-16040 for the gauge sensor. This means 93-97 FZJ80 (and all diesels) for the 80 series.
Coolant Overheat Alarm for Select Toyota/Lexus Vehicles | Lutz Auto
Do you ever let your kids or loved ones drive your newly rebuilt ride? Ever wonder whether they would notice if the engine was overheating? This kit is for you..The Lutz Auto Toyota/Lexus Coolant Alarm works with select Toyota and Lexus vehicles that use Toyota/Lexus part # 83420-16040 for the...
www.lutzauto.com
Notes for those interested:
I realized during testing that the factory gauge has no compensation for supply voltage, so when the alternator is charging, the factory gauge will actually read significantly different than when the system is not charging (this is the case for modded and unmodded factory gauges). I added the ability for the coolant alarm to adjust based on the supply voltage so that it will always go off at the calibration point regardless of battery voltage.
I also added a calibration procedure that must be performed to record the proper setpoint. This ensures that the setpoint is accurate across small differences between different vehicles. In order to calibrate, you need to disconnect the gauge sensor in the engine bay (part# 83420-16040), turn the key to the on position, then hold the calibration button on the circuit board for a few seconds. A sound will confirm the calibration and you can reconnect the gauge coolant sensor in the engine bay.
