2gbaroinputworkaround
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
|
2gbaroinputworkaround [2012/07/02 08:57] twdorris |
2gbaroinputworkaround [2012/07/05 13:25] twdorris |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| ====== 2G Baro Input Workaround ====== | ====== 2G Baro Input Workaround ====== | ||
| - | The baro input of the 2G ECU may not be compatible with aftermarket sensors. The 2G ECU has a 3.3K ohm pull-down resistor (R39 on 1995 EPROM ECUs), which may (probably will) put more load on the sensor than it can drive properly. | + | The baro input of the 2G ECU may not be compatible with aftermarket sensors. The 2G ECU has a 3.3K ohm pull-down resistor (R39), which may (probably will) put more load on the sensor than it can drive properly. |
| For example, a GM 3-bar sensor can only drive this input to 1.76 volts at maximum pressure. The GM 3.3-bar sensor seems to have a bit lower output impedance and will drive the 2G baro input a little higher, but it's still unsuitable. | For example, a GM 3-bar sensor can only drive this input to 1.76 volts at maximum pressure. The GM 3.3-bar sensor seems to have a bit lower output impedance and will drive the 2G baro input a little higher, but it's still unsuitable. | ||
| Line 14: | Line 14: | ||
| **12/19/2007:** Instead of this process, you can also consider using the [[ECUInputData|buffer circuit]]. | **12/19/2007:** Instead of this process, you can also consider using the [[ECUInputData|buffer circuit]]. | ||
| + | |||
| ====== Process ====== | ====== Process ====== | ||
| - | If you're really looking to maximize inputs, you can consider removing R39 from the underside of the ECU board. Best to use a couple small-tip soldering irons for this. Heat 'em up, apply one to each side of the resistor and slide it right off. I'm including a picture of the location of the resistor of interest below. I have verified that this does allow a GM 3bar to drive the baro input just fine. Once you have done that, you can use either the baro or the intake air temp inputs for whatever you want. | + | If you're really looking to maximize inputs, you can consider removing R39 from the underside of the ECU board. |
| + | |||
| + | It's best to use a couple small-tip soldering irons for this. Heat 'em up, apply one to each side of the resistor and slide it right off. I'm including a picture of the location of the resistor of interest below. I have verified that this does allow a GM 3bar to drive the baro input just fine. Once you have done that, you can use either the baro or the intake air temp inputs for whatever you want. | ||
| {{http://www.dsmlink.com/images/forums/2gbaro.jpg}} | {{http://www.dsmlink.com/images/forums/2gbaro.jpg}} | ||
2gbaroinputworkaround.txt · Last modified: 2024/03/15 11:16 (external edit)
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Share Alike 4.0 International
