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2gbaroinputworkaround [2012/07/05 13:25] twdorris |
2gbaroinputworkaround [2024/03/15 11:16] (current) |
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Short of removing that resistor from the ECU (described below), the 2G baro input is suitable for use only with very low impedance sensors (even a 50-ohm output impedance will produce a little over 1% of voltage offset). Since most sensor designs have a resistor in series with its output for protection, the 2G ECU's baro sensor input is probably not suitable for use with most sensors. | Short of removing that resistor from the ECU (described below), the 2G baro input is suitable for use only with very low impedance sensors (even a 50-ohm output impedance will produce a little over 1% of voltage offset). Since most sensor designs have a resistor in series with its output for protection, the 2G ECU's baro sensor input is probably not suitable for use with most sensors. | ||
- | **OMNIPOWER NOTE:** The [[http://www.ecmtuning.com/product_info.php?cPath=28_30&products_id=47|OmniPower 4-bar sensor]] that we sell on our website *does* work fine on the 2G baro input. This sensor incorporates a buffer circuit that drives the 2G baro input just fine. | + | **OMNIPOWER NOTE:** The [[https://www.ecmtuning.com/product_info.php?cPath=28_30&products_id=47|OmniPower 4-bar sensor]] that we sell on our website *does* work fine on the 2G baro input. This sensor incorporates a buffer circuit that drives the 2G baro input just fine. |
**GM MAF CABLE NOTE:** Also note that our GM MAF cable's "baro" [[gmmafiatbaro|breakout wire]] includes a buffer circuit as well. So any sensor connected to a GM MAF cable's "baro" wire will work fine as well without having to deal with the 2G ECU's baro input resistor configuration. | **GM MAF CABLE NOTE:** Also note that our GM MAF cable's "baro" [[gmmafiatbaro|breakout wire]] includes a buffer circuit as well. So any sensor connected to a GM MAF cable's "baro" wire will work fine as well without having to deal with the 2G ECU's baro input resistor configuration. | ||
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====== Process ====== | ====== Process ====== | ||
- | If you're really looking to maximize inputs, you can consider removing R39 from the underside of the ECU board. **NOTE:** This is ONLY appropriate for a 1995 EPROM ECU. It does not work on 96/97 ECUs. A different resistor may be present on 96/97 ECUs that can be removed like the 95 EPROM ECUs, but we have not spent any time yet trying to identify it. | + | 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. | 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}} | + | {{https://www.ecmtuning.com/images/forums/2gbaro.jpg}} |