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--- ecuinputdata [2008/01/23 07:43]
76.100.119.159 created
+++ ecuinputdata [2014/09/10 12:18]
twdorris [ECU Input Impedance Mismatch]
@@ Line 1: / Line 1: @@
-====== Overview ======
+====== ECU Input Impedance Mismatch ======
-There are a number of analog inputs available on the 1G and 2G ECU.  Many are used for critical engine operation, but some are available for datalogging [[ExternalSensorList|aftermarket sensors]].  The problem is that some of these inputs are incompatible with some aftermarket sensors.  In particular, the 1G EGR temperature input and the 2G baro input have pull up/pull down resistor configurations that some sensors are not capable of driving properly.  The solution to this is to "buffer" the input so that the sensor is not directly driving the ECU's input.  The circuit and buffer board described below can be used for this purpose.  The picture below illustrates the buffer board available for purchase from ECMTuning.
-{{http://www.ecmtuning.com/images/forums/typicalinstall.gif}}
+There are a number of analog inputs available on the 1G and 2G ECU. Many are used for critical engine operation, but some are available for datalogging [[:externalsensorlist|aftermarket sensors]]. The problem is that some of these inputs are incompatible with some aftermarket sensors. In particular, the 1G EGR temperature input and the 2G baro input have pull up/pull down resistor configurations that some sensors are not capable of driving properly.
-**12/19/2007:** We are now accepting orders for these completed units.  We have several in stock, ready to ship.
-http://www.ecmtuning.com/ordering-buffer.html
+The solution to this is to "buffer" the input so that the sensor is not directly driving the ECU's input. The circuit and buffer board described below can be used for this purpose. The picture below illustrates the buffer board available for purchase from ECMTuning.
-====== Details ======
+{{http://www.ecmtuning.com/images/forums/typicalinstall.gif?direct&}}
+**01/01/2013:**Due to low demand, we've decided to discontinue this product.  Many common sensors now include this type of functionality internally, negating the need for this board.  The Omni 4-bar sensor that we sell on our website, for example, has this functionality built in.  Most, if not all, wideband kits these days do too.
+====== Connections ======
+Connect "+5V from ECU" to the ECU's +5V sensor power, pin 23 (Green/Red) on a 1G ECU or pin 81 (Green/Yellow) on a 2G ECU.  This is also present under the hood at the MAF, TPS and MDP sensors.
+Connect "GND to ECU" to the ECU's sensor ground, pin 24 (Green/Black) on a 1G ECU or pin 92 (Black) on a 2G ECU.  This is also present under the hood at the MAF, TPS, MDP and coolant temp sensors.
+If the sensor is a 5V sensor that draws little current, like a MAP sensor, connect the sensor's power, signal and ground connections to the input side of the buffer circuit assembly. If the sensing device, such as a wideband, has its own power and ground, connect only the sensing device's signal wire to the input side of the buffer. In either case, you still must provide +5V and GND to the buffer circuit and you must then insulate any unused wires.
+====== DIY Details ======
 The following table lists a set of ECU inputs and their internal pull up/pull down resistor configuration.
 ^ Input ^ 1G ^ 2G ^
-| ""EGRTemp"" | 10k up | - |
+| EGRTemp | 10k up | - |
 | Baro | float/100k down? | 3.3k down |
-| IAT | 2.2k up / 39k down? | 2.2k up / 39k down? |
+| IAT | 2.2k up / 39k down | 2.2k up / 39k down |
-| Coolant | 2.2k up / 39k down? | 2.2k up / 39k down? |
+| Coolant | 2.2k up / 39k down | 2.2k up / 39k down |
 | MDP | - | 100k down |
+| Rear O2 | - | 220k down |
 Again, the EGRTemp on a 1G and the Baro input on a 2G are problematic for some aftermarket sensors.  When feeding certain wideband kits into the EGRTemp input on a 1G, for example, you may see normal A/F ratio readings above 11.5:1 but then the readings flatline there and won't show any value below that.

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