Differences

This shows you the differences between two versions of the page.

--- ecuinputdata [2024/03/15 11:16]
127.0.0.1 external edit
+++ ecuinputdata [2026/02/17 12:14] (current)
dmertz [DIY Details]
@@ Line 29: / Line 29: @@
 ====== 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 | - |
-| Baro | float/100k down? | 3.3k down |
-| IAT | 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.
+^Input ^1G ^2G |
+|EGRTemp |2.2k up / 39k down |- |
+|Baro |float/100k down? |3.3k down |
+|IAT |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.
+For 2Gs, feeding an aftermarket pressure sensor into the Baro input can produce a cap on the upper value read by the sensor. A 3.3-bar sensor, for example, might flatline at 2.5-bar. For the 2G Baro issue, there's a fairly simple solution if you're handy with a soldering iron (or two). The [[:2gbaroinputworkaround|2G baro input workaround]] page describes this solution.
+In either case (1G or 2G) and for just about any input, you can also consider using a unity buffer to drive the ECU. Such a device presents a low-load input for connecting the external sensor and then produces a higher drive output for connecting to the ECU's input. The following schematic can be used to build this device.
+{{https://www.ecmtuning.com/images/forums/Buffer.JPG?direct&}}
+Note that this is not necessarily an easy thing to do. The op-amp part referenced in that diagram is extremely small and difficult to work with if you're not familiar with SMT techniques or have access to appropriate equipment.
-For 2Gs, feeding an aftermarket pressure sensor into the Baro input can produce a cap on the upper value read by the sensor.  A 3.3-bar sensor, for example, might flatline at 2.5-bar.  For the 2G Baro issue, there's a fairly simple solution if you're handy with a soldering iron (or two).  The [[2gBaroInputWorkaround|2G baro input workaround]] page describes this solution.
-In either case (1G or 2G) and for just about any input, you can also consider using a unity buffer to drive the ECU.  Such a device presents a low-load input for connecting the external sensor and then produces a higher drive output for connecting to the ECU's input.  The following schematic can be used to build this device.
+If you can't wait and working with a SOT23-5 package is just too small for you, then consider this circuit/chip instead. It's a bit easier to work with.
-{{https://www.ecmtuning.com/images/forums/Buffer.JPG|Diagram}}
-Note that this is not necessarily an easy thing to do.  The op-amp part referenced in that diagram is extremely small and difficult to work with if you're not familiar with SMT techniques or have access to appropriate equipment.
+{{https://www.ecmtuning.com/images/forums/BufferDIP.JPG?direct&}}
-If you can't wait and working with a SOT23-5 package is just too small for you, then consider this circuit/chip instead.  It's a bit easier to work with.
-{{https://www.ecmtuning.com/images/forums/BufferDIP.JPG|Diagram}}
+\\

ECMTuning - wiki

User Tools

Site Tools

Differences

Page Tools