Re: V2.00 board errata
Posted: Sun Nov 09, 2008 10:25 am
All,
I found a problem in the build instructions and BOM for those targeting the 4L60E. You need to add 330 Ohm pull-up resistors in R22, R84, and R85. This isn't done if you are using a pot style manual gear lever sensor (ex. Ford), but it needs to be done for digital style inputs (like the 4L60E has). The change comes about because the pins were switched from digital inputs with internal pull-ups to analog-digital converters (with no internal pull-up - so an external pull-up is needed).
I have fixed the build guide and BOM. I will add a couple of more small changes in a few minutes, so watch this thread.
----> additions below <------
FOR ALL APPLICATIONS: Pull-ups should be added to the shift buttons as well. For the Upshift button on PT6/VR2, the circuit needs to be reconfigured a bit:
- remove R60 and jumper it with a snipped off lead,
- install a 1.0K Ohm resistor in R38,
- remove the jumper on C31,
- install a 330 Ohm resistor from the end of R48 nearest the heat sink, to the hole for C31 nearest the Ampseal connector.
For th Downshift button, install a 330 Ohm resistor in R25 (no other changes needed).
------> more additions <-----
ALL APLICATIONS: R27 (GPI2/4WD), R29 (GPI2/swB), R67 (EGT3/swC), and R70 (EGT4/swA) should not be installed, they should be jumpered instead. These are on digital inputs for ciurcuits that ground to pull low. The resistor in-line could affect the inputs at the processsor ports in some conditions, so they are best left out (EGT3 should be configured using the manual - http://www.megamanual.com/gpio/egt.htm - if it is not used for manual gear lever detertmination).
----> more <----
ALL APPLICATIONS: Install jumpers made from snipped off leads on R9, R10, R11, R12 (on the PWMx circuits) otherwise they won't be connected to ground.
I will add these to the manual as well.
Lance.
I found a problem in the build instructions and BOM for those targeting the 4L60E. You need to add 330 Ohm pull-up resistors in R22, R84, and R85. This isn't done if you are using a pot style manual gear lever sensor (ex. Ford), but it needs to be done for digital style inputs (like the 4L60E has). The change comes about because the pins were switched from digital inputs with internal pull-ups to analog-digital converters (with no internal pull-up - so an external pull-up is needed).
I have fixed the build guide and BOM. I will add a couple of more small changes in a few minutes, so watch this thread.
----> additions below <------
FOR ALL APPLICATIONS: Pull-ups should be added to the shift buttons as well. For the Upshift button on PT6/VR2, the circuit needs to be reconfigured a bit:
- remove R60 and jumper it with a snipped off lead,
- install a 1.0K Ohm resistor in R38,
- remove the jumper on C31,
- install a 330 Ohm resistor from the end of R48 nearest the heat sink, to the hole for C31 nearest the Ampseal connector.
For th Downshift button, install a 330 Ohm resistor in R25 (no other changes needed).
------> more additions <-----
ALL APLICATIONS: R27 (GPI2/4WD), R29 (GPI2/swB), R67 (EGT3/swC), and R70 (EGT4/swA) should not be installed, they should be jumpered instead. These are on digital inputs for ciurcuits that ground to pull low. The resistor in-line could affect the inputs at the processsor ports in some conditions, so they are best left out (EGT3 should be configured using the manual - http://www.megamanual.com/gpio/egt.htm - if it is not used for manual gear lever detertmination).
----> more <----
ALL APPLICATIONS: Install jumpers made from snipped off leads on R9, R10, R11, R12 (on the PWMx circuits) otherwise they won't be connected to ground.
I will add these to the manual as well.
Lance.