Initial Discovery

[widde]

great find!

Got any specs on a interface? see if i can design one?

Edit: found it in the J2610 spec!
Easypeasy hw coms there, reading more now, only TTL and a strobed 20Vpp for programming:)

hmm, been reading more, the 20V strobe is multiplexed on the TX line, and one need to strobe it to get some data.

The Vpp flash strobe voltage is needed to
support the following four functions:
a. Initiating ECU boot-loader mode
b. Reading flash memory electronic signature (manufacturer and device codes)
c. Erasing flash memory
d. Programming flash memory

so a 12v to 20v dc/dc converter is needed that can manage 100mA.

so if one would build an own interface, i would go for a 5v Microcontroler with USB interface power that from the USB power, then connect a regular Serial bridge between some ports of the MCU and the car connector. Then build a DC/DC connector circuit, thats powered from the Car, taking 12v from the car. Then make a stobe circuit controlled from another port of the MCU. So it can be controlled over the USB (via serial adressing)

but if one only need a serial interface theres alot of options, here's one.
http://www.usbgear.com/computer_cable_d ... C601%2C461
and another http://www.pololu.com/catalog/product/391
but these wont solve the 20v programming need. Unless if one can in the serial comunication use th DTR/RTS bits to enable/disable an external circuit. Then it should be very cheap to build a pure SCI interface.

[GeoffAllan]

Actually, this is the one I like best:

http://www.easysync.co.uk/contents/en-uk/d20.html#p52

Directly into the CANbus at full speed... it can just sit and monitor all the current communication happening on the CAN-C bus, which is the high speed one. That means pretty much realtime datalogging of virtually everything related to engine operation.

[widde]

been reading abit, but i'm not sure about one thing...
...Does the CAN implementation in the CSRT4 system support programming or is that only done through the SCI interface?

Found anything about it?

[GeoffAllan]

been reading abit, but i'm not sure about one thing...
...Does the CAN implementation in the CSRT4 system support programming or is that only done through the SCI interface?

Found anything about it?

Still don't know.

To be honest, I've been enjoying driving the car so much I've kinda put things on hold for a few days

Probably will get to this on the weekend. I definitely want to establish some communication and see what's going on. For sure, I want to find a way to pull the flash first.

[GeoffAllan]

Fuel Injectors:

Stock Caliber SRT-4 fuel injectors flow 562cc of fuel @ 75 psi

Many injectors are still spec'd at 43.5 psi or 48 psi or 55 psi

For example, RC 550cc injectors are rated at 48 psi, at 75 psi they flow 687cc (factor 1.25)

[GeoffAllan]

Also, this ECM is called a GPEC1.

[GeoffAllan]

In case anyone's reading through this, much of this discussion is wrong.

The ECM can only be accessed through the CANbus, and uses the ASAM CCP 2.1 (CAN Calibration Protocol). I've started a new topic on this subject.

At this point, the only barrier is obtaining the security keys.