Select Monitor Adapter
Subaru Diagnostic Ports
How to build a PC adapter
Engine Control Unit (ECU)
Reading Error Codes
Transmission Control Unit (TCU)
Reading Error Codes
Other Control Units
Air Conditioning Unit 4WS Control Unit Cruise Control Unit
Select Monitor Cartridge
Links to other sites
Custom TCU Development
Subaru Select Monitor Eavesdrop Cable
This cable will allow a Select Monitor and a PC to be connected to the car at the same time. The PC will be able to eavesdrop on the conversation between the car and the Select Monitor. This makes it possible to compile a definitive list of the ECU parameters that can be used in VWRX, Evoscan and any other data logging software.
To build the cable, you need 1 male connector (1st Gen Legacy Radio Harness) and 3 female connectors (B35 yellow select monitor connectors).
At one end of the cable is the male Legacy radio harness connector. This connects to the female Select Monitor connector on the car. At the other end of the cable are three female Select Monitor Connectors.
The centre connector is where you plug in the SSM. It's cables go straight through the to male plug. 2-2, 3-3, 5-5 and 9-9. In the description below, "wire 2" and "wire 3" refer to the wires on pins 2 and 3 of this connector.
The left connector is also wired straight through, but pin 3 (transmit) is not connected because this connector only receives data from the car, it does not transmit. You will notice that pin 2 (receive) is connected to wire 2 (transmit from Car to SSM). Data travelling along wire 2 from the Car to the SSM will be received by a PC attached to this connector.
The right connector also has no transmit wire. In addition, its pin 2 (receive) is connected to wire 3 (transmit from SSM to Car). Data travelling along wire 3 from the SSM to the Car will be received by a PC attached to this connector.
You do not need to have two PCs to perform the monitoring, you can have just one PC and move it between the left and right connectors.
How to use get the parameter addresses
How to find the conversion formulas
A. Scalar quantities
B. On-Off Switches