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Select monitor and `90s SUBARU cars page For those who love 90's SUBARU cars |
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| Select Monitor(WRX) | Select Monitor(SVX) | Cruise Control |
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Reproducing the functions of the SUBARU Select Monitor on a Windows PC When my car has a problem and I take it to the dealer, the mechanic connects a machine and checks it. That's the Subaru Select Monitor. This device has been updated several over the years, and it seems that the type called SSM2 was compatible with Subaru vehicles until about 1998, before OBD II became available. As the car gets older, parts here and there start to wear out. Until the 1980s, cars had carburettors, which can be maintained only by mechanical disassembly, but since they changed to electronic fuel injection using a microprocessor, the car becomes useless when the ECU or sensors deteriorate or become damaged even if the mechanical parts in working order. In Japan now, it is no longer possible to pass the vehicle inspection if a warning indicator such as a check engine light. |
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| This is a big problem for the '90s cars. You usually need diagnostic equipment such as a select monitor since sensor degradation cannot be seen just by looking at it. It is difficult for users to obtain this because it is not sold to the general public though SUBARU dealers and only auto repair shops can buy it. However, there seems to be someone in the UK who analysed this select monitor. Please refer to "Diagnostics and Datalogging for Subaru SVX" website with click here. My software was basically designed from the information in there. Many thanks to Phil Skuse for the information. There was no information about Impreza WRX on his page. Then, I created a ROM analize tool and checked where various parameters were located. There was a M37700 bdisassambler before, but this tool can be analyzed a little more detail. I will explain this tool in another page later. In 2023, the Subaru dealer mainly uses SSM3 and SSM4, which are ODB II. The support of SSM and SSM2 for 90's cars seem to have expired, and they are not used now, and these old cars which has no ODB II ports may become impossible to diagnose in near future. |
Currently, I am working to support the GC8/GF8 Impreza first and medium generation models (~ `98/September). I think it will probably be possible to support SF5 Forester. Since the first model has several differnet information, the beta version displays double information. As soon as I found which parameter is correct, I will delete wrong one. What "Select Monitor for Windows (Impreza WRX edition)" can do are as follows 
 
Note1:The communication speed of the serial interface is slow at about 2000bps. Only a few parameters can be read out per second. Specifying many parameters slows down the display update. Note2:It takes several hours to read the ROM data. If you try to read it without starting the engine, the battery will definitely go flat. Take sufficient precautions, such as charging the battery with a charger. Example 1：Warm up  As the water temperature rises, the ISC valve gradually closes and the idling speed slow down. Finally, it seems to settle down to about 800 rpm at about 70 degree. Example 2 : Knock correction  It seems that the ignition timing is gradually advanced by knock correction when the throttle is not opened. Knocking detection returns the correction at once, and it seems that the correction is gradually applied again. Example 3 : Air/Fuel ratio correction  When the voltage of the O2 sensor is low (lean), the A/F correction value increase, and when the voltage is high (rich), the correction value decrease. Example 4 : Boost control solenoid  When the throttle is released, the boost pressure solenoid operates momentarily, and the negative pressure seems to open the turbine wastegate. Example 5 : Coolant temperture  When the road is congested (when starting and stopping repeatedly), the water temperature gradually rises. It seems to be less than about 90 degrees Celsius when running normally. The water temperature drops as soon as you run. |
Download and install Download the zip file from the link below and extract it to any folder on your PC. I am not using the registry. Configuration values are saved in the "select_monitor.ini" file in the application installation folder. The .ini file cannot be customized for other SUBARU cars.(Support for other car models may be available upon request.) 
SUBARU Select Monitor for Windows (Impreza WRX edition) Build 240224 Right click to download  Change ini file folder.Build 240212 Right click to download Installer available.Build 230318 Right click to download Build 230307 (Beta) Right click to download If you download the ROM data (bin) of the ECU from the link below, you can display the fuel and ignition timing map. It's safer than actually reading from the car. Put the downloaded file in the same folder as the software. You will be able to select it in the combobox of MAP tab. Link to ECU Rom Images (http://www.alcyone.org.uk/ssm/ecuroms.html) (A separate window will open.) Current supported ECU/TCU ROM ID and Correspondence in the future The currently supported Impreza ECU ROM IDs are as follows. If the ROM ID is not registered, you can use only MAP displaying with pre-downloaded ROM data and reading of ROM data function. If you send me your ROM ID with your vheicle information and whole ROM data, I will register your ROM ID.
The currently supported Impreza TCU ROM IDs are as follows. If the ROM ID is not registered, you can use only reading of ROM data function. If you send me your ROM ID with your vheicle information and whole ROM data, I will register your ROM ID.
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Please contact the same email address for bug reports and improvement requests.