Above the gas pedal, under the dash, there is 2 wires with clips that you plug together. Check engine light will flash the codes recorded in the ecu.
see www.12volt.com
http://ae64.com/Legacy-pinout.htm
If you're having problems with your cruise control, I would suggest that you check into your Subaru's transmission and engine error codes to see what it's returning if anything. Many times the problem with the cruise can be diagnosed by the vehicle itself. The car will not allow the cruise control to function if it knows about a specific problem, which will be given in the error codes. I don't know what year subaru you have, but look into getting both the engine (check engine light) error codes and the transmission (power light) error codes on your Legacy to see what they're returning. My speed sensor was out on my Subaru. Once I found the problem in the error codes, I swapped it out and my cruise worked just great.
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You read the trouble codes on the dsahboard "engine check" light. To get the codes out you connect two black, single wire connectors under the dash near the steering column while the ignition is turned off, then turn the key on and the light should flash a code. More information can be found at... http://www.troublecodes.net/Subaru/ .
You will need an OBDII scanner to retrieve the codes. WalMart has some for about $70 if you want to buy one. Otherwise, you can go to AutoZone and have it scanned free.
To reset the check engine light on a 1994 Subaru Legacy, you can disconnect the negative terminal of the battery for about 15 minutes to clear the engine control unit (ECU) memory. Alternatively, you can use an OBD-I scanner to check for codes and clear them. After either method, reconnect the battery or scanner, and start the vehicle to see if the light remains off. Ensure any underlying issues are resolved before resetting the light, as it will likely return if problems persist.
You will need an OBDII scanner to retrieve the codes. WalMart has some for about $70 if you want to buy one. Otherwise, you can go to AutoZone and have it scanned free.
It means that there is a problem with your emissions control system, have the codes read. Most big chain parts stores will do it for free and you can figure out what needs attention from there.
You need an OBDII scanner to retrieve the codes.
All 1995 and later model vehicles require an OBDII scanner tool to retrieve the trouble codes.
You will need a engine scaner. But you can go to a Advance auto parts store and they will scan the engine for free. NEUTZ