I dont know how to pull the codes on a 1993 volvo 940
Volvo Code Retrieval
Accessing Trouble Codes
89-93 models (and later non-turbo/non-OBDII
models)
Fuel Codes
Locate the diagnostic unit behind left strut tower and remove its
cover.(see image) Connect selector cable to socket #2,which tests
the fuel codes. Turn the ignition switch to the ON position(engine
not running). Enter the diagnostic mode by pressing the push button
on the diagnostic unit for at least 1 second, but not more than
3 seconds. The red LED light will start to flash,count the number
of flashes in 3 flash intervals. The flashes will be seperated by
3 second intervals.Make note of all codes. If no codes are stored,the
LED will flash 1-1-1,which means the fuel system is operating correctly.
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Ignition Codes
To access the ignition codes,follow the above procedure,but with
the selector cable connected to the #6 socket on the diagnostic
unit.
NOTE:Turbocharged models may have seperate codes for the
turbo system and are accessse by hooking the selector cable to the
#5 socket.
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