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This is for reference. Source is Haynes manual.
The Festiva did not have industry standard OBD II (On Board Diagnostics) codes until 1996.
A. "On feedback carburetor systems, ground the one-pin terminal connector [white, in engine compartment between fender and brake booster] with a jumper wire to chassis ground. Also, connect the positive lead of an analog voltmeter to terminal 6 (green/red wire) of the 6-pin test connector under the dash [actually in engine compartment beside one-pin terminal above]. Connect the negative lead of the voltmeter to ground. Watch the sweeps of the voltmeter needle. The voltmeter must be analog to see the movement of the needle as it sweeps across the face of the meter."
b. "on EFI systems through 1995, connect a jumper wire from terminal STI [one-pin terminal] to GND [ground]. Also, connect a voltmeter from the STO terminal [need diagram here] and engine ground. With the ignition key ON (engine not running), watch the sweeps of the voltmeter needle. Note: it is also possible to read the trouble codes from the CHECK ENGINE light on the dash. Simply ground the STI and GND terminals with a jumper wire and watch the light on the dash as it flashes the stored codes(s)."
For both A and B above...
"...The light will blink the first digit(s) of the code at long intervals, and then blink the second digit at short intervals. For example, a code 34 will first blink three long flashes and then pause and blink four quick flashes. If the code is a one digit number it will flash at short intervals."
For "flashes" read also "sweeps of the voltmeter needle".
I've done this on my carburetted '89. The codes aren't erased until the battery is disconnected so if you miss the code the first time you can read it (or them) again as many times as you like. You can also take it into a shop and they can read the doces so long as you have not disconnected the battery.
The Festiva did not have industry standard OBD II (On Board Diagnostics) codes until 1996.
A. "On feedback carburetor systems, ground the one-pin terminal connector [white, in engine compartment between fender and brake booster] with a jumper wire to chassis ground. Also, connect the positive lead of an analog voltmeter to terminal 6 (green/red wire) of the 6-pin test connector under the dash [actually in engine compartment beside one-pin terminal above]. Connect the negative lead of the voltmeter to ground. Watch the sweeps of the voltmeter needle. The voltmeter must be analog to see the movement of the needle as it sweeps across the face of the meter."
b. "on EFI systems through 1995, connect a jumper wire from terminal STI [one-pin terminal] to GND [ground]. Also, connect a voltmeter from the STO terminal [need diagram here] and engine ground. With the ignition key ON (engine not running), watch the sweeps of the voltmeter needle. Note: it is also possible to read the trouble codes from the CHECK ENGINE light on the dash. Simply ground the STI and GND terminals with a jumper wire and watch the light on the dash as it flashes the stored codes(s)."
For both A and B above...
"...The light will blink the first digit(s) of the code at long intervals, and then blink the second digit at short intervals. For example, a code 34 will first blink three long flashes and then pause and blink four quick flashes. If the code is a one digit number it will flash at short intervals."
For "flashes" read also "sweeps of the voltmeter needle".
I've done this on my carburetted '89. The codes aren't erased until the battery is disconnected so if you miss the code the first time you can read it (or them) again as many times as you like. You can also take it into a shop and they can read the doces so long as you have not disconnected the battery.