The code data below comes from a CRX manual (thanks Henry...) but the computer and associated codes are MAINLY the same. Beware potential for incorrect data.
To get the code you need to run the engine and then check the lights BEFORE turning off the ignition. I understand the computer is under the seat in the City (on the firewall in our Civic!)
Code 0: PGM-F1 lit (no other lights up) Control unit failure, short circuit in combination meter. Engine won't start.
Code 1: Shorted or faulty O2 sensor
Code 3: (lights 2 & 1 lit) MAP sensor - disconnected or open / shorted MAP sensor wiring. Poor pick up, engine tends to stall.
Code 5: (lights 4 & 1 lit) Disconnected MAP sensor vacuum line
Code 6: (lights 4 & 2 lit) TW sensor faulty / disconnected / open circuit - Difficult to start when cold
Code 7: (lights 4, 2 & 1 lit) - Throttle sensor - disconnected / open circuit (or incorrectly set when throttle is shut we found when we rebuilt throttle body! Output needs to be 0.48 - 0.52V - you need a high impedance DVM to measure) Poor pick up if not correct.
Code 8: (light 8 lit) TDC sensor - open / shorted wiring or disconnected - irregular idle speed, poor pick up
Code 9: (lights 8 & 1 lit) CYL sensor
PGM-F1 lit and Code 10: (lights 8 & 2) TA sensor - irregular idle when cold
PGM F1 and Code 11: (lights 8, 2 & 1 lit) - IMA sensor (influences mixture richness)
PGM-F1 & Code 13: - in CRX is the PA sensor. I don't believe the City has one - maybe MAP2?
HyperBlade EDIT: Thanks to Bigelboe for translating, original post found here. viewtopic.php?t=2103
Code 3: is map sensor A faulty wiring
Code 4: is map sensor B faulty wiring
Code 5: is faulty plumbing for either map sensor
Code 8: is faulty cam angle sensor
Code 9: is the same as 8
Codes 12 to 16: are all ECU problems
These are all translated from page 11-18 in the city turbo manual.