Hi,
If you are after more than finding trouble codes (I am aware about 101 of those for OBD-I) then you might be interested in the following tool I am selling:
viewtopic.php?t=87987&highlight=
You'll be able to see on PC and record graphs of the following:
- Injection time (ms)
- Ignition timing angle (deg)
- IAC Valve (% from 255)
- Engine speed (rpm)
- MAP (kPa)
- Coolant Temperature(deg.C)
- Throttle/Pedal position (deg)
- Vehicle speed (km/h)
- Target Air/Fuel (left/right) (%)
- Enrichment after engine start (on/off)
- Warming enrichment (on/off)
- Knock sensor (detonation) (on/off)
- Starter (on/off)
- Idle switch (opened/closed)
- A/C (on/off)
- Park/Neutral switch (on/off)
- O2 sensor (Lean/Rich)