Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1994 Geo Metro Base, 4D Hatchback, StandardFACTORY OEM SERVICE PROCEDURE
Scan Tester Data
NOTE:
Information contained in the following table is typical of readings taken on vehicle with engine idling, upper radiator hose hot, throttle closed, transmission in Park or Neutral, closed loop status achieved and all accessories off (except as noted in tables). Not all devices and systems are used on all models. For additional information, see tester owner's manual.
TYPICAL DATA VALUES
| Tester Position | Units Measured | Nominal Value | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A/C Switch | On/Off | Off | ||||||||||
| BARO (1) | Volts/kPa | 3.68 (100) | ||||||||||
| Desired Idle | RPM | ECM Controls (Varies) | ||||||||||
| EGR Solenoid | On/Off | Off | ||||||||||
| Electrical Load | On/Off | (2) Off | ||||||||||
| Eng. Coolant Temp. | °F (°C) | 176-201 (80-94) | ||||||||||
| Engine Speed | RPM | 800-900 | ||||||||||
| Fuel EVAP Purge (1) | On/Off | Off | ||||||||||
| IAC/ISC Duty (1) | % | 10-50 | ||||||||||
| Idle Switch | On/Off | On | ||||||||||
| Injector Pulse Width | Mil/Sec | 1.0-1.7 | ||||||||||
| Intake Air Temp. | °F (°C) | (3) 68-95 (20-35) | ||||||||||
| ISC Duty (4) | % | 10-50 | ||||||||||
| L.T. Fuel Trim | Counts | 119-131 | ||||||||||
| MAP | Volts/kPa | 1.32-1.90 (34-42) | ||||||||||
| MPH | MPH | 0 | ||||||||||
| O2 (5) | Millivolts | 10-900 | ||||||||||
| O2 Activation | Act/Deact | Activate | ||||||||||
| Park/Neutral Pos | P/N/RDL | P/N (A/T) | ||||||||||
| Park/Neutral Pos | P/N/RDL | RDL (M/T) | ||||||||||
| Power Steering Sw | On/Off | Off | ||||||||||
| Power Steer VSV (4) | On/Off | Off | ||||||||||
| Rich/Lean Stat | Rich/Lean | Switches | ||||||||||
| Spark Advance | ° | 20-28 | ||||||||||
| S.T. Fuel Trim | Counts | 113-143 | ||||||||||
| System Voltage | Volts | 14.0-14.5 | ||||||||||
| Throttle Angle | ° | 0 | ||||||||||
| Throttle Position | Volts | .45-.65 | ||||||||||
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.