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.
1998 Chevrolet Metro BaseFACTORY OEM SERVICE PROCEDURE
Scan Tool Data
NOTE:
Information contained in the following tables is typical of readings taken on a vehicle with engine idling at normal operating temperature, throttle closed, transmission in Park or Neutral, system in closed loop status, and all accessories off (except as noted in tables). For additional information, see scan tool owner's manual.
SCAN TOOL DATA VALUES
| Scan Tool Parameters (1) | Typical Data Value | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air Conditioning | Off | ||||||||||||||||||
| BARO | (2) 12.9-14.4 psi (89-99 kPa) | ||||||||||||||||||
| Battery Voltage | 12-14 Volts | ||||||||||||||||||
| Closed Throttle Switch | Idle | ||||||||||||||||||
| Desired Idle Speed | 850 RPM | ||||||||||||||||||
| ECT | 176-194°F (80-90°C) | ||||||||||||||||||
| EGR Solenoid Vacuum Valve | Off | ||||||||||||||||||
| EGR By-Pass Solenoid | Off | ||||||||||||||||||
| Electrical Load Signal | (3) No | ||||||||||||||||||
| Engine Coolant Fan | (4) | ||||||||||||||||||
| Engine Speed | 750-950 | ||||||||||||||||||
| Engine Load | 3-5% | ||||||||||||||||||
| EVAP Duty Cycle | 0-100% | ||||||||||||||||||
| EVAP Density Trim | 0-14 Counts (Varies) | ||||||||||||||||||
| EVAP Vent Solenoid | (5) Off | ||||||||||||||||||
| Fuel Cutoff Signal | Off | ||||||||||||||||||
| Fuel Injector PWM | 0.8-2.3 mS | ||||||||||||||||||
| Fuel Level | (6) Varies | ||||||||||||||||||
| Fuel Pump | On | ||||||||||||||||||
| Fuel Tank Pressure Control Solenoid | Varies | ||||||||||||||||||
| Fuel Tank Pressure | (7) 0.0 mmHg | ||||||||||||||||||
| Fuel Trim (Long Term) | (8) -20%-+20% | ||||||||||||||||||
| Fuel Trim (Short Term) | (8) -20%-+20% | ||||||||||||||||||
| HO2S-1 | (9) 50-950 mV | ||||||||||||||||||
| HO2S-2 | (9) 50-950 mV | ||||||||||||||||||
| HO2S-1 Ready | Yes | ||||||||||||||||||
| HO2S-2 Ready | Varies | ||||||||||||||||||
| IAT | 68-95°F (20-35°C) | ||||||||||||||||||
| ISC Duty Cycle | 25-40% | ||||||||||||||||||
| Loop Status | Closed | ||||||||||||||||||
| MAP (Pressure) | 4.2-6.8 psi (29-47 kPa) | ||||||||||||||||||
| MAP (Voltage) | (2) 1.32-1.90 volts | ||||||||||||||||||
| Spark Advance Adjust Test Switch | Off | ||||||||||||||||||
| Spark | -1°-18° | ||||||||||||||||||
| Starter Switch | Released | ||||||||||||||||||
| Total Fuel Trim | (9) -35%-+35% | ||||||||||||||||||
| TP Angle | 7-18% | ||||||||||||||||||
| TP Sensor | 0.42-1.15 Volts | ||||||||||||||||||
| Vehicle Speed | Zero MPH (Zero km/h) | ||||||||||||||||||
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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.