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.
1997 Geo Metro BaseFACTORY OEM SERVICE PROCEDURE
Engine Controls - Sensor Operating Range Charts: Introduction: Notes
Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a trouble code, but it may cause driveability problems.
NOTE:
Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
CAMSHAFT POSITION (CMP) SENSOR RESISTANCE
| Temperature | Ohms |
|---|---|
| 14-122°F (-10-50°C) | 185-275 |
| 122-212°F (50-100°C) | 240-325 |
CRANKSHAFT POSITION (CKP) SENSOR
| Temperature | Ohms |
|---|---|
| 68°F (20°C) | 360-460 |
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE
| Temperature °F (°C) | Ohms |
|---|---|
| 0 (-18) | 14,650 |
| 19 (-7) | 8100 |
| 39 (4) | 4780 |
| 70 (21) | 2350 |
| 100 (38) | 1250 |
| 160 (71) | 400 |
| 210 (99) | 190 |
FUEL INJECTOR RESISTANCE
| Application | Ohms |
|---|---|
| Metro & Firefly (Canadian) | 0.5-1.5 |
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE
| Temperature °F (°C) | Ohms |
|---|---|
| 0 (-18) | 14,800 |
| 19 (-7) | 8250 |
| 39 (4) | 5200 |
| 70 (21) | 2500 |
| 100 (38) | 1300 |
| 160 (71) | 450 |
| 210 (99) | 200 |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.