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.
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
1992 Saab 900 L4-2118cc 2.1L DOHCSECTION Testing and Inspection
1. Disconnect electrical connector and remove cover from ECU assembly.
2. Connect a suitable ohmmeter on to ECU terminals 13 and ground.
3. With engine coolant temperature at approximately 68°F, ohmmeter reading obtained should be 2600 ohms. With engine coolant temperature at approximately 212°F, ohmmeter reading obtained should be 180 ohms.
4. If readings obtained are not as specified, disconnect electrical connectors from temperature transmitter. Connect ohmmeter across temperature transmitter terminals and check resistance.
5. If resistance readings obtained are still incorrect, replace temperature transmitter.
2. Connect a suitable ohmmeter on to ECU terminals 13 and ground.
3. With engine coolant temperature at approximately 68°F, ohmmeter reading obtained should be 2600 ohms. With engine coolant temperature at approximately 212°F, ohmmeter reading obtained should be 180 ohms.
4. If readings obtained are not as specified, disconnect electrical connectors from temperature transmitter. Connect ohmmeter across temperature transmitter terminals and check resistance.
5. If resistance readings obtained are still incorrect, replace temperature transmitter.
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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.