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
1999 Chrysler Cirrus L4-2.4L VIN XSECTION Testing and Inspection
To perform a complete test of this sensor and its circuitry, refer to DRB scan tool and appropriate Powertrain Diagnostics Procedures. To test the sensor only, refer to the following:
1. With the key off, disconnect wire harness connector from coolant temperature sensor.
2. Connect one lead of a high input impedance (digital) volt-ohmmeter to one terminal of sensor.
3. Connect the other ohmmeter lead to remaining terminal of sensor. The ohmmeter should read as follows:
- Engine/Sensor at normal operating temperature around 200°F should read approximately 700 to 1,000 ohms.
- Engine/Sensor at room temperature around 70°F ohmmeter should read approximately 7,000 to 13,000 ohms.
4. Test the resistance of the wire harness between the PCM connector terminal 26 and the sensor harness connector. Also check for continuity between connector terminal 43 and the sensor harness connector. If the resistance is greater than 1 ohm, repair the wire harness as necessary.
1. With the key off, disconnect wire harness connector from coolant temperature sensor.
2. Connect one lead of a high input impedance (digital) volt-ohmmeter to one terminal of sensor.
3. Connect the other ohmmeter lead to remaining terminal of sensor. The ohmmeter should read as follows:
- Engine/Sensor at normal operating temperature around 200°F should read approximately 700 to 1,000 ohms.
- Engine/Sensor at room temperature around 70°F ohmmeter should read approximately 7,000 to 13,000 ohms.
4. Test the resistance of the wire harness between the PCM connector terminal 26 and the sensor harness connector. Also check for continuity between connector terminal 43 and the sensor harness connector. If the resistance is greater than 1 ohm, repair the wire harness as necessary.
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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.