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.
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HOMESERVICE MANUALSJEEP1991CHEROKEE 2WD L4-150 2.5L VIN P MFIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)TESTING AND INSPECTION
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFI
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFISECTION Testing and Inspection
Coolant Temperature Sensor:
CAUTION: A high input impedance digital volt-ohm meter (DVOM) is required when testing sensors on these vehicles. A low input impedance meter could seriously damage certain components of this system.
Disconnect the coolant temperature sensor electrical connector, and check the resistance across its two terminals. The resistance should be less than 1,000 ohms when the engine is at normal operating temperature. See the following resistance chart to verify that the coolant temperature sensor is within its range.
Temperature-to-Resistance Values
(Approximate)
~F ~C Ohms
212 100 185
160 70 450
100 38 1,600
70 20 3,400
40 4 7,500
20 -7 13,500
0 -18 25,000
-40 -40 100,700
RENDER: 1.0x
NO RELATED
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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.