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 DIAGNOSISSPECIFICATIONSELECTRICAL SPECIFICATIONSCOMPUTERS AND CONTROL SYSTEMS
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFI
Computers and Control Systems
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFISECTION Computers and Control Systems
COOLANT TEMPERATURE SENSOR
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
MANIFOLD AIR/FUEL TEMPERATURE (MAT) SENSOR
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
ENGINE SPEED SENSOR (CPS) 200 +/- 75 ohms
OXYGEN SENSOR (O2) HEATING ELEMENT 5 - 7 ohms
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
MANIFOLD AIR/FUEL TEMPERATURE (MAT) SENSOR
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
ENGINE SPEED SENSOR (CPS) 200 +/- 75 ohms
OXYGEN SENSOR (O2) HEATING ELEMENT 5 - 7 ohms
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
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.