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 MANUALSJEEP1987CHEROKEE LIMITEDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEM4.0L MPI SYSTEMDIAGNOSIS & TESTINGCOMPONENT TESTINGMANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
1987 Jeep Cherokee Limited
Manifold Absolute Pressure (MAP) Sensor
1987 Jeep Cherokee LimitedSECTION Manifold Absolute Pressure (MAP) Sensor
NOTE:
Terminal identification letters are stamped on MAP sensor body.
- Disconnect electrical connector from sensor. With ignition on and engine stopped, measure voltage output of sensor terminal "B". See Fig 1 . Ensure wiring harness is okay by also measuring voltage at ECU terminal "C-t". Output voltage should be 4-6 volts at both points. Repair or replace wiring harness as required.
- With ignition on and engine stopped, measure supply voltage of sensor terminal "C". See Fig 1 . Ensure wiring harness is okay by also measuring voltage at ECU terminal "C-14". Supply voltage should be 4.4-5.5 volts at both points. Repair or replace wiring harness as required.
- Using an ohmmeter, measure ground circuit resistance at sensor terminal "A" and ECU connector terminal "D-3". Ensure wiring harness is okay by also measuring resistance between ECU terminal "D-3" and "B-11". If ohmmeter indicates an open circuit, check for defective sensor ground connection at right side of cylinder block.
- If ground connection is okay, replace ECU. If ECU terminal "D-3" has short to 12-volts, repair wire before replacing ECU. Repair or replace wiring harness as required.
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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.