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 PERFORMANCETESTING & DIAGNOSISFUEL INJECTION SYSTEM - MULTI-POINTTESTINGSYSTEM TESTINGMAP SENSOR TEST
1987 Jeep Cherokee Limited
MAP Sensor Test
1987 Jeep Cherokee LimitedSECTION MAP Sensor Test
- Inspect the MAP sensor hoses and connections. Repair as necessary. With the ignition on and the engine off, test the MAP sensor output voltage at the MAP sensor connector terminal "B" (marked on sensor body). See Fig 1 . The output voltage should be 4 to 5 volts.
- To verify the wiring harness condition, test ECU terminal C-6 for the same voltage described. Test MAP sensor supply voltage at the sensor connector terminal "C" with the ignition on.
- The voltage should be 4.5-5.5 volts. The same voltage should also be at terminal C-14 of the ECU wire harness connector. Using a Diagnostic Tester (M.S. 1170), test MAP sensor ground circuit at terminal D-3 and terminal "A" of sensor connector.
- Using an ohmmeter, test the MAP sensor ground circuit at the ECU connector between terminal D-3 of ECU connector and terminal B-11 with an ohmmeter.
- If the ohmmeter or diagnostic tester indicates an open circuit, inspect for a defective sensor ground connection, located on the right side of the cylinder block. If the ground connection is good the ECU may need to be replaced.
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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.