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.
1990 Eagle Premier ESFACTORY OEM SERVICE PROCEDURE
Manifold Absolute Pressure (Map) Sensor Test
- Ensure MAP sensor vacuum hose connections are secure. The MAP sensor is located in engine compartment on firewall. Backprobe MAP sensor connector. Connect a voltmeter between MAP sensor terminal "B" (marked on sensor connector) and ground. Turn ignition on.
- Voltmeter should read 4-5 volts. Start engine and warm to operating temperature. Voltmeter should now read 1.5-2.1 volts. Check ECU terminal "C6" for same voltmeter readings as measured at MAP sensor terminal "B," to check wiring harness between ECU and MAP sensor. Repair as necessary.
- Turn ignition off. Connect voltmeter between MAP sensor terminal "C" and ground. Turn ignition on. Voltmeter should read 4.5-5.5 volts. Check for same voltmeter reading at ECU terminal "C14." See Figure . Repair wiring harness as necessary.
- Turn ignition off. Check for continuity between MAP sensor terminal "A" and ECU terminal "D3." Repair wiring harness as necessary.
Factory Service Tools
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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.
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