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.
1992 Acura Legend Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Map Sensor
- MAP sensor is located inside control box on firewall. Unplug connector from MAP sensor. Turn ignition on. Measure voltage between Yellow/White and Green/White wires. If voltmeter does not indicate approximately 5 volts, repair wiring between MAP sensor and ECU. If wiring is okay, replace ECU. If voltmeter indicates approximately 5 volts, go to next step.
- Turn ignition off. Connect test harness between ECU and vehicle wire harness. Turn ignition on. Measure voltage between terminals D17 and D21. If voltage is not approximately as specified in MAP SENSOR VOLTAGE
table, check sensor output wire (Yellow/White) between MAP sensor and ECU. If wire is okay, replace MAP sensor.MAP SENSOR VOLTAGE
Vacuum Applied - In. Hg Volts 0 2.8-3.0 5 2.3-2.5 10 1.8-2.0 15 1.3-1.5 20 .8-1.0 25 .3-.5
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.