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Home >> Acura >> 1990 >> Integra LS, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Code 5: Map Sensor
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Code 5: Map Sensor

NOTE: For wiring diagrams, see WIRING DIAGRAMS article. For vacuum diagrams, see VACUUM DIAGRAMS article.
  1. Turn ignition off. Remove hazard fuse at battery positive terminal for 10 seconds to reset ECU. Start engine and observe CHECK ENGINE and ECU LED lights. If lights are off, problem is intermittent. Check all electrical connections and vacuum hoses. Test drive and check again.
  2. If CHECK ENGINE light is on and LED indicates Code 5, turn ignition off. Connect hand-held vacuum pump/gauge to MAP sensor hose at throttle body. Apply vacuum. If vacuum holds, go to step 3). If vacuum does not hold, attach vacuum pump/gauge directly to MAP sensor. Apply vacuum. If vacuum does not hold, replace MAP sensor. If vacuum holds, check MAP sensor vacuum hose for cracks, splits or looseness. Repair as necessary.
  3. Check vacuum supply to MAP sensor connection on throttle body with engine running. If vacuum is not present, remove restriction or replace throttle body. If vacuum supply is okay, turn ignition off. Connect ECU test harness between ECU and ECU connector. Turn ignition on. Measure voltage between ECU terminals C11 (positive) and C14 (negative). See Figure .
  4. If voltage is not about 3 volts, replace MAP sensor. If voltage reading is about 3 volts, start engine and let idle. Recheck voltage between C11 and C14. If voltage is about 1 volt, substitute a known good ECU. If condition goes away, replace original ECU. If voltage is not as specified, replace MAP sensor.
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