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Home >> Honda >> 1989 >> Accord LX, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Tests W/Codes >> Trouble Code Tests >> Code 3 - Map Sensor

Code 3 - Map Sensor

  1. Turn ignition off. Remove No. 11 fuse in the under-hood relay box for 10 seconds to reset ECU. Start engine and observe "CHECK ENGINE" light. If light is off, problem is intermittent. Test drive and check again.
  2. If light is on, turn ignition off. Connect 3-wire test harness between MAP sensor and sensor harness. Turn ignition on. Measure voltage between Red (pos.) and Green (neg.) terminals. If reading is about 5 volts, go to step 4). If not, measure voltage between Red (pos.) terminal and ground. If voltage is still not 5 volts, go to step 3). If voltage is about 5 volts, repair open in Green/White wire between ECU terminal C14 and MAP sensor.
  3. Turn ignition off. Connect ECU test harness between ECU and ECU harness. See Figure . Measure voltage between terminal C15 (pos.) and C14 (neg.) with ignition on. If voltage reading is about 5 volts, repair open Red/White wire between ECU terminal C15 and MAP sensor. If voltage is not about 5 volts, substitute a known good ECU. If condition is rectified, replace original ECU.
  4. Measure voltage between White (pos.) and Green (neg.) terminals. If reading is not about 3 volts, replace MAP sensor or repair short in White/Blue wire between ECU terminal C11 and MAP sensor.
  5. If measured voltage is about 3 volts, turn ignition off. Connect ECU test harness between ECU and ECU connectors. Turn ignition on. Measure voltage between terminals C11 (pos.) and C14 (neg.). If there is not about 3 volts present, repair open White/Blue wire between ECU terminal C11 and MAP sensor.
  6. If there is about 3 volts present, substitute a known good ECU and recheck. If condition is rectified, replace original ECU.
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